JP2019085844A - Soft soil mixing equipment - Google Patents

Abstract

To provide a soft soil mixing equipment capable of efficiently mixing soft soil such as dredge soil and reformer such as steelmaking slag in a space saving manner.SOLUTION: The mixing equipment is configured so that soft soil A, which is supplied with modifier and sequentially dropped from the discharge side end of a belt conveyor 4, collides with the mixing acceleration collision portion 30, and the soft soil A is repelled by the inner inclined surfaces 31, 31 and collected at the bottom of the mixing acceleration collision portion 30 and falls to the drop destination in a massive shape A1. With this, degradation of the drop mixing effect due to dispersion of the soft soil by collision is prevented.SELECTED DRAWING: Figure 2

Description

  TECHNICAL FIELD The present invention relates to a mixing apparatus for soft soil to improve the strength of soft soil by mixing a modifying material such as steelmaking slag with soft soil such as clay.

  In the past, calcia-modified soil formed by strengthening soft soil by mixing it with steelmaking slag generated as a by-product in the process of iron and steel refining as a modification material in soft soil such as clay soil etc. The method of using as a civil-engineering material of is proposed (for example, refer patent document 1, Paragraph 0035).

  As a method of mixing steelmaking slag with soft soil such as clay soil, steelmaking slag is added at a predetermined ratio to a fixed amount of soft soil charged to a stirring device such as a mechanical mixer, and this is stirred by the stirring device And forced mixing method, in-pipe mixing method of pneumatically feeding soft soil with steelmaking slag added at a predetermined ratio, and using the turbulent flow effect of plug flow generated in the feeding pipe There is known a method of adding steelmaking slag at a predetermined ratio to soft soil stored in a cargo ship or the like and forcibly mixing it with a backhoe.

  In addition, as a method of mixing two substances easily and in a large amount, a method of mixing using a transfer of a belt conveyor is also known (see, for example, Non-Patent Document 1).

  Furthermore, as another method of mixing soft soil and additives, the soft soil to which the additive is added is introduced into a tall column-type cylindrical kneading apparatus, and the inside of the apparatus is dropped, and the fall energy at that time It is also conceivable to mix soft soil and additives by utilizing (see, for example, Patent Document 2).

  However, in the mixing method using the conventional stirring apparatus and the in-pipe mixing method, since the dedicated equipment is required, the facility must be large-scaled, for example, in the case of the in-pipe mixing method There is a problem that the construction cost is increased because it requires an air pressure ship for mixing and pumping soil and steelmaking slag.

  On the other hand, the mixing method using the backhoe is not suitable for mass construction while it can be simply and inexpensively constructed using a general purpose machine.

  The mixing method using the transfer of the belt conveyor is mainly intended for the dry state or the mixing of sandy soil with a low water content with cement, etc. It is not suitable for mixing soft soil with high water content with steelmaking slag, and when applied to mixing soft soil with steelmaking slag, soft soil such as clay is not sufficiently mixed with steelmaking slag, so It was necessary to carry out forced mixing separately by a biaxial mixer etc., and it was compelled that the facility became large-scale as in the mixing method using a stirrer.

  In addition, in the method of mixing soft soil and additives by utilizing falling energy, it is necessary to install the kneading apparatus in a stable state, since it uses a tall and unstable column-type kneading apparatus. There is a problem that the installation becomes large and the installation place is limited, and such a kneading apparatus is often provided with stirring means such as a paddle operated by electric power to obtain a sufficient mixing state. There is a demand for development of an apparatus capable of mixing soft soil with a modifying material such as steelmaking slag with a simple structure.

  Therefore, the inventor of the present application has determined that the discharge side end of the upstream side belt conveyor has a predetermined drop height from the input side end of the downstream side belt conveyor at the connecting part of the belt conveyor that transfers soft soil with reformer supply. It was installed so as to be at a higher position by a certain distance, and was provided with a mixing repulsion body arranged below the discharge side end of each belt conveyor with a predetermined collision distance, and dropped from the discharge side end of each belt conveyor Development of a mixing device (hereinafter referred to as a junction-type drop impact mixing device) in which mixing of soft soil and modifying material is promoted by colliding modifier-supplied soft soil with a mixing repulsion object (See Patent Document 3).

  This connecting part drop impact type mixing device does not require large-scale equipment such as a tower type mixing device or a stirring device since it uses the transfer of the belt conveyor used to transfer the soft soil with modifier added. A large amount of construction is possible.

JP, 2009-121167, A Japanese Patent Application Laid-Open No. 11-28719 JP, 2014-173285, A Pre-mixing method Technical manual (revised edition) Coastal Technology Research Center December 61, 2008 p.

  In order to obtain a sufficient mixing promoting effect in the connection part drop impact type mixing apparatus as described above, the process of causing the modifier-supplied soft soil to fall and collide against the mixing repellant from a certain height is repeated several times. It has been confirmed by experiments that it is necessary to carry out (at least three times or more), and the necessary number of drop collisions is secured using slopes formed on the use of floating conveyors etc. and the place to which modified soil is thrown. ing.

  However, depending on the construction site, it may not be possible to arrange a plurality of belt conveyors in space, and it may not be possible to secure the necessary number of drop collisions depending on the construction of belt conveyors. There has been a problem that in the case of offshore construction / submersion of soil, the slope of the input destination can not be used as a mixing repulsion body.

  In addition, in the connection part drop impact type mixing apparatus, when a certain lump of soft soil supplied with modifier material dropped from the belt conveyor is dispersed into a plurality by impact when it collides with the mixing repulsion body, that state However, there is a problem that the mixing promoting effect by the drop collision can not be sufficiently utilized even if the collision with the next mixing repulsion body occurs.

  Therefore, in view of such conventional problems, the present invention aims to provide a soft soil mixing device capable of efficiently mixing space-saving soft soil such as clay and steelmaking slag and other modifiers. It was made as

  The feature of the invention according to claim 1 for solving the above-mentioned conventional problems is provided with a belt conveyor installed so that the discharge side end is higher than the upper surface of the dropping destination by a desired drop height. A soft soil supplied with a modifier at a predetermined ratio to the soft soil is dropped from the belt conveyor to promote mixing of the soft soil with the modifier. The mixing apparatus includes a mixing promoting means disposed below the dropping side end of the belt conveyor at a predetermined distance from the dropping side end of the belt conveyor and the dropping destination, and the mixing promoting means is on the bottom side And a groove-shaped mixing collision portion having a narrow width on the bottom side, the mixing collision portion being disposed with the groove direction inclined at a predetermined angle, the discharge side of the belt conveyor The above modifiers dropped sequentially from the end The supplied soft soil collides with the collision promoting portion for mixing, and the soft soil after the supply of the modifier is repelled to the inner inclined surface and collected at the bottom side of the collision promoting portion for mixing promotion It is to fall to the said drop destination.

  A feature of the invention according to claim 2 is that, in addition to the constitution of claim 1, the mixing promoting means is formed in a bellows shape by arranging a plurality of the mixing promoting collision parts in parallel.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the belt conveyor is disposed at the discharge destination of the belt conveyor, and the discharge side end of the belt conveyor is desired from the upper surface of the discharge destination And the mixing promoting means is disposed below the discharge side end at a predetermined distance from the discharge side end of the belt conveyor and the discharge destination, respectively. is there.

  According to a fourth aspect of the present invention, in addition to the configuration of any one of the first to third aspects, the earth transportation vessel is disposed at the discharge destination of the belt conveyor, and the mud storage section of the earth transportation vessel is The auxiliary mixing promoting means having an auxiliary mixing promoting collision plate portion installed at an inclination to a predetermined angle is provided, and the lump of the modifier-supplied soft soil is made to collide with the auxiliary mixing promotion collision plate portion. It is.

A feature of the invention according to claim 5 is, in addition to the constitution according to any one of claims 1 to 3, the delivery destination of the belt conveyor is the ground near the shoulder and the ground near the shoulder, The auxiliary mixing promoting means having an auxiliary mixing promoting collision plate portion installed at an inclination to a predetermined angle is provided, and the lump of the modifier-supplied soft soil is made to collide with the auxiliary mixing promotion collision plate portion. It is.

  The mixing apparatus for soft soil according to the present invention has the configuration according to claim 1 and, at the time of collision with the mixing collision part formed of the inner inclined surface, together with the mixing effect utilizing the energy at the time of falling. A modifier such as steel slag by the mixing action by the repulsive force that the modifier such as steelmaking slag and the soft soil receive from the inner inclined surface as well as the mixing action by the penetration of the modifier such as steelmaking slag into soft soil by impact And soft soil are suitably mixed. In addition, the modifier-supplied soft soil which has been repelled by the inner inclined surface collides with the other inner inclined surface constituting the mixing collision portion, and the mixing is further promoted. In addition, the soft soil supplied with modifier dispersed by the collision to the bottom of the mixing collision part is aggregated, and the next drop impact work can be efficiently performed by being lumped, and a higher mixing promotion effect can be obtained. .

  Further, according to the present invention, by providing the configuration according to claim 2, it is possible to cope with a wide belt conveyor.

  Further, in the present invention, by providing the configuration according to the third aspect, it is possible to efficiently mix using the connecting portion of the belt conveyor.

  Furthermore, in the present invention, by providing the configuration according to claim 4, the number of times of drop mixing can be secured with a simple structure when there is no slope on the arrangement of the belt conveyor or the dropping end as in sea installation etc. can do.

  Further, according to the present invention, by providing the configuration according to the fifth aspect, it is possible to secure the number of times of drop mixing by utilizing the shoulder portion.

It is a schematic side view which shows an example of the mixing apparatus of the soft soil which concerns on this invention. It is a partial expanded side view which shows the state of the mixing by the mixing acceleration | stimulation means in FIG. It is a schematic front view same as the above. It is a graph which shows the result of having compared the uniaxial compression strength in the effect confirmation experiment of the mixing apparatus concerning this invention. It is a graph which shows the frequency distribution of the uniaxial compression strength same as the above, Comprising: (a) is a case where the mixing promotion means is not provided, (b) is a case where the mixing promotion means is provided. It is a front view which shows an example of the other aspect of the mixing acceleration | stimulation means in the mixing apparatus which concerns on this invention.

  Next, the embodiment of the mixing apparatus for soft soil according to the present invention will be described based on the examples shown in FIGS. 1 to 3. In the figure, reference numeral 1 denotes a reclaimer ship, and reference numeral 2 denotes an earth handling boat for transporting the modified soil B thrown from the reclaimer ship 1.

  The mixing device 3 includes a belt conveyor 4 installed so that the discharge side end 4 a is higher than the dropping end by a desired drop height H, and a mixture arranged under the discharge side end 4 a of the belt conveyor 4. The soft soil A supplied with the modifier is moved from the belt conveyor 4 toward the mixing accelerator 5 while moving on the belt conveyor 4 and the soft soil A supplied with the modifier is transferred while softened. The mixing of the soil 6 and the modifier 7 is promoted.

  In this embodiment, as shown in FIG. 1, soft soil 6 such as dredged soil 6 is lifted from the earth transportation vessel 9 by a backhoe 8 or the like on a landslide vessel (reclaimer vessel 1) floated on water, After each fixed amount is cut out and sequentially supplied to the uppermost stream belt conveyor 10 and after the modifier 7 such as steelmaking slag is supplied to the soft soil 6 on the belt conveyor 10, it transits to the belt conveyor 4 and mixes from the belt conveyor 4 The soft soil A having been supplied with the modifying material is dropped onto the earth transportation vessel 2 through the mixing promoting means 5.

  In addition, the code | symbol 11 in a figure is the hopper 11 for soft soil supply provided with the feeder which can adjust discharge amount, Comprising: Soft soil 6 such as clay soil which was lifted from soil transportation ship 9 by backhoe 8 etc. It is put into the hopper 11 for supply, it is cut out for every fixed amount, and it is made to supply one by one to the belt conveyor 10 of the most upstream.

  Further, the mixing device 3 is provided with a water content ratio adjusting means for adjusting the water content ratio of the soft soil 6, although not shown in particular, and the soft soil 6 is adjusted to a water content optimum for mixing with the modifier 7 such as steelmaking slag. You may do it.

  When steelmaking slag is used as the modifier 7, the water content ratio of the soft soil 6 is 1.2 to 1.8 times the liquid limit (wL), and the soft soil 6 has appropriate viscosity and fluidity. In particular, it is desirable to adjust the flow value by the cylinder flow test (NEXCO test method 313) to 85 to 250 mm.

  Further, the mixing apparatus 3 includes a modifier supply means 12 for supplying a modifier 7 such as steelmaking slag toward the soft soil 6, and supplies the modifier 7 at a predetermined ratio to the soft soil 6. It is supposed to be.

  The modifying material supply means 12 includes, for example, a hopper 13 having a feeder capable of adjusting the discharge amount, and a modifying material supply belt conveyor 14 disposed on the most upstream belt conveyor 10, and is fixed by the feeder A modifying material 7 such as steelmaking slag cut out for each amount is sequentially supplied to soft soil 6 on a belt conveyor 10 by a belt conveyor 14 for modifying material supply, and a predetermined ratio (10 to 40 vol%) on soft soil 6 The reformer 7 such as steelmaking slag is to be supplied.

  If the steelmaking slag has a large particle size and weight, the disturbance effect in the soft soil 6 is high, and it is preferable that the steelmaking slag has a particle size of 10 mm to 25 mm and 20% or more of the whole steelmaking slag.

  Then, the soft soil A supplied with the modifier 7 on the uppermost stream belt conveyor 10 is dropped from the discharge side end of the uppermost stream belt conveyor 10, and the feed side end of the belt conveyor 4. It falls toward the part 4b and promotes the mixing of the soft soil 6 and the modifier 7 by using the drop of the connecting part.

  As shown in FIG. 1, the belt conveyor 4 is installed at a position where the input side end 4b is lowered and the discharge side end 4a is inclined, and the discharge side end 4a is predetermined in the vertical direction from the input destination. It is arrange | positioned so that it may become high position by the fall height H of.

  Then, the modifier-supplied soft soil A is discharged from the discharge side end 4a of the belt conveyor 4 and falls, and the energy from the fall is used to combine the soft soil 6 with the modifier 7 such as steel slag. It is designed to promote mixing.

  The falling height H is such a height that a mixing effect using falling energy can be expected when mixing the soft soil 6 and the steelmaking slag.

  As shown in FIGS. 2 and 3, the mixing promoting means 5 is integrally formed of a steel plate or the like, and has a V-shaped groove-like mixing promoting collision portion 30 whose bottom side is narrow.

  The mixing promotion collision portion 30 has a pair of inner inclined surfaces 31, 31 inclined to the bottom side so as to form an angle δ with each other, both inner inclined surfaces 31, 31 are arranged in a valley fold with each other, and the bottom side is narrow. It is formed in a V-shaped groove shape.

  Further, the mixing promotion collision portion 30 is disposed with the groove direction inclined at a predetermined angle θ with respect to the horizontal plane.

  The angles δ and θ are set at an angle δ of 60 to 120 degrees and an angle θ of 0 to 60 degrees in consideration of various conditions such as the state of the soft soil 6, the type of the modifier 7, and the drop height H. Be done.

  In the mixing promoting means 5, the central portion of the mixing promoting collision section 30 is located between the discharge side end 4 a of the belt conveyor 4 and the input destination (here, the earth transportation vessel 2). And it arrange | positions so that fixed distance d1, d2 may each be separated from an injection destination, and it is arrange | positioned so that the lower end of the mixing promotion collision part 30 may be located in the injection destination side.

  The distance d1 from the discharge side end 4a of the belt conveyor 4 to the mixing promotion collision part 30 and the distance d2 from the mixing promotion collision part 30 to the charging destination are each at least 1 m or more from the central part of the mixing promotion collision part 30 , Desirably 2 m or more. In the present embodiment, the installation member 17 is installed at the end of the earth transportation boat 2 for transportation, which is the input destination, and the mixing promotion means 5 is supported by the installation member 17 to adjust the heights d1 and d2. ing.

  Then, the modifier-supplied soft soil A, when dropped from the discharge side end 4 a of the belt conveyor 4, collides with any of the inner inclined surfaces 31, and then the other inner inclined surface 31 due to repulsion at the time of collision. It collides, and while repeating this, it slides down on the inner inclined surfaces 31, 31 and is received by the lower end side of the bottom of the mixing promotion collision portion 30.

  Then, the modifier-supplied soft soil A which has moved to the lower end of the bottom of the mixing promotion collision section 30 remains at the bottom end of the bottom of the mixing promotion collision section 30, and when it reaches a certain amount, it is extruded and becomes lump A1. It is dropped to the earth transportation boat 2 for transportation which is the dropping destination.

  The earth transportation vessel 2 is provided with auxiliary mixing promoting means having an auxiliary mixing promoting collision plate portion 20 installed at an inclination of a predetermined angle γ (γ = 0 to 60 degrees), and the auxiliary mixing promotion collision plate portion 20 In this case, massive reformer-supplied soft soil A1 collides with it to promote mixing.

  The auxiliary mixing promoting collision plate portion 20 is formed of a steel plate or the like, and is formed in the edge portion of the mud portion 21 of the earth transporting ship 2 so as to be inclined from the upper edge toward the bottom 21b.

  Then, the massively dropped modifier-supplied soft soil A1 collides with the auxiliary mixing accelerating collision plate portion 20, and the impact thereof promotes mixing of the soft soil 6 and the modifier 7 .

  Next, a mixing method using such a mixing apparatus 3 will be described. The same components as those in the above-described embodiment will be described with the same reference numerals.

  First, after measuring the water content ratio of soft soil 6 such as dredged soil transported by soil transport ship 9 in advance, the soft soil 6 is reformed such as steel slag by adding water by the water content ratio adjusting means. In a state suitable for mixing with the material 7, a state having appropriate viscosity and fluidity (in the case of steelmaking slag, the water content ratio of the soft soil 6 is 1.2 to 1.8 times the liquid limit, cylinder flow test Adjust so that the flow value of (NEXCO test method 313) is 85 to 250 mm.

  Next, the soft soil 6 whose water content ratio is adjusted is lifted by the backhoe 8 or the like, and is put into the soft soil supply hopper 11.

  The soft soil 6 fed into the soft soil feeding hopper 11 is cut out every predetermined amount, fed into the uppermost stream belt conveyor 10, and transported in a leveled state on the belt conveyor 10.

  Then, a modifier 7 such as steelmaking slag is supplied to the fixed amount of soft soil 6 transferred from the modifier supply means 12 at a predetermined ratio. That is, the modifying material 7 such as steelmaking slag is cut out by a feeder for every fixed amount, and it is sequentially transferred onto the belt conveyor 10 by the modifying material supply belt conveyor 14 and supplied onto the soft soil 6 at a predetermined ratio. .

  Then, the soft soil 6 (soft soil A with reformed material supply) to which the modifier 7 such as steelmaking slag is supplied is made to have a predetermined drop height (1 m) using the transfer section between the belt conveyors 10 and 4 The mixture is dropped from ̃4 m) and mixed, and the modifier 7 such as steelmaking slag and the soft soil 6 are mixed (first mixing).

  Next, the modifier-supplied soft soil A is transferred on the belt conveyor 4 and dropped from the discharge side end 4 a of the belt conveyor 4 toward the mixing promoting means 5, and the mixing promoting collision part 30 of the mixing promoting means 5. Make a collision (2nd mixing).

  At that time, the soft soil 6 is adjusted to a water content ratio (1.2 to 1.8 times the liquid limit wL) suitable for mixing, and the soft soil 6 has appropriate viscosity and fluidity so that it can be dropped. Of the modifier 7 such as steelmaking slag by the impact when it collides with the mixing promotion collision section 30 and the mixing action by the penetration into soft soil 6 of the modifier 7 such as steelmaking slag etc. Soil 6 is mixed.

  In addition, when the soft soil A supplied with modifier falls to the mixing promotion collision portion 30 collides with either of the inner inclined surfaces 31, 31, the modifier 7 such as steel slag and the soft soil 6 are inside. While mixing by the mixing action by the repulsive force received from the inclined surfaces 31, 31, it collides with the other inner inclined surfaces 31, 31 by the repulsive force, and is similarly mixed.

  Then, the modifier-supplied soft soil A moves to the lower end side of the bottom portion of the groove-like mixing promotion collision portion 30 while being repeatedly collided with the inner inclined surfaces 31, 31, and is stopped there.

  Thereafter, the modifier-supplied soft soil A which has moved to the lower end side of the bottom of the mixing promotion collision portion 30 remains at the bottom end side of the bottom of the mixing promotion collision portion 30 and gathers. When the material-supplied soft soil A reaches a certain amount, it is pushed out and formed into a lump, and falls onto the earth transportation boat 2 for transportation, which is a dropping destination.

  The modifier-supplemented soft soil A1 pushed out from the lower end side of the bottom portion of the mixing promotion collision portion 30 and dropped in a lump collides with the collision plate portion 20 for auxiliary mixing promotion (third mixing).

  And with the mixing effect utilizing the energy at the time of falling, the mixing action by the penetration of the modifier 7 such as steelmaking slag into the soft soil 6 by the impact when it collides with the collision plate portion 20 for auxiliary mixing promotion The modifier 7 such as steelmaking slag and the soft soil 6 are mixed by the mixing action by the repulsive force that the modifier 7 such as slag and the soft soil 6 receive from the collision plate portion 20 for auxiliary mixing promotion.

  At that time, the modifier-supplied soft soil A repeatedly collides between the inner inclined surfaces 31, 31 and then is received by the lower end side of the bottom portion of the mixing promotion colliding portion 30 and drops as a lump A1, A higher mixing promotion effect can be obtained as compared to the case of dropping without passing through the promotion collision part 30.

  As a result, the drop mixing is repeated a plurality of times (total 3 times), and the modified soil B in which the soft earth 6 is mixed with the modifying material 7 such as steelmaking slag at a predetermined ratio is generated, The soil B is sequentially stored in the storage unit 21 of the earth transportation vessel 2.

  In the mixing device 3 configured as described above, the soft soil A supplied with the modifier material discharged from the belt conveyor 4 falls toward the mixing promotion collision portion 30, and collides with the inner inclined surfaces 31, 31 to perform mixing. After being repeatedly collided with the inner inclined surfaces 31, 31 and then received at the lower end side of the bottom of the mixing promotion collision portion 30 and temporarily stored, and aggregate from that state to form a lump A1 After, it falls to the loading place.

  Therefore, in the mixing device 3, the soft soil A1 supplied with the modifier is dumped in a lump for the third drop mixing by using the mixing promoting means 5 having the mixing promoting collision part 30, so The falling mixing effect by the simple auxiliary mixing promoting collision plate portion 20 installed on the ship 2 can be enhanced, and it is difficult to secure a plurality of falling mixing times as in the case of marine construction or subsea loading Also by the simple auxiliary mixing promotion means installed in the earth transportation vessel 2, the opportunity of falling mixing can be secured.

  FIGS. 4 and 5 show the results of experiments comparing the effects of the case where the soft soil A supplied with the modifier is dropped directly from the belt conveyor 4 to the charging destination and the case of using the present invention. .

  In the experiment, the soft soil 6 was adjusted to a water content ratio of 200% (liquid limit 115%), and the amount of steelmaking slag added was 30 vol%, and the drop height of the junction between the belt conveyors 10 and 4 was 2 m, and the drop height H was The effects of the mixing promoting unit 5 were confirmed by comparing the uniaxial compressive strengths of 20 test pieces of 28 days old with 4.5 m and heights d1 and d2 of 2 m, respectively.

  As a result, as shown in FIG. 4, it was confirmed that the uniaxial compression strength is higher when the present invention is used than when the mixing promoting means 5 is not used.

  The mode of the mixing promoting means 5 is not limited to the above-mentioned embodiment, and as shown in FIG. 6, a plurality of mixing promoting collision parts 30, 30... Are arranged in parallel and formed in a bellows shape It may be In this case, it is possible to cope with the case where the soft soil A with a modifier supplied is supplied from the wide belt conveyor 4.

  Moreover, although the above-mentioned Example demonstrated the case where the reclaimer ship 1 was used, this invention is not limited to such a structure, For example, each connecting part of several belt conveyors 4 installed on the ground The mixing promoting means 5 may be provided respectively.

  In addition, each configuration of the mixing device according to the present invention can be appropriately changed, and for example, the steelmaking slag may be supplied to the soft soil by throwing the soft soil onto the steelmaking slag.

  Moreover, in the above-mentioned Example, although steelmaking slag was demonstrated as an example as the modifier 7, the modifier 7 is not limited to steelmaking slag.

  Further, in the above-described embodiment, when the earth transporting ship 2 is disposed at the discharge destination of the belt conveyor 4 and the mud storage portion of the earth transporting ship 2 is provided with the auxiliary mixing promoting means 20 having the collision plate portion for auxiliary mixing promotion. However, it may be dropped directly on the mud part 21 of the earth transporting ship 2 without passing through the auxiliary mixing promoting means 20.

  At that time, the soft soil 6 is changed by the impact of falling by dropping the soft soil A1 supplied with the modifier through the mixing promoting means 5 into the mud part 21 where a fixed amount of the modified soil B is stored. While being mixed with the upper layer of the soil B, the modifier 7 having a specific gravity larger than that of the soft soil 6 diffuses into the soil B in the mud portion 21.

  Then, new modifier-supplied soft soil A1 is sequentially dropped, and by repeating this process, soft soil 6 and modifier 7 are evenly diffused and mixed.

  Furthermore, in the above-mentioned embodiment, although the case where the discharge destination of the belt conveyor 4 was set to the earth transportation boat 2 was explained, the input destination is not limited to the earth transportation ship, for example, the discharge destination is the ground in front of the shoulder. It may be made to pour down the slope and put the modified soil into the landfill.

  In that case, as in the above embodiment, the auxiliary mixing promoting means having the auxiliary mixing promoting collision plate portion installed at a predetermined angle on the ground near the shoulder is provided with the auxiliary mixing promotion collision plate portion. Impact the massive modifier-supplied soft soil so that the mixing-promoted modified soil flows down the slope over the shoulder.

1 Earth unloading vessel (reclaimer vessel)
2 Earth Transport Vessel 3 Mixing Device 4 Belt Conveyor 5 Mixing Aid Means 6 Soft Soil 7 Modified Material (Steelmaking Slag)
DESCRIPTION OF SYMBOLS 8 backhoe 9 soil transportation ship 10 belt conveyor 11 hopper for soft soil supply 12 modifier supply means 13 hopper 14 belt conveyor 17 for modification material supply installation member 20 collision board part 21 for auxiliary mixing promotion 21 mud part 30 mixing promotion Collision part 31 inside inclined surface

Claims (5)

The soft soil is provided with a belt conveyor installed so that the discharge side end is higher than the upper surface of the dropping destination by a desired drop height, and the soft soil is supplied with the modifier at a predetermined ratio, and the soft soil is supplied with the soft soil. In a mixing apparatus for soft soil, wherein the mixing of the soft soil and the modifier is promoted by
The apparatus further comprises a mixing promoting means disposed below the discharge side end of the belt conveyor at a predetermined distance from the discharge side end of the belt conveyor and the discharge destination, respectively.
The mixing promoting means has a groove-shaped mixing collision portion having an inner inclined surface inclined to the bottom side and a narrow width on the bottom side, and the mixing collision portion is disposed with the groove direction inclined at a predetermined angle. And
The soft soil supplied with modifying material sequentially dropped from the discharge side end of the belt conveyor collides with the collision promoting portion for mixing promotion, and the soft soil supplied with modifying material repels the inner inclined surface, A mixing apparatus for soft soil characterized in that it is collected on the bottom side of the mixing promoting collision part, and is dropped in a lump as the dropping destination.   The mixing device for soft soil according to claim 1, wherein the mixing promoting means is formed in a bellows-like shape by arranging a plurality of the mixing promoting collision parts in parallel. A conveyor belt is disposed at the discharge end of the conveyor belt,
The belt conveyor is installed so that the discharge side end is higher than the upper surface of the discharge destination by the desired drop height, and is constant below the discharge side end of the belt conveyor from the discharge side end of the belt conveyor and the discharge destination. The mixing apparatus for soft soil according to claim 1 or 2, wherein the mixing promoting means is disposed at a distance of. A earth transportation vessel is placed at the discharge point of the belt conveyor,
The mud storage section of the earth transportation vessel is provided with auxiliary mixing promoting means having an auxiliary mixing promoting collision plate section installed at an inclination to a predetermined angle, and the lumps of reforming are formed on the auxiliary mixing promotion collision plate section. The mixing apparatus for soft soil according to any one of claims 1 to 3, wherein the soft soil for which the material supply is completed collides. The delivery point of the belt conveyor is the ground near the shoulder,
The ground near the shoulder is provided with auxiliary mixing promoting means having an auxiliary mixing promoting collision plate portion installed at an inclination to a predetermined angle, and the lumped reforming material supply to the auxiliary mixing promotion collision plate portion The mixing apparatus of the soft soil according to any one of claims 1 to 3, wherein the soft soil has a collision.

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