DE1802157A1 - Method and suction dredging device for extracting sand - Google Patents

Description

Dipl.-Ing. C. Wallach 1 7 6 ^τ 4!

N.V, Ingenieursbureau voor Systeme en Qetrooien "Spanstaal * in Rotterdam, the Netherlands

"Method and suction dredger device for extracting τοη sand."

You invention relates to a method for Win τοη sand, with the help of a suction excavator device one arranged between a suction pipe and a discharge pipe Pump, in which the suction pipe is inserted a long way into the ground, the invention also relates to a suction dredging device for sucking up τοη dredged material, for example sand, comprising a suction tube with an inner tube, one at the lower end of the inner tube telescopically cooperating with the same

Sliding tube, one surrounding the inner tube and the sliding tube

with jacket and with propellants to propel the sliding pipe The sliding tube has at least one suction mouth at the lower end for sucking up the dredged material

In particular, the invention relates to the extraction of τοη sand that is located below a layer of another type of soil, such as son or loam, when the sand to be extracted is below a Tonsohient, you have to start with the Suction pipe penetrate through the Eonschioht, beTOr the sand can be absorbed. That through the Tomohioht Hindur oh lead β η of the sliding tube is heavy and each time requires a substantial amount of time to produce The task is to reduce this improduced time to a small fraction of the total working time. The «becomes thereby

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achieved that during a Untebreohtang of the suction process see β the suction pipe is left in the S.and, Auf & it® @ Weis becomes di® Number of improductive periods and thus dit geaaste improductife and di @ overall «less productive. Time heavily tex reduced« Di® mentioned interruptions dee laugprosessee know, for example with pauses for the people performing this procedure or maintenance work on the pump or outside filing the suction dredger are related.

If, with the conventional method, stagnation occurs in the sand discharge on the pressure side of the belt pump, for example due to the fact that the rams collect and convey the sanitary equipment obtained, the suction dredger device is not present in good time, the longer stagnation that is to be expected will be the Saugproseae dingeatelltp the suction tube is pulled out of the ground, waa during the subsequent starting of the Saugproatsees a ieiproduktiv © period unit aioh brings "at too erwartemdeji less prolonged stagnation of for example 30 linuten or 1 hour, however, it is common to kontiaeieren the process and aufgesaugtfn Saai overboard in the ready® auegenuteteia feil äer suction pit so, eohötten, where the same on and / or la elae, often thick layer of sun and moor, which gets the ungerikrtea sand ”, this fibtr board poured sana * is lost "The invention also sohafft one w © iterentwiekelt @ s traverse" n _y in which this ferluet clay sand i adureh, does not appear, äaee · a © St & gaaiioa the Sandabfun? aa least Braokeeit © dtr Pamp · the Saagprocessesa interrupted while the pipe in sand · left

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In general, there is a fear that the suction pipe will be calibrated in the booths stuck · In the case of the process of the invention because the suction tube is irrevocably stuck in the ground. she The invention is based on the knowledge that the stuck suction pipe is not a disadvantage, since it can suck itself away. For this purpose, when the Suction process in the area of the lower end of the suction tube created cavity increasing in circumference · the above dfcses The sand that is present in the cavity then fluidizes because it is not adequately supported on the lower side.

This cavity can be in the same well-known smock as in the sand in front of the suction mouth of the suction tube acting spray lances or cutting tools. To start the suction process very quickly after an interruption, For example, to bring production up to speed within 5 minutes, the invention also improves a suction dredging device for sucking up dredged material, for example sand, comprising a suction pipe with an inner pipe, a sliding pipe which cooperates telescopically with the same at the lower end of the inner pipe, the inner pipe and the sliding pipe enveloping dumbbell and propellant for driving the sliding tube, the sliding tube around the lower end at least one suction mouth for sucking up dredged material by placing the lower end of the sliding tube free outside the casing that is stuck in the ground can be pushed out and withdrawn again into the same. Start up again after an interruption of the suction process is reliable if, when the suction process is interrupted, pressurized water enters the lower end of the

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Suction pipe s is guided, resulting in the suction of the pump at the lower end of the suction pipe »» is gradually lifted · The last mentioned suction baggeriohtmng after the invention iet low-cost by using τοη Haeenamen even further developed, making them swecknäseiger while passing * the suction tube through the sonsehioht, during the normal suction process and during the after an interruption, in turn, starting the suction process is working·

The above and further features of the invention are illustrated in the following description with reference to a drawing explained «

In the drawing, put schematisoh dart

Jig. 1 is a broken side view of the dee lower member of the suction tube of a preferred embodiment a suction excavator device

Jig. 2 and 3 skis of the state during Hindu driving this ear through a son's throat.

4 shows a sketch of the state during the Legs of the grate

Jig. 5 a sketch of the state during the LSsena of the stuck suction pipe

In fig. 1 sound to a suction pipe 33 is just that The lower link is shown »which can be swiveled in a known manner on a Q-excavator that can be swiveled on a crane suspended upper section of this suction tube is attached «Das The lower link of the suction tube 33 consists essentially of a via the upper link to an® ^ E. 10 i, below the

· »5 ■"

Water level arranged sandpuape connected inner pipe 34, a jacket 35 which envelops the inner tube 34 and is rigidly attached to the same, and an aohsial ver in the inner tube 34. Slidably arranged, by means of a number, for example three, hydraulic cylinders 36 driven, long suspension tube 37 »the one at the bottom. End of a drill bit 42 τοη larger diameter. knife owns. This Rohr3tück 42 carries a suction basket 38, which forms the grid to hold up large objects, such as stones, coming in the ground and which extends across the Suction pipe 33 has extending front grille 44 and a cylinder grille 41 adjoining the same. The outside diameter of the cylinder grid 41 corresponds to the inside diameter of the somewhat narrowed jacket end 39 of the jacket so that during the drawing-in of the sole tube 37 to in the jacket end 39 the lower edge 40 of this jacket end 39 scrapes off any large objects that may adhere to the cylinder grid 41. The cylinder grille 41 closes from the inside to the lower end of the ear piece 42, the one has the same diameter as the cylinder lattice 41 and the end facing away from the cylinder lattice 41 extended with a guide tube 43 of the same Durohmesser is. This guide tube 43 and thus the pipe section 42 is attached to the circumference by means of radial tabs 53 Rope 54 of the sliding tube 37 attached to a smaller diameter. This skin 54 has a radial at the lower end Collar 55 'of an annular gap 52 between itself and the drill bit 42 free. The guide tube 43 fits pushing into the jacket end 39. Between the lower

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fells 54 desJSeihiebfcohree 37 and the guide tube 43 is present in the cylindrical tree 45, the aa upper JSnä «with the cylindrical tree 46 between the jacket 35 on the one hand and the sight pipe 37 and the inner pipe 34 on the other hand, which latter tree is connected to one Brackish water pump connected to supply 47 from Sruekwaseer, the pressure of which can be regulated _? is connected. The pressurized water can flow from the tree 46 through the gap 52 into the drill bit 42 »

! The jacket 35 has a shell part 48 of larger size cross section for receiving the Zylinlere 36® order on "- suction tube 33 to keep as lean at the bottom of the inner tube 34 relatively short and the Sohiatorohr 37" particularly long, m, for example 20, is selected, while the length of the sliding pipe is only 4 m »

For guiding the long sliding block 37 in relation on .the jacket 35 guide backs 49 are provided »

It is noted ₉ that the jacket end 39 of the sangrolire 33 with a view of the inlet has a sharp inner aunt 40 while, due to the wide drill hole 42 at the end of the slider ear 37 and the ring foxmigea gap 52 for admitting the pressurized water, the resistance at up to because »slide pipe 37 currents are low®

This is a follow of induced by the © instromenden pressure water toruafSrmigen Supports Wi © bels 60th well is the Stromungebild in Iah © d © r üaterkante 40 not 90 good, "but this is not laehteil _r because the Strömungsquersohnitt there relatively large i @ t _e

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While the suction tube 33 is inserted into the hard clay tube 50 of the suction tube (see Pig. 2) the supply of pressure water 47 is shut off »the slide tube 37 with the suction basket 38 is kept pushed in and the jacket end 39 is printed into the clay while by means of the sand pump draws in a lot of water. A large piece of clay 51 penetrates the lower end of the suction tube 33. The arrows 18 of the pig. 2 and 3 show how the water flow flows downwards along the casing end 39, deflects around the lower edge 40 and finally flows upwards between the disk 51 and the inner wall of the casing end 39 into the suction strainer 38. By continuously letting the lower edge 40 follow the floor 25 of the scrubbed cylindrical cavity, the gap width in the area of the lower edge 40 and the floor 25 is very small, and thus the local speed of the water flow is very large, so that this flow takes the clay out of the solid Breach below the lower edge quickly rubs off. In addition, the large piece of clay 51 is abraded on its side so that the diameter of the same becomes smaller than the inner diameter of the jacket end 39.Then the piece of clay 51 is compressed by exerting a downward pressure on it with the suction cup 38 ( see Pig. 3).

The flow velocity between the compressed piece of clay 51 and the jacket end 39 is then greater, so that consequently the attack on the outer surface of this Stuckes tone 51 is bigger. Furthermore, the connection of the Piece of sound 51 is greatly reduced during compression.

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Advantage jelly is the lower edge 40 continuously deeper into the hard breach introduced »ao daes the flow velocity around this lower edge 40 remains large · Furthermore, dme in the Sheath end compact piece of son continuously, or compressed with short gaps · This is how the Einbresoheeit and thus the inproductive time are considerably too short.

When the jacket end 39 is in the sand below the lonsohioht 50, the location of the suction cup 36 is in the Jacket end 39 as a function of the clay column, which is located in the breach above the lower edge 40 "and as a function of the pressure of the water flowing through the gap 52 the suction basket 33 is supplied, regulated. That way is the concentration of sand in the absorbed suspension increases rules·

If too many large objects are piled up below the suction basket 38 in the casing end 39, the suction basket will be 38 driven close to the outside, so that sand then flows through the Cylinder grid 41 can enter (see Fig. 4). As a result, the suction pressure on the front grille 44 is greatly reduced and

large objects, also as a result of the suction tube movements, fall off the front grille 44 »

If unexpectedly, for example after the sudden fall of an unexpectedly high sand wall or a clumsy one Maneuver, the suction pipe 33 in the jacket 35 surrounding itself Set sand 57 is stuck, the slide pipe 37 is continuously against the calibration located below the suction pipe 33, itself Set sand is moved up and down, while a lot of pressurized water is continuously fed through the gap 52 and sucked by means of the sand pump. The sliding tube 37 with the basket 38 engages thus this settled sand below the suction pipe 33.

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. The slide tube 37 is eo with each up and down stroke can be pushed a little further near the outside until its ν maximally extended position is reached. With one stroke length the cylinder 36 is 4 m, the suction head can e.g. 2 m can be pushed close to the outside and 2 m inwards

When the sliding tube 37 with the suction basket 38 is pushed in, a cavity is created underneath the suction tube 56 in the still settled sand 57. The sand present above this cavity 56, which is neither from the stuck Jacket 35 is still supported by the suction strainer 38, falls near the bottom into the cavity and is in the following Extension stroke of the sliding tube 37 sucked up. The larger cavity 58 then formed will become larger and larger in this way, until all of the sand 57 is fluidized within the dashed line 59 in the region of the suction pipe 33. The suction pipe 33 can then be moved again according to your wish *

Summarizing the above, it can be said that this suction pipe 33 is particularly special thanks to the sliding sliding pipe 37 is suitable for

to penetrate quickly through a set tone technology,

a suspension with tiner set hohtn Absorb concentration of sand,

Sand to be won at tintr dredging site, at dtr large «sttine occur

and calibrate yourself to Ι3β · η, if «β calibrate should.

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HindurohfOhren to the intake manifold less often fonsohieht by dia brauohen au ₉ is bent at an interruption de · suction process dan suction tube not au "the ground .; but left in the same so that when the suction process is started again, the suction tube only needs to be sucked loose, for example in the manner described below. You don't just proceed like this when the suction process is interrupted to take a break or two. Carry out the necessary maintenance work but also in the areas that the removal of the sand stagnates. This prevents "a lot of sand from being flooded onto the fönsohioht" which can no longer be extracted there, because he partly deals with the sdiwi-jaianäoa on the son's face Mud mixed and because he even got to the rope up in the broken sonsohioht invades.

During the setting of the suction process Water through the annular gap 52 into the drill bit 42 of the sliding tube 37 is pressed and the suction effect is canceled at the lower end of the sliding tube 37, in which in a higher lying rope of the suction pipe or a smuggling · ». valve water is allowed into the suction pipe. In this way, water is essentially passed through from gap 52 the sliding tube 37 is guided upwards from behind, while d®r Sand is held below the gap 52. That! Fix of sand in the rope located above the gap 52 of the suction pipe is excluded. Well sit down , the sand around the mantle 35 "in the lower volume of the mantle and firmly in the lower band of the bootleg tube, but the same can

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easily fluidized when the suction bogus is started up again will.

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Claims (1)

AHS PBIIE O HB 1 · Method of extracting τοη sand, with the help a suction dredger with one between one in which Suction pipe and a discharge pipe arranged pump, / because «suction pipe is introduced a large piece into the ground» characterized that during an interruption the suction processes the suction pipe (33) is left in the sand (10). 2, "Method according to claim 1, characterized in that during a stagnation of the sand discharge on the pressure side of the pump, the suction process is interrupted while the suction pipe (33) is left in the sand (10). 3 · ancestors according to claim 1 or 2 daduroh characterized that when the suction process is interrupted, pressurized water is guided into the lower end of the suction tube (33), while the suction of the pump on the lower end of the The suction tube (33) is gradually lifted · 4 · Method according to one of the preceding Claims, carried out with the aid of a suction excavator device, comprising a suction pipe (33) with an inner pipe (34), a sliding pipe (37) which cooperates telescopically with the same at the lower end of the inner pipe (34), the inner pipe (34) and the sliding pipe (37) ) enveloping dumbbell (35) and with Xreibmittel (36) for driving the sliding tube (37) »whereby the sliding tube (37) at the lower end has at least one suction mouth for sucking up dredged material, characterized in that when there is an interruption, the suction process is again started lower end of the sliding tube (37) 909824/0899 between a freely exposed outside of the jacket (35) Position and a position retracted within the jacket (35) is shifted 5. The method according to claim 4, characterized in that the sliding tube (37) is repeatedly pushed back and forth will. 6. Saugbaggervorriehtung for sucking up τοη dredged material, for example sand, comprising a suction pipe (33) with an inner tube (34) telescopically cooperating with the same sole tube (37) »an inner tube (34) and the Sliding tube (37) enveloping jacket (35) and with propellants (36) sum driving deft sliding tube (37), the slip tube (37) at the lower end (42) at least one suction mouth for Has sucking up dredged material, characterized in that the lower end (42) of the sliding tube (3?) For leading through of the method according to claim 4 or 5 free outside the Sheath (35) can be pushed out and withdrawn again into the same. 7 * suction dredger device according to claim 6, characterized characterized in that at least one pressurized water pipe (43) on the sliding pipe (37) > which has an outlet mouth (52) for pressurized water at the lower end, attached. 8. suction excavator device according to claim 6 or 7, characterized in that the Sohieberohr (37) between co can be moved in two positions, with its lower end co a large piece inside or outside of the jacket JJ (35) is located. ο 9. suction excavator device according to claim 8, characterized oo (37) co marked that the lower end of the Sohieberrohres / as a Suction basket (38) is also formed.