CA2019975C - Apparatus for producing stabilizing mixture - Google Patents
Apparatus for producing stabilizing mixtureInfo
- Publication number
- CA2019975C CA2019975C CA002019975A CA2019975A CA2019975C CA 2019975 C CA2019975 C CA 2019975C CA 002019975 A CA002019975 A CA 002019975A CA 2019975 A CA2019975 A CA 2019975A CA 2019975 C CA2019975 C CA 2019975C
- Authority
- CA
- Canada
- Prior art keywords
- stabilizing
- mixture
- bentonite
- pump
- discharge ports
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/50—Mixing liquids with solids
- B01F23/53—Mixing liquids with solids using driven stirrers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/20—Jet mixers, i.e. mixers using high-speed fluid streams
- B01F25/21—Jet mixers, i.e. mixers using high-speed fluid streams with submerged injectors, e.g. nozzles, for injecting high-pressure jets into a large volume or into mixing chambers
- B01F25/211—Jet mixers, i.e. mixers using high-speed fluid streams with submerged injectors, e.g. nozzles, for injecting high-pressure jets into a large volume or into mixing chambers the injectors being surrounded by guiding tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
- B01F25/3124—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characterised by the place of introduction of the main flow
- B01F25/31242—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characterised by the place of introduction of the main flow the main flow being injected in the central area of the venturi, creating an aspiration in the circumferential part of the conduit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/60—Pump mixers, i.e. mixing within a pump
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/25—Mixers with both stirrer and drive unit submerged in the material being mixed
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Accessories For Mixers (AREA)
Abstract
An apparatus for producing stabilizing mixture is diclosed. The apparatus is characterized in that an underwater pwmp provided with a suction port and at least one discharge port is disposed in a stirring water tank, that suction port and the discharge port are opened into the stirring water tank, and that the other end of a bentonite intake pipe having one end connected to a supply source for bentonite or the like is connected to the discharge port whereby the bentonite or the like can be sucked into the discharge port due to the negative pressure generated in the discharge port when the underwater pwmp is driven and vigorously mixed with water to produce a stabilizing mixture of uniform concentration.
Description
201997~
The present invention relates to an apparatus for producing stabilizing mixture in which a stabilizing mixture of uniform density used in excavation work can be produced readily in volume.
Aspects of the prior art and the present invention will be described by reference to the accompanying drawings, in which:
Fig. 1 is a front view in section of one embodiment of a stabilizing mixture producing apparatus according to the present invention.
Fig. 2 is a plan view of the same.
Figs. 3 and 4 are a front view in section and a plan view, respectively, of another embodiment.
Fig. 5 is a front view in section of a modification of the above embodiment.
Figs. 6 and 7 are front views in section of a conventional stabilizing mixture producing apparatus.
In order to smoothly carry out excavation work for well-digging, lower holes for piles and the like, the excavation work is carried out while pouring into an excavated hole a stabilizing mixture in slurry form produced by mixing stabilizing powder material such as bentonite and water.
As the apparatus for producing stabilizing mixture of the type as described, stabilizing mixture producing apparatuses B and C shown in Figs. 6 and 7 are known.
First, the stabilizing mixture producing apparatus B
shown in Fig. 6 will be described. The apparatus B is composed of a density regulating tank 60 interiorly provided with a stirring pump 61 and a mud discharging pump 62, and a mud preparing tank 63 interiorly provided with a mixer 64.
In this arrangement, first, bentonite 65 and water 66 are charged into the mud preparing tank 63, which are stirred by the mixer 64 to 201997~
produce stabilizing mixture or stabilizer 67.
The stabilizing mixture 67 is charged into the density regulating tank 60 and stirred by the stirring pump 61, and the stabili~ing mixture 67 formed into a uniform composition by said stirring can be charged into an excavated hole not shown through a mud transferring pipe 6~
The stabilizing mixture producing apparatus C shown in Fig. 7 will be described. The apparatus C is composed of a stirring and mud preparing pump 69 which is larger than the aforementioned stirring pump 61 and a mud discharging pump 62.
In this arrangement, bentonite 65 is charged into the density regulating tank 60 filled with water 66, which are stirred and prepared by the stirring and mud preparing pump 69. The stabili2ing mixture 67 produced into a unifonn composition by said stirrir~ and mud preparation is charged into an excavated hole not shown through the mud transferring pipe 68.
However, the abo~e-mentioned stabilizing mixture producing apparatuses B and C still have tasks to be solved as follows.
(1~ In the stabilizing mixture producing apparatus B sho~m in Fig. 6, an expensive mixer 64 is required, and therefore the apparatus B itself is costly. In addition, two processes are employed in which after the mud has been prepared by the mud preparing t~nk 63, the mud is regulated by the density regulating tank 60. Therefore, it takes a considerable time to produce the stabili7ing mixture 67 having a unifonm composition or no segregation.
The present invention relates to an apparatus for producing stabilizing mixture in which a stabilizing mixture of uniform density used in excavation work can be produced readily in volume.
Aspects of the prior art and the present invention will be described by reference to the accompanying drawings, in which:
Fig. 1 is a front view in section of one embodiment of a stabilizing mixture producing apparatus according to the present invention.
Fig. 2 is a plan view of the same.
Figs. 3 and 4 are a front view in section and a plan view, respectively, of another embodiment.
Fig. 5 is a front view in section of a modification of the above embodiment.
Figs. 6 and 7 are front views in section of a conventional stabilizing mixture producing apparatus.
In order to smoothly carry out excavation work for well-digging, lower holes for piles and the like, the excavation work is carried out while pouring into an excavated hole a stabilizing mixture in slurry form produced by mixing stabilizing powder material such as bentonite and water.
As the apparatus for producing stabilizing mixture of the type as described, stabilizing mixture producing apparatuses B and C shown in Figs. 6 and 7 are known.
First, the stabilizing mixture producing apparatus B
shown in Fig. 6 will be described. The apparatus B is composed of a density regulating tank 60 interiorly provided with a stirring pump 61 and a mud discharging pump 62, and a mud preparing tank 63 interiorly provided with a mixer 64.
In this arrangement, first, bentonite 65 and water 66 are charged into the mud preparing tank 63, which are stirred by the mixer 64 to 201997~
produce stabilizing mixture or stabilizer 67.
The stabilizing mixture 67 is charged into the density regulating tank 60 and stirred by the stirring pump 61, and the stabili~ing mixture 67 formed into a uniform composition by said stirring can be charged into an excavated hole not shown through a mud transferring pipe 6~
The stabilizing mixture producing apparatus C shown in Fig. 7 will be described. The apparatus C is composed of a stirring and mud preparing pump 69 which is larger than the aforementioned stirring pump 61 and a mud discharging pump 62.
In this arrangement, bentonite 65 is charged into the density regulating tank 60 filled with water 66, which are stirred and prepared by the stirring and mud preparing pump 69. The stabili2ing mixture 67 produced into a unifonn composition by said stirrir~ and mud preparation is charged into an excavated hole not shown through the mud transferring pipe 68.
However, the abo~e-mentioned stabilizing mixture producing apparatuses B and C still have tasks to be solved as follows.
(1~ In the stabilizing mixture producing apparatus B sho~m in Fig. 6, an expensive mixer 64 is required, and therefore the apparatus B itself is costly. In addition, two processes are employed in which after the mud has been prepared by the mud preparing t~nk 63, the mud is regulated by the density regulating tank 60. Therefore, it takes a considerable time to produce the stabili7ing mixture 67 having a unifonm composition or no segregation.
201997~
(2) On the other hand, in the stabilizing mixture producing apparatus C shown in Fig. 7, the bentonite is directly charged into the density regulating tank 60 without using the mud preparing tank 63 in advance, and thereafter, stirring and mud-preparation take place by use of only one stirring and mud preparing pump 69. Therefore, the bentonite 65 becomes dissolved incompletely so that a large quantity of bentonite 65 remains on the bottom of the density regulating tank 60, and particles of the bentonite 65 in the stabilizing mixture 67 become increased in size.
In summary, the present invention provides an apparatus for producing stabilizing mixture comprising a stirring water tank containing water therein, an underwater pump submerged in the water in the stirring water tank, the pump having a suction port and at least one discharge port, the suction port and the discharge ports being opened into the water in the stirring water tank, and a stabilizing material intake pipe having one end connected to a supply source for stabilizing material and the other end connected to the discharge port, whereby the stabilizing material can be sucked into the discharge port due to the negative pressure generated in the discharge port when the underwater pump is driven and vigorously mixed with water to produce a stabilizing mixture of uniform concentration.
With the above-described construction, the present invention has the following effects:
(1) In the present invention, when the unde~ater pump is actuate~ water is sucked from the suction port and water is discharged from the discharge ports. Negative pressure pro~oed by said discharge of water is utilized, that is, by the ejector effect, powdery stabilizing material is sucked into the discharge ports through an intake pipe for bentonite or the like and mixed with the discharge water along with air, after ~hich the thus mixed liquid can be discharged out of the discharge ports.
In the above-described operation, the bentonite or the like is readily dissolved into w~ter ~hen the fonner is mixed with the discharge water, and thereafter, it is discharged from the discharge ports and stirred throughout.
Accordingly, a large quan~ity of stabilizing mixture having a uniform concentration can be produced rapidly.
(2) Furtherm~re, since the stabilizing mixture discharged out of the discharge ports has air mixed therein, a powerful stirring flo~ can be formed within the stirring water tank, and the concentration of the stabilizing mixture ~n be ~ade further unifonm.
More particularly, in one aspect, the invention provides an apparatus for producing a stabilizing mixture for excavation work comprising:
(a) a stirring water tank containing water therein, (b) an underwater pump submerged in said water in said stirring water tank, said pump having a suction port formed on the bottom of a pump casing, a plurality of discharge ports and a mixture transfer port formed on the periphery of said pump casing in a circumferentially equidistant manner, said suction port and said discharge ports being opened into said water in said stirring water tank, (c) a stabilizing material intake pipe means having one end thereof connected to a supply source for stabilizing material and another end thereof connected to said discharge ports, said stabilizing material intake pipe means comprising (i) a single upstream material intake pipe having first and second ends, said first end thereof being connected to said supply source for stabilizing material, (ii) distributing means positioned on a central top portion of said underwater pump, said distributing means having an inlet thereof connected to said second end of said upstream material intake pipe and (iii) a plurality of downstream material intake pipes each having a first end connected to said distributing means and a second end connected to one of said discharge ports, and (d) a stabilizing mixture transfer pipe having a first end connected to an outlet of said mixture transfer port and a second end communicating with a place requiring said stabilizing mixture.
- 4a -201g975 The structure of the stabilizing mixture producing apparatus A
according to the present invention will be speci~ically described by reference to the embodiments shown in the drawings.
In figs. 1 and 2, reference numeral 10 designates a stirring or agitating water tank, which is interiorly filled with water W to a fixed height H.
An unden~ater pump 12 is stood upright within the stirring water tank 10 and above the central portion of a bottom plate 11.
The underwater pump 12 comprises, as shown in Fi$ 1, an impeller casing 13 which encases an impeller 13a rotatably therein, and a motor casing 14 arranged adjacent to said impeller casing 13 and housing therein a motor 14a connected to the impeller 13a to rotate the latter.
Re~erence numeral 15 designates a support base on which the underwater pump 12 is placed and supported.
201997~
With the above-described arrangement, the imp~ller casing 13 is provided in its front central bottom portion with a suction port 16 and in its outer peripheral edge with ~ plurality (three in this embodi~nt) of discharge ports 17aS 17b and 17c, as shown in Figs. 1 and 2.
Mounted on the discharge ports 17a~ 17b ~nd 17c are trumpet-like jet no zles 18d, 1 & and 1~f, respectively, to bring discharge openings l~g 18b and 18c to a position aw~y frolll the unde~ater pump 12.
As will be described hereinbelow, the discharge ports 17a, 17b and 17c are u~ed to discharge a st~bilizing mixture which is a mixture of bentonite~ air and w~ter intv the stirring ~at~r tank 10.
~ n this embodiment, bentonite is used as a powdery stabilizing mhteri~l.
The discharge direction of the discharge ports 17a, 17b and 17c extends in a tangential direction of the outer peripheral edge of the impeller 13a to pro~ide smooth discharge and transfer of the stabilizing mixture~
That is, as shown in Figs. 1 and 2, bottom ends of a plurality of lo~ær bentonite intake pipes 19a~ 19b and 19c are communicated with and connected to base ends of the discharge ports 17a, 17b and 17c, and upper ends of the lower bentonite intake pipes 19a, 19b and 19c are communicated with and connected to a distributing tube 20.
Communicated with and connected to the distributing tube 20 is one end of an upper bentonite intake pipe 19d, which in turn has the other end thereof inserted through a ~ilter 23 into bentonite 22 within a bentonite container 21 as a supply source for bentonite or the like provided externally of the stirring water tank 10.
The upper bentonite intake pipe 19d is provided in its midst with an opening and closing valve 19e. The valve 1~e is opened and closed to thereby asswme a bentonite mixing form suited to the conditions in the operation or construction site, that is, supplying of bentonite 22 exclusively, supplying of air exclusively, or supplying of neither bentonite 22 nor air.
As shown in Figs. 1 and 2, at one cor~er of the stirring water tank 10 is disposed a mud transfer pump 40 provided at its lower portion with a suction port. One end of ~ bend~ble mud transfer hose 42 is connected to a discharge port 41 provided at an upper portion of the pump 40, the other end of the hose 42 being inserted or extended into a desired excavation hole.
As sho~m in Fig. 1, an opening and closing valve 43 is provided on the hose 42.
Next, the manner of using the stabilizing mixture producing apparatus A having the above-described structure will be described with re~erence to Figs. 1 and 2.
First, the valve 19e provided in the midst of the upper bentonite intake pipe 19d is opened and the val~e 43 provided on the hose 42 is closed~ The underwater pwnp 12 and the mud transfer pump 40 are driven.
When the pumps 12 and 40 are driven, the impeller 13a within the impeller casing 13 rot~tes " ~hereby water is sucked from the suction port 16 into the impeller casing 13.
The water flown into the impeller casing 13 is discharged or jetted into the stirring water tank 10 through the discharge ports 17a, 17b and 17c and the jet no zles 18d, 1& ~nd 1~f from the casing 13.
In the discharging operation, negative pressure is generated within the discharge openings 18a, 18b and 1~c.
Due to this occurrence of negative pressure, that is, the ejector effect, powdery ben~onite 22 within the bentonite container 21 is jetted ~long ~ith air into the discharge ports 17a~ 17b and 17c through the bentonite intake pipe 19d~ the distributing tube 20 and the lower bentonit intdke pipes 19a, 1gb and 19c in said order and mixed with discharging ~ater flowing through the discharge ports 17a~ 17b and 17c to produce a mixed li~uid.
Ther~fter, the mixed liquid is po~rfully jetted into the stirring ~ter t~nk 10 frorn the jet no~les lad, 1fle and 18f.
In the above-described operation, the bentonite 22 is instantly dissolved with w~ter W when the former is mixed with ~later W, ~nd thereafter the bentQnite is discharged from the jet no~zles 1~d, 1ae and 1~f through the ~ischarge ports 17a~ 17b dnd 17c and stirred throughout ~ithin the stirring water t~nk 10.
Accordingly, a large ~uantity of stabilizing mixture having a uniform concentr~tion ~ithout any segregation can be produced rapidly.
In the present invention, since the stabilizing mixture discharged out of the discharge ports 17a, 17b and 17c is mixed with air, a powerful stirring flow can be form~d ~ithin the stirring water tank 10 to further promote rr~king of concentration of the stabili~ing mixture unifon~
Thereafter, when the valve 43 provided in the mud transfer hose 42 is opened, the stabilizing mixture produced in the above-described procedure is supplied rapidly and positively to the desired excavated holes or the like through the hose 42 from the discharge ports 41 of the pump 40.
Moreover, the above-described bentonite mixing and stirring action is continuously carried out simultaneously with the aforesaid mud transferring action. Therefore, the mud transferring action can be continuously carried out while uniformly maintaining the concentration of the stabilizing mixture to enhance the efficiency of the excavation ork.
~ hile in the above-described embodiment, the unden~ter pump 12 is merely provided with th~ impeller 1~a, it is to be noted that an output shaft of the motor 14a with the impeller 13a n~y be extended do~m~ard, and a cutter may be mounted on said extended pontion.
In this case5 mixing of the bentonite 22 and ~ter can be further promoted, particles of the bentonite 22 can be Further made finer5 and the stabili~ing mixture can be mhde further unifonm.
Next, a further ernbodiment of the stabili~ing mixture producing ~pp~ratus A o-F the present invention will be described with reference to Figs. 3 and 4.
The present embodiment is substantially characteri~ed by a structure which allows the underwater pump 12 to have not only the stirring function but also the rnud transferring function. Parts of the same construction as those of the stabilizing mixture producing apparatus A sho~Jn in Fi~s. 1 and 2 ar~ indic~ted by the same reference numerals.
In the present embodim~nt, as sho~ in Figs. 3 and 4, a discharge port 17c of the under~Jater pump 12 has its extr~l~ end bended upwardly, to which is connected a lo~r end of the rnud transfer pipe 24. One end of a bendable mud transfer hose 25 is connected to the upper end of the pipe 24, and the other end of the hose 25 is inserted into the desired excavated hole.
As shown in Fig. 1, ~n openin~ and closing valve 26 is pnovided ~t the upper portion of the rnud transfer pipe 24.
Due to the ~bove-described structure~ the st~bili~ing mixture having a uniform concentration can be produced by action, similar to the aforernentioned embodirnent. In addition~ the bentonite mixing and stirring action is carried out continuously simultaneously with the mud transferring action. Namely, the mud trdnsferring action can be continuously carried out while ~intaining the concentration of the st~bilizing mixture uniforr,l to improve the efficiencey of excav~ting ~rk.
Furthennore, in the present en~odiir~nt~ since ch~rging of ben~onite 223 l~ud-preparation~ stirring and n~ud transferring c~n be c~rried out by use of a single under~later pump 12, the st~bilizing mixture p~ducing apparatus A can be ~nufactured inexpensively.
~ ext, a modific~tion o~ the above described embodiment will be described with reference to Fig. 5.
Thi~ r~dification is characterized in that a supply source for bentonite or the like rnay be residual b~ntonite which floats in the upper part of an excavated hole~ and such floating residual bentonite can ~e t~nsferred from an old excavated hole to ~ new excavated hole.
Th~t iS5 in Fig. 5, t~ference nu~l~rals 30 ~nd 31 designate ne~/ and old excavated holes~ respectively, a foundation 33 of concrete is placed ~;thin the old exc~vated hole 31, and th~ residual or excessive bentonite 22 floats thereabove.
On the other hand, no foundation is placed in the new exc~vated hole 3Q
In the stabili~ing nlixtur~ producing apparatus A according to the present embodiment, one end of the lower bentonit intake pipe 19c is inserted into the bentonite 22 within the old excavated holè 31, and one end of the mud transfel hose Z5 is inserted into the new excavated hole 30.
With the above-described structure, the negative pressure produced by the underwater pUlllp 12 can be utili~ed similarly to the aforementioned embodiments to suck the bentonite 22 from the old excavated hole 31 ~nd the bentonite 22 can be mixed and stirred with ~later efficiently and uniformly within the stirring water t~nk 10 to produce stabilizing mixture.
The st~bilizing mixture can be continuously supplied to the new excavated hole 30. And, the thus obtained stabili~ing mixture can be coated on the inner surf~ces of the neiJ exc~vated hole 30 to thereby positively pr~vent the exc~vat~d ~alls from being collapsed.
In Fig. 5, reference nurr~ral 32 designates a concrete charging d~vice.
W'nile in the enlbodinlents sho~A~n in Figs. 1 to 5, the bentonite 22 h~s been use~ as a po~dery stabili~ing n~te~ial to be rnixed into ~A~ter, it is to be noted th~t the st~bili~ing mixture pro~ucing app~r~tus according to the present invention can use other materidl SS for example, such as cenlent~ hich can be mixed with ~ ter to thereby produce ~ slurry.
(2) On the other hand, in the stabilizing mixture producing apparatus C shown in Fig. 7, the bentonite is directly charged into the density regulating tank 60 without using the mud preparing tank 63 in advance, and thereafter, stirring and mud-preparation take place by use of only one stirring and mud preparing pump 69. Therefore, the bentonite 65 becomes dissolved incompletely so that a large quantity of bentonite 65 remains on the bottom of the density regulating tank 60, and particles of the bentonite 65 in the stabilizing mixture 67 become increased in size.
In summary, the present invention provides an apparatus for producing stabilizing mixture comprising a stirring water tank containing water therein, an underwater pump submerged in the water in the stirring water tank, the pump having a suction port and at least one discharge port, the suction port and the discharge ports being opened into the water in the stirring water tank, and a stabilizing material intake pipe having one end connected to a supply source for stabilizing material and the other end connected to the discharge port, whereby the stabilizing material can be sucked into the discharge port due to the negative pressure generated in the discharge port when the underwater pump is driven and vigorously mixed with water to produce a stabilizing mixture of uniform concentration.
With the above-described construction, the present invention has the following effects:
(1) In the present invention, when the unde~ater pump is actuate~ water is sucked from the suction port and water is discharged from the discharge ports. Negative pressure pro~oed by said discharge of water is utilized, that is, by the ejector effect, powdery stabilizing material is sucked into the discharge ports through an intake pipe for bentonite or the like and mixed with the discharge water along with air, after ~hich the thus mixed liquid can be discharged out of the discharge ports.
In the above-described operation, the bentonite or the like is readily dissolved into w~ter ~hen the fonner is mixed with the discharge water, and thereafter, it is discharged from the discharge ports and stirred throughout.
Accordingly, a large quan~ity of stabilizing mixture having a uniform concentration can be produced rapidly.
(2) Furtherm~re, since the stabilizing mixture discharged out of the discharge ports has air mixed therein, a powerful stirring flo~ can be formed within the stirring water tank, and the concentration of the stabilizing mixture ~n be ~ade further unifonm.
More particularly, in one aspect, the invention provides an apparatus for producing a stabilizing mixture for excavation work comprising:
(a) a stirring water tank containing water therein, (b) an underwater pump submerged in said water in said stirring water tank, said pump having a suction port formed on the bottom of a pump casing, a plurality of discharge ports and a mixture transfer port formed on the periphery of said pump casing in a circumferentially equidistant manner, said suction port and said discharge ports being opened into said water in said stirring water tank, (c) a stabilizing material intake pipe means having one end thereof connected to a supply source for stabilizing material and another end thereof connected to said discharge ports, said stabilizing material intake pipe means comprising (i) a single upstream material intake pipe having first and second ends, said first end thereof being connected to said supply source for stabilizing material, (ii) distributing means positioned on a central top portion of said underwater pump, said distributing means having an inlet thereof connected to said second end of said upstream material intake pipe and (iii) a plurality of downstream material intake pipes each having a first end connected to said distributing means and a second end connected to one of said discharge ports, and (d) a stabilizing mixture transfer pipe having a first end connected to an outlet of said mixture transfer port and a second end communicating with a place requiring said stabilizing mixture.
- 4a -201g975 The structure of the stabilizing mixture producing apparatus A
according to the present invention will be speci~ically described by reference to the embodiments shown in the drawings.
In figs. 1 and 2, reference numeral 10 designates a stirring or agitating water tank, which is interiorly filled with water W to a fixed height H.
An unden~ater pump 12 is stood upright within the stirring water tank 10 and above the central portion of a bottom plate 11.
The underwater pump 12 comprises, as shown in Fi$ 1, an impeller casing 13 which encases an impeller 13a rotatably therein, and a motor casing 14 arranged adjacent to said impeller casing 13 and housing therein a motor 14a connected to the impeller 13a to rotate the latter.
Re~erence numeral 15 designates a support base on which the underwater pump 12 is placed and supported.
201997~
With the above-described arrangement, the imp~ller casing 13 is provided in its front central bottom portion with a suction port 16 and in its outer peripheral edge with ~ plurality (three in this embodi~nt) of discharge ports 17aS 17b and 17c, as shown in Figs. 1 and 2.
Mounted on the discharge ports 17a~ 17b ~nd 17c are trumpet-like jet no zles 18d, 1 & and 1~f, respectively, to bring discharge openings l~g 18b and 18c to a position aw~y frolll the unde~ater pump 12.
As will be described hereinbelow, the discharge ports 17a, 17b and 17c are u~ed to discharge a st~bilizing mixture which is a mixture of bentonite~ air and w~ter intv the stirring ~at~r tank 10.
~ n this embodiment, bentonite is used as a powdery stabilizing mhteri~l.
The discharge direction of the discharge ports 17a, 17b and 17c extends in a tangential direction of the outer peripheral edge of the impeller 13a to pro~ide smooth discharge and transfer of the stabilizing mixture~
That is, as shown in Figs. 1 and 2, bottom ends of a plurality of lo~ær bentonite intake pipes 19a~ 19b and 19c are communicated with and connected to base ends of the discharge ports 17a, 17b and 17c, and upper ends of the lower bentonite intake pipes 19a, 19b and 19c are communicated with and connected to a distributing tube 20.
Communicated with and connected to the distributing tube 20 is one end of an upper bentonite intake pipe 19d, which in turn has the other end thereof inserted through a ~ilter 23 into bentonite 22 within a bentonite container 21 as a supply source for bentonite or the like provided externally of the stirring water tank 10.
The upper bentonite intake pipe 19d is provided in its midst with an opening and closing valve 19e. The valve 1~e is opened and closed to thereby asswme a bentonite mixing form suited to the conditions in the operation or construction site, that is, supplying of bentonite 22 exclusively, supplying of air exclusively, or supplying of neither bentonite 22 nor air.
As shown in Figs. 1 and 2, at one cor~er of the stirring water tank 10 is disposed a mud transfer pump 40 provided at its lower portion with a suction port. One end of ~ bend~ble mud transfer hose 42 is connected to a discharge port 41 provided at an upper portion of the pump 40, the other end of the hose 42 being inserted or extended into a desired excavation hole.
As sho~m in Fig. 1, an opening and closing valve 43 is provided on the hose 42.
Next, the manner of using the stabilizing mixture producing apparatus A having the above-described structure will be described with re~erence to Figs. 1 and 2.
First, the valve 19e provided in the midst of the upper bentonite intake pipe 19d is opened and the val~e 43 provided on the hose 42 is closed~ The underwater pwnp 12 and the mud transfer pump 40 are driven.
When the pumps 12 and 40 are driven, the impeller 13a within the impeller casing 13 rot~tes " ~hereby water is sucked from the suction port 16 into the impeller casing 13.
The water flown into the impeller casing 13 is discharged or jetted into the stirring water tank 10 through the discharge ports 17a, 17b and 17c and the jet no zles 18d, 1& ~nd 1~f from the casing 13.
In the discharging operation, negative pressure is generated within the discharge openings 18a, 18b and 1~c.
Due to this occurrence of negative pressure, that is, the ejector effect, powdery ben~onite 22 within the bentonite container 21 is jetted ~long ~ith air into the discharge ports 17a~ 17b and 17c through the bentonite intake pipe 19d~ the distributing tube 20 and the lower bentonit intdke pipes 19a, 1gb and 19c in said order and mixed with discharging ~ater flowing through the discharge ports 17a~ 17b and 17c to produce a mixed li~uid.
Ther~fter, the mixed liquid is po~rfully jetted into the stirring ~ter t~nk 10 frorn the jet no~les lad, 1fle and 18f.
In the above-described operation, the bentonite 22 is instantly dissolved with w~ter W when the former is mixed with ~later W, ~nd thereafter the bentQnite is discharged from the jet no~zles 1~d, 1ae and 1~f through the ~ischarge ports 17a~ 17b dnd 17c and stirred throughout ~ithin the stirring water t~nk 10.
Accordingly, a large ~uantity of stabilizing mixture having a uniform concentr~tion ~ithout any segregation can be produced rapidly.
In the present invention, since the stabilizing mixture discharged out of the discharge ports 17a, 17b and 17c is mixed with air, a powerful stirring flow can be form~d ~ithin the stirring water tank 10 to further promote rr~king of concentration of the stabili~ing mixture unifon~
Thereafter, when the valve 43 provided in the mud transfer hose 42 is opened, the stabilizing mixture produced in the above-described procedure is supplied rapidly and positively to the desired excavated holes or the like through the hose 42 from the discharge ports 41 of the pump 40.
Moreover, the above-described bentonite mixing and stirring action is continuously carried out simultaneously with the aforesaid mud transferring action. Therefore, the mud transferring action can be continuously carried out while uniformly maintaining the concentration of the stabilizing mixture to enhance the efficiency of the excavation ork.
~ hile in the above-described embodiment, the unden~ter pump 12 is merely provided with th~ impeller 1~a, it is to be noted that an output shaft of the motor 14a with the impeller 13a n~y be extended do~m~ard, and a cutter may be mounted on said extended pontion.
In this case5 mixing of the bentonite 22 and ~ter can be further promoted, particles of the bentonite 22 can be Further made finer5 and the stabili~ing mixture can be mhde further unifonm.
Next, a further ernbodiment of the stabili~ing mixture producing ~pp~ratus A o-F the present invention will be described with reference to Figs. 3 and 4.
The present embodiment is substantially characteri~ed by a structure which allows the underwater pump 12 to have not only the stirring function but also the rnud transferring function. Parts of the same construction as those of the stabilizing mixture producing apparatus A sho~Jn in Fi~s. 1 and 2 ar~ indic~ted by the same reference numerals.
In the present embodim~nt, as sho~ in Figs. 3 and 4, a discharge port 17c of the under~Jater pump 12 has its extr~l~ end bended upwardly, to which is connected a lo~r end of the rnud transfer pipe 24. One end of a bendable mud transfer hose 25 is connected to the upper end of the pipe 24, and the other end of the hose 25 is inserted into the desired excavated hole.
As shown in Fig. 1, ~n openin~ and closing valve 26 is pnovided ~t the upper portion of the rnud transfer pipe 24.
Due to the ~bove-described structure~ the st~bili~ing mixture having a uniform concentration can be produced by action, similar to the aforernentioned embodirnent. In addition~ the bentonite mixing and stirring action is carried out continuously simultaneously with the mud transferring action. Namely, the mud trdnsferring action can be continuously carried out while ~intaining the concentration of the st~bilizing mixture uniforr,l to improve the efficiencey of excav~ting ~rk.
Furthennore, in the present en~odiir~nt~ since ch~rging of ben~onite 223 l~ud-preparation~ stirring and n~ud transferring c~n be c~rried out by use of a single under~later pump 12, the st~bilizing mixture p~ducing apparatus A can be ~nufactured inexpensively.
~ ext, a modific~tion o~ the above described embodiment will be described with reference to Fig. 5.
Thi~ r~dification is characterized in that a supply source for bentonite or the like rnay be residual b~ntonite which floats in the upper part of an excavated hole~ and such floating residual bentonite can ~e t~nsferred from an old excavated hole to ~ new excavated hole.
Th~t iS5 in Fig. 5, t~ference nu~l~rals 30 ~nd 31 designate ne~/ and old excavated holes~ respectively, a foundation 33 of concrete is placed ~;thin the old exc~vated hole 31, and th~ residual or excessive bentonite 22 floats thereabove.
On the other hand, no foundation is placed in the new exc~vated hole 3Q
In the stabili~ing nlixtur~ producing apparatus A according to the present embodiment, one end of the lower bentonit intake pipe 19c is inserted into the bentonite 22 within the old excavated holè 31, and one end of the mud transfel hose Z5 is inserted into the new excavated hole 30.
With the above-described structure, the negative pressure produced by the underwater pUlllp 12 can be utili~ed similarly to the aforementioned embodiments to suck the bentonite 22 from the old excavated hole 31 ~nd the bentonite 22 can be mixed and stirred with ~later efficiently and uniformly within the stirring water t~nk 10 to produce stabilizing mixture.
The st~bilizing mixture can be continuously supplied to the new excavated hole 30. And, the thus obtained stabili~ing mixture can be coated on the inner surf~ces of the neiJ exc~vated hole 30 to thereby positively pr~vent the exc~vat~d ~alls from being collapsed.
In Fig. 5, reference nurr~ral 32 designates a concrete charging d~vice.
W'nile in the enlbodinlents sho~A~n in Figs. 1 to 5, the bentonite 22 h~s been use~ as a po~dery stabili~ing n~te~ial to be rnixed into ~A~ter, it is to be noted th~t the st~bili~ing mixture pro~ucing app~r~tus according to the present invention can use other materidl SS for example, such as cenlent~ hich can be mixed with ~ ter to thereby produce ~ slurry.
Claims
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An apparatus for producing a stabilizing mixture for excavation work comprising:
(a) a stirring water tank containing water therein, (b) an underwater pump submerged in said water in said stirring water tank, said pump having a suction port formed on the bottom of a pump casing, a plurality of discharge ports and a mixture transfer port formed on the periphery of said pump casing in a circumferentially equidistant manner, said suction port and said discharge ports being opened into said water in said stirring water tank, (c) a stabilizing material intake pipe means having one end thereof connected to a supply source for stabilizing material and another end thereof connected to said discharge ports, said stabilizing material intake pipe means comprising (i) a single upstream material intake pipe having first and second ends, said first end thereof being connected to said supply source for stabilizing material, (ii) distributing means positioned on a central top portion of said underwater pump, said distributing means having an inlet thereof connected to said second end of said upstream material intake pipe and (iii) a plurality of downstream material intake pipes each having a first end connected to said distributing means and a second end connected to one of said discharge ports, and (d) a stabilizing mixture transfer pipe having a first end connected to an outlet of said mixture transfer port and a second end communicating with a place requiring said stabilizing mixture.
(a) a stirring water tank containing water therein, (b) an underwater pump submerged in said water in said stirring water tank, said pump having a suction port formed on the bottom of a pump casing, a plurality of discharge ports and a mixture transfer port formed on the periphery of said pump casing in a circumferentially equidistant manner, said suction port and said discharge ports being opened into said water in said stirring water tank, (c) a stabilizing material intake pipe means having one end thereof connected to a supply source for stabilizing material and another end thereof connected to said discharge ports, said stabilizing material intake pipe means comprising (i) a single upstream material intake pipe having first and second ends, said first end thereof being connected to said supply source for stabilizing material, (ii) distributing means positioned on a central top portion of said underwater pump, said distributing means having an inlet thereof connected to said second end of said upstream material intake pipe and (iii) a plurality of downstream material intake pipes each having a first end connected to said distributing means and a second end connected to one of said discharge ports, and (d) a stabilizing mixture transfer pipe having a first end connected to an outlet of said mixture transfer port and a second end communicating with a place requiring said stabilizing mixture.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1019087A JP2531774B2 (en) | 1989-01-27 | 1989-01-27 | Stabilizer manufacturing equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2019975A1 CA2019975A1 (en) | 1991-12-27 |
| CA2019975C true CA2019975C (en) | 1996-07-23 |
Family
ID=11989674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002019975A Expired - Lifetime CA2019975C (en) | 1989-01-27 | 1990-06-27 | Apparatus for producing stabilizing mixture |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0502218A1 (en) |
| JP (1) | JP2531774B2 (en) |
| CA (1) | CA2019975C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9508257D0 (en) * | 1995-04-24 | 1995-06-14 | British Nuclear Fuels Plc | Removing liquids from tanks |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1139318B (en) * | 1959-04-16 | 1962-11-08 | Andreas Weiss | Agitator for mixing water or liquid manure with manure |
| US4645603A (en) * | 1977-11-09 | 1987-02-24 | Frankl Gerald P | Liquid aeration device and method |
| GB2095570B (en) * | 1981-03-31 | 1984-10-17 | British Nuclear Fuels Ltd | An improved apparatus for agitating the contents of storage tanks |
| DE3321143A1 (en) * | 1983-06-10 | 1984-12-13 | Anton 8206 Bruckmühl Humpel | Device for treating liquids, in particular liquid manure, preferably situated in containers, and distribution device for this purpose |
| DE3407370A1 (en) * | 1984-02-29 | 1985-08-29 | Kurt Leistner | Apparatus for introducing solid, liquid or gaseous treatment agent/nutrient into water, waste water |
| DE3417039A1 (en) * | 1984-02-29 | 1985-11-14 | Kurt Leistner | Apparatus for introducing a solid, liquid or gaseous treatment substance/nutrient into water, waste water |
| DE3621903A1 (en) * | 1986-06-30 | 1988-01-07 | Alois Maier | Agitator (stirrer) |
-
1989
- 1989-01-27 JP JP1019087A patent/JP2531774B2/en not_active Expired - Lifetime
-
1990
- 1990-06-27 EP EP90401844A patent/EP0502218A1/en not_active Withdrawn
- 1990-06-27 CA CA002019975A patent/CA2019975C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2019975A1 (en) | 1991-12-27 |
| EP0502218A1 (en) | 1992-09-09 |
| JP2531774B2 (en) | 1996-09-04 |
| JPH02200994A (en) | 1990-08-09 |
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| Date | Code | Title | Description |
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| EEER | Examination request | ||
| MKEX | Expiry |