JP6504499B2 - Modifier mixing method for soft soil - Google Patents

Description

  The present invention relates to a method for mixing soft soil with soft soil such as clay soil with a modifier such as steelmaking slag or cement produced as a by-product in the refining process of steel to improve the strength of soft soil. .

  Modified soil obtained by strengthening soft soil by mixing steelmaking slag, which is produced as a by-product in the process of iron and steel refining, with 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 two substances easily and in a large amount, there is known a method of mixing using a transfer of a belt conveyor, but this method mainly uses sandy soil with a low dry state or a low water content ratio. It was intended for mixing of cement and cement etc. and it was not suitable for mixing soft soil with high water content ratio such as clay with high content of silt and clay and steelmaking slag (for example, non-patent document 1) See).

  Moreover, as another method of mixing soft soil and additives, soft soil to which the additive is added is introduced into a tall columnar cylindrical kneading device, and the inside of the device 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 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 equipment becomes large-scaled and the installation place is limited, and such a kneading apparatus is often provided with stirring means such as paddles operated by electric power to obtain a sufficient mixing state. There is a demand for the development of an apparatus capable of mixing soft soil and steelmaking slag with a simple structure.

  Therefore, as a new modifying agent mixing method, utilizing the advantages of the mixing method using the transfer of the belt conveyor and the method of mixing soft soil and additives using falling energy, soft soil such as clay is available. It has led to the development of a mixing method capable of simply and inexpensively mixing together with a modifier such as steelmaking slag (see Patent Document 3).

  In this mixing method, steelmaking slag is added to a soft soil adjusted to have appropriate viscosity and fluidity at a predetermined ratio, and the soft soil to which the steelmaking slag is added is connected downstream of each belt conveyor. The soft soil to which steelmaking slag is added is dropped from the discharge side end of the belt conveyor from a certain height and made to collide with the mixing repulsion body while transferring toward each other at every transit between the belt conveyors It is designed to mix steelmaking slag and soft soil.

JP, 2009-121167, A Japanese Patent Application Laid-Open No. 11-028719 JP, 2014-173285, A Pre-mixing method Technical manual (revised edition) Coastal Technology Research Center December 61, 2008 p.

  However, in the prior art as described above, after introducing a modifier such as steelmaking slag into soft soil, a plurality of (at least three times or more) transits between belt conveyors and repulsion for falling and mixing at that time It is necessary to repeat the collision with the above, and it is necessary to secure a certain distance from the position where a modifier such as steelmaking slag is thrown into soft soil to the final placement position, so There is a limitation, for example, it is unsuitable for placing reformed soil directly at a location close to the reclaimer vessel, such as the back of the revetment.

  Therefore, in view of such conventional problems, the present invention has a high degree of freedom of application, and can easily and inexpensively mix soft soils such as clay and modifying agents such as steelmaking slag. It is intended to provide a modifier mixing method.

  In order to solve the above-mentioned conventional problems, the feature of the invention according to claim 1 is that soft soil is mixed with a modifier at a predetermined ratio, and it is poured from the side of the forerunner and allowed to flow down the forehead In the method of mixing a modifier with soft soil as described above, a dropping conveyor is installed so that the dropping side end is higher than the dropping ground in front of the shoulder by a desired drop height, and the dropping ground is placed A set of flow control side walls extended from the discharge point to the flow direction downstream, and a modifier added soft soil in which a modifier is added at a predetermined ratio to a fixed amount of soft soil adjusted to a desired water content ratio Is dropped from the dropping conveyor between the flow control side walls, the modifier-added soft soil is stored between the flow control side walls while maintaining a constant mixing effective thickness, and is stored between the flow control side walls. For the said dropping on the said modified material addition soft soil In addition to mixing the modifying material and the soft soil by sequentially dropping the modifying-material-added soft soil from the soil, the modified soil obtained by mixing the modifying material and the soft soil is used as the flow control side wall. It is in the method of mixing the modifier with soft soil, which is pushed down along the flow direction and the modified soil is made to flow down along the slope.

  A feature of the invention described in claim 2 is that, in addition to the configuration of claim 1, the ratio of the flow-down direction length of the flow-down regulating side wall to the wall height is formed larger than the slope of the slope.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the reformed soil which has been extruded in the flow-down direction along the flow control side wall and which has flowed down along the slope reaches a certain amount. In each case, the dropping point of the dropping conveyor and the flow control side wall are moved along the shoulder.

The feature of the invention according to claim 4 is that, in addition to the constitution according to any one of claims 1 to 3, the desired water content ratio is 1.36 to 1.85 times the liquid limit, and the mixed effective thickness is 30 cm to 1.5 m.

  As described above, in the method of mixing a modifier with soft soil according to the present invention, a soft soil is mixed with a modifier at a predetermined ratio, and the soft soil is charged from the side of the shoulder and allowed to flow down the slope. In the modifier mixing method for soft soil, a dropping conveyor is installed so that the dropping side end is higher than the dropping ground in front of the shoulder by a desired drop height, and the dropping point on the dropping ground A pair of flow control side walls extended from the flow direction to the downstream side are installed, and the modifier added soft soil to which a modifier is added at a predetermined ratio is dropped onto a fixed amount of soft soil adjusted to a desired water content ratio. The softened soil is dropped between the flow-restricting side walls from the conveyor, and the modified material-added soft soil is stored between the flow-restricting side walls while maintaining a constant mixing effective thickness, and is stored between the flow-restricting side walls The dropping congee on the modifier-added soft soil The modifier-added soft soil is sequentially dropped from the bottom to mix the modifier and the soft soil, and the modified soil obtained by mixing the modifier and the soft soil along the flow control side wall It is not necessary to connect a plurality of belt conveyors by pushing the reformed soil down along the slope, and it is not necessary to transit a plurality of belt conveyors, and when it is dropped from the dropping conveyor onto the ground with a simple structure It can be mixed with a modifier such as slag and can supply high quality modified soil to the slope.

  Further, in the present invention, by forming the ratio of the flow-down length of the flow-restricting side wall to the wall height larger than the slope of the slope, the flow can be promoted while constant mixing effectiveness is achieved between the flow-restricting side walls. It is possible to temporarily store modifier-added soft soil with a thickness.

  Furthermore, in the present invention, whenever the reformed soil which has been extruded in the downflow direction along the flow control side wall and flowed down along the slope reaches a certain amount, the dropping point of the dropping conveyor and the flow control side wall By moving the and along the shoulder, it is possible to cope with a wide range of application scope.

Furthermore, in the present invention, the desired water content ratio is 1.36 to 1.85 times the liquid limit, and the mixing effective thickness is 30 cm to 1.5 m to effectively carry out the method of the present invention. it can.

It is a schematic side view which shows an example of the embodiment of the modifier mixing method with respect to the soft soil which concerns on this invention. It is a partial expanded sectional view which shows the outline of the mixing part in FIG. (A)-(d) is sectional drawing for demonstrating the mixing principle same as the above. It is sectional drawing for demonstrating the moving process of the falling control side wall in this invention.

  Next, an embodiment of the method of mixing a modifier with soft soil according to the present invention will be described based on the examples shown in FIGS. In addition, the code | symbol A in a figure is a landfill place which places modification soil.

  Land reclamation site A is separated from the offshore side by revetment structure 1 and sloped gently toward the inside of reclamation site A by modified soil placed on the back side of revetment structure 1 (slope 2 (slope) ) Are formed, and modified by adding modifiers 4, 4... Such as steelmaking slag at a predetermined ratio to soft soil 3 from the upper edge near the shoulder 2 a, ie, the slope 2 The soil is introduced and flowed down along the slope 2 to place the modified soil.

  In the method of the present invention, at the time of placing this modified soil, modifying materials 4, 4 ... such as steelmaking slag are added at a predetermined ratio to soft soil 3 such as clay, and they are mixed and reformed It produces soil.

  The apparatus used in the method of the present invention adjusts the moisture ratio of the soft soil 3 to be fed to the transfer means 6 including the conveyer 5 for dropping the soft soil 3 such as clay to the landfill A. Water content ratio adjustment means (not shown), a modifier supply means 7 for adding modifiers 4 such as steelmaking slag to the soft soil 3 moving the transfer means 6, A soft soil 3 (hereinafter referred to as a modifier-added soft soil 17) having a pair of flow control side walls 8 and 9 to be installed, to which the modifiers 4 and 4 are added, is interposed between the flow control side walls 8 and 9 Is supposed to be dropped.

  Further, in this apparatus, a flow promoting means 10 is provided for promoting the flow down from the flow regulating side walls 8 and 9 to the slope 2 side, and a mud drilling machine is used as the flow promoting means 10, for example.

  For example, as shown in FIG. 1, as the transfer means 6, a floating earth ship (reclaimer ship) floated on water is used, and the soft soil 3 such as clay is collected from the earth transportation ship 12 by the backhoe 11 or the like. , The predetermined amount of it is cut out and sequentially supplied to the near side belt conveyor 13, and after the modifiers 4, 4 ... such as steelmaking slag are added on the near side belt conveyor 13, the dropping conveyor 5 It is designed to supply

  The dropping conveyor 5 is rotatably mounted on the hull horizontally and vertically, and the dropping side end is higher than the dropping ground surface in front of the shoulder 2a by a desired drop height h, and flows down from the shoulder 2a. It is installed so as to be located on the front side in the direction.

  In addition, the code | symbol 14 in a figure is a hopper for soft soil supply provided with the feeder which can adjust discharge amount, Comprising: Soft soil 3 such as clay which was lifted from the earth transportation ship 12 by backhoe 11 etc. It is inserted into the hopper 14 and is cut out at a predetermined amount and sequentially supplied to the near side belt conveyor 13.

  The water content ratio adjusting means is disposed on the upstream side of the front side belt conveyor 13 like a water adding device for watering the soft soil 3 mounted on the earth transportation vessel 12 and the soft soil 3 is a modifier 4 such as steel slag. The water content ratio is adjusted to be optimal for the mixture with (4), (4).

  The soft soil 3 has a water content ratio of 1.36 to 1.85 times the liquid limit (wL), ie, 1.36 wL to 1.85 wL (%), and the soft soil 3 has appropriate viscosity and fluidity. It will be adjusted to the state.

  The modifying material supply means 7 includes, for example, a modifying material supply hopper 15 having a feeder capable of adjusting the discharge amount, and a modifying material supply belt conveyor 16 disposed on the near side belt conveyor 13. .. Modified materials 4, 4, ... made of steelmaking slag, etc. cut out by a fixed amount by a feeder are sequentially introduced into the soft soil 3 on the near side belt conveyor 13 by the belt conveyer 16 for reforming material, soft soil 3 The modifiers 4, 4, ... such as steelmaking slag are added at a predetermined ratio (10 to 40 vol%) on the upper side.

  As shown in FIG. 2 and FIG. 3, the flow control side walls 8, 9 are extended from the drop point to the downstream side in the downstream direction from the drop point on the flat portion of the dumping ground in front of the shoulder 2a. Are set to face each other at an interval W. In addition, the interval W of the flow control side walls 8 and 9 is such that the soft soil adjusted to the water content ratio of 1.36 wL to 1.85 wL (%) can be maintained at a constant mixing effective thickness D (30 cm to 1.5 m) It is set.

  Here, the mixed effective thickness D is a thickness which is affected by an impact at the time of dropping, and means a thickness sufficient to prevent the diffusion of the modifiers 4. In addition, if the effective mixing thickness D can maintain a certain thickness (30 cm) or more, a predetermined mixing effect can be obtained, but if it is thicker than necessary (1.5 m), the drop height h becomes correspondingly lower and the collision The upper limit of the effective mixing thickness D is preferably about 1.5 m, because the speed at the time decreases and the mixing range also decreases.

  The flow-down regulating side walls 8 and 9 are formed, for example, by erecting a steel plate or the like, so that the installation position can be easily changed.

  The ratio between the flow length L and the wall height H of the flow control side walls 8 and 9 is larger than the slope of the slope 2, and the modifier-added soft soil 17 dropped from the dropping conveyor 5 flows down It is made to be able to store, maintaining fixed mixing effective thickness D (30 cm-1.5 m) in the flow direction front side side between regulation side walls 8 and 9 while maintaining constant.

  In addition, a blocker 18 is disposed at the sea-side end of the double flow restriction side walls 8 and 9 so as to close the opening on the sea side between the double flow restriction side walls 8 and 9. In the present embodiment, as shown in FIG. 1 and FIG. 2, the sea-side end of the flow control side walls 8 and 9 is the back side of the revetment structure 1 in this embodiment. The end face of the back-in portion 1 a is made to be a closed body 18 by being in contact with the end face of 1 a. The closing body 18 may be formed of a plate material such as a steel plate, and the closing body 18 and both flow-down regulating side walls 8 and 9 may form a U-shaped frame opened in the downstream direction on the downstream side. .

  Furthermore, both flow control side walls 8 and 9 are installed between back flow control side walls 8 and 9 by, for example, installing them on a back-in portion 1a made of back stone or solidified modified soil before the shoulder 2a. It is preferable to secure the strength at the bottom, and if the strength of the bottom between the two flow control side walls 8, 9 is insufficient due to installation on the modified soil layer before solidification, etc. A steel plate is disposed at the bottom between the two and the strength is secured at the bottom between the double flow control side walls 8 and 9.

  Next, a specific procedure of the modifier mixing method for soft soil will be described.

  First, as shown in FIG. 1, the transfer means (reclaimer vessel) 6 is moved to a predetermined position near the revetment, and the dropping side end of the dropping conveyor 5 is positioned in front of the shoulder 2a. Install so as to be as high as h.

  Further, in accordance with the installation of the dropping conveyor 5, the flat portion of the dropping ground in front of the shoulder 2a is extended from the dropping point to the downstream side from the dropping point and faces each other at the desired distance W in the direction intersecting the flowing direction. Install a pair of flow control side walls 8 and 9 in the same manner.

  Next, after measuring the water content ratio of soft soil 3 such as dredged soil transported by the soil transport ship 12 in advance, the soft soil 3 is changed such as steelmaking slag by adding water by the water content ratio adjusting means. Adjust the condition to be suitable for mixing the materials 4, 4 ..., that is, the condition having appropriate viscosity and fluidity (soft soil 3 has a moisture ratio of 1.36 wL to 1.85 wL (%)) .

  Next, the soft soil 3 whose water content ratio is adjusted is lifted by the backhoe 11 or the like, and is thrown into the soft soil feeder hopper 14.

  The soft soil 3 fed into the soft soil feeding hopper 14 is cut out every predetermined amount, fed into the near side belt conveyor 13, and transferred in a state of being leveled on the near side belt conveyor 13.

  Then, to this fixed amount of soft soil 3 transferred, modifiers 4 such as steelmaking slag are added at a predetermined ratio from the modifier supply means 7. That is, the modifiers 4, 4 ... are cut out in a fixed amount from the hopper 15 for modifying material feed, which are sequentially transferred onto the near side belt conveyor 13 by the belt conveyor 16 for modifying material, soft soil 3. Add at a predetermined ratio on top. At that time, since the soft soil 3 has a moisture content of a certain level or more, the modifiers 4, 4 having a larger specific gravity than the soft soil 3 are in a state of being embedded in the soft soil 3.

  Then, the soft soil 3 (hereinafter referred to as soft material-added soft soil 17) to which the modifiers 4, 4, ... such as steelmaking slag are added is transferred onto the dropping conveyor 5, as shown in FIG. As shown, from the end portion of the dropping conveyor 5, it is sequentially dropped between the two flow control side walls 8 and 9 of the dropping destination ground.

  Lateral flow is restricted by the flow control side walls 8 and 9 so that the modifier-added soft soil 17 which has been dropped is controlled at the discharge point, that is, at the front side in the flow direction between the flow control side walls 8 and 9 They are sequentially stacked and temporarily stored while maintaining a constant mixed effective thickness D (30 cm to 1.5 m), and when the mixed effective thickness D is exceeded, the weight of the newly added soft material-added soft soil 17 is dropped. The reformed soil in the part already mixed is pushed out toward the shoulder 2a.

  At that time, first, as shown in FIG. 3 (a) to FIG. 3 (b), the dumped modifier-added soft soil 17a is placed on the modifier-added soft soil layer 20 temporarily stored at the dump point. The soft soil 3 is mixed with the upper layer of the existing soft soil 3 due to the impact at that time, and the modifiers 4 with a specific gravity larger than that of the soft soil 3 are contained in the existing soft soil 3 To spread.

  Next, as shown in FIG. 3 (c) to FIG. 3 (d), when the new modifier-added soft soil 17b is dropped, the existing modifier-added soft soil 17a dropped before that and It falls to the overlapping part, and the soft soil 3 of each other is mixed by the impact, and the new modifiers 4, 4 ... of the soft soil added with soft soil 17b are added to the existing soft soil with modified material 17a. While diffusing toward the outside, the modifiers 4, 4... Of the existing modifier-added soft soil layer 17a further diffuse toward the outside.

  Therefore, by repeating the series of actions shown in FIGS. 3 (a) to 3 (d), new modifier added soft soil 17b sequentially dropped is added to the existing modifier previously dropped. The impact on the soft soil 17a is repeated, and the impact causes the modifiers 4, 4 ... to be evenly diffused in the soft soil 3, and the soft soil 3 and the modifiers 4 ... are mixed. Modified soil is produced.

  On the other hand, when the modifier-added soft soil layer 20 exceeds a certain mixing effective thickness D, the newly dropped modifier-added soft soil 17 is modified according to the weight of the soft soil 17 and the pressure from both flow control side walls 8 and 9. The materials 4, 4 ... are repeatedly diffused and extruded from the reformed soil of the existing portion in a state of being sufficiently mixed, and sequentially pushed out toward the method shoulder 2a.

  In this series of mixing steps, for example, when the effective mixing thickness D is set to 30 cm, and the average volume of each modifier-added soft soil 17a is 5 liters, the area of influence of the drop is 50 × 50 cm. Assuming that the mixing effective thickness D is maintained at 30 cm, the volume of the mixed portion is maintained at 15 times (75 liters) the volume (5 liters) of each modifier-added soft soil 17a. Since the existing modifier-added soft soil 17 is pushed down in the downward direction every time the proper modifier-added soft soil 17a is charged, the newly dropped 5-liter modifier-added soft soil 17 flows down It is calculated that 15 times of new dropping of modifier-added soft soil is repeated 15 times until it is pushed out in the direction, and the kneading is performed each time, so that the modifier-added soft soil 17 is dropped until it is pushed out. 15 times So that the kneading is repeated.

  Next, using the flow promoting means 10 such as a mud drilling machine or the like, the flow of the reformed soil generated from the flow control side walls 8, 9 to the slope 2 side is promoted using the flow promoting means 10, so-called reformed soil method. It is made to flow down along the slope 2 by the shoulder flow down method and placed in the landfill A.

  In addition, when the installation range is wide, etc., as shown in FIG. 4, the conveyor for dropping 5 whenever the reformed soil made to flow down along the slope 2 reaches a certain amount, as needed. The above-described series of operations may be repeated by moving the dropping point and the flow control side walls 8, 9 along the shoulder 2a.

  In the modifier mixing method for soft soil thus configured, the soft soil 3 is adjusted to a water content ratio (1.36 wL to 1.85 wL (%)) suitable for mixing, and the soft soil 3 has an appropriate viscosity and Since it has fluidity, it is stored while maintaining a constant mixing effective thickness D (30 cm to 1.5 m) between the flow control side walls 8 and 9, and it is newly added on the existing modifier-added soft soil layer 20. When a soft modifier-added soft soil 17 is dropped, as shown in FIG. 3, the soft soil 3 is taken into the upper layer of the modifier-added soft soil layer 20 so that the water is disturbed by the water fall. The modifiers 4, 4... Are diffused and mixed by impact when they collide with the existing modifier-added soft soil layer 20, and the mixing is repeated every time the modifier-added soft soil 17 is dropped.

  Therefore, a predetermined kneading effect can be obtained at a point dropped from the dropping conveyor 5, and it is not necessary to take over a plurality of conveyors, and it is preferably high even in a place close to the reclaimer ship such as the back side of the revetment structure It can supply quality modified soil.

  Next, the reference experiment which verified the effect of the modifier mixing method to the soft soil concerning the present invention is explained. The same components as those of the above-described embodiment will be described with the same reference numerals.

  In this experiment, the water content ratio is adjusted to soft soil 3 (liquidity limit w L = 101.3%) such as clay soil by water etc., and there is a predetermined ratio (30 vol% in this experiment) there such as steelmaking slag etc. Drop the modifier added soft soil 17 (samples 1 to 7) formed by adding the modifiers 4, 4 ... between the flow control side walls 8 and 9 from the drop height h (h = 5 m) The mixing operation is performed, and the uniaxial compressive strength of the modified soil formed on the 28th day is measured, and the average compressive strength and visual observation are used to improve the soft soil 3 and the reformer such as steel slag 4,4. The mixed state with .. was evaluated.

  In addition, the modified soil formed similarly when the thickness D of the modifier-added soft soil layer 20 temporarily stored between the flow control side walls 8 and 9 is different (D = 10 cm, 30 cm, 50 cm) The uniaxial compressive strength of the 28th day of material was measured, and the mixing state was evaluated by the average strength and visual observation.

  In this experiment, uniaxial compressive strength (hereinafter referred to as indoor compounding strength) of the test specimen uniformly mixed in the same composition as the above-mentioned cases (hereinafter referred to as indoor compounding strength) is measured in advance. It evaluated by whether strength ratio (beta) (= average strength for every sample / indoor mixing strength) with respect to compounding strength satisfy | fills 0.7 or more.

  That is, since the uniaxial compressive strength of the generated modified soil depends on the degree of kneading of the soft soil and the modifier, each of the indoor compounding strengths which are uniformly mixed and the desired strength is expressed, The degree of kneading of the soft soil of each sample and the modifier is evaluated by the uniaxial compressive strength of the sample, that is, the strength ratio β.

The strength ratio β, which is the standard, is standardized based on past construction data in this type of pre-mixing method, and the strength is used when the purpose of using the modified soil is to prevent liquefaction only. The ratio β = 0.5 and the intensity ratio β = 0.7 are set in order to reduce the earth pressure. For the evaluation of the present invention, a method with better kneadability was targeted, and a condition satisfying the strength ratio β = 0.7 or more was set.
The results are shown in Table 1.

  When the water content ratio of soft soil 3 is low (water content ratio 1.23 wL (%)), the strength ratio is less than 0.7 for any effective mixing thickness D, and sufficient strength is not expressed, and mixing is sufficient It was confirmed that it was not.

  Also, even when the water content ratio is high (water content ratio 1.97 wL (%)), the strength ratio is less than 0.7 for any effective mixture thickness D, and sufficient strength is not expressed, and mixing is sufficient. It was confirmed that there was not.

  Furthermore, even when the water content ratio of the soft soil 3 is 1.36 wL to 1.85 wL (%), when the effective mixing thickness D of the modifier-added soft soil layer 20 is 10 cm, the strength ratio is It was less than 0.7 and remained at half or less of the indoor compounding strength.

  On the other hand, in the case where the water content ratio of soft soil 3 is 1.36 wL to 1.85 wL (%) and the effective mixing thickness D of the modifier-added soft soil 17 is 30 cm or more (D = 30 cm and 50 cm) Also in the case of the strength ratio β is 0.7 or more, it was also confirmed by visual observation that modifiers 4, 4 ... such as steelmaking slag are uniformly mixed in soft soil 3 .

  From this, in the mixing of the soft soil 3 of the present invention with the modifiers 4, 4, ..., the soft soil 3 is adjusted to a desired water content ratio, and the soft soil 3 has appropriate viscosity and fluidity. It has been confirmed that a suitable mixed state can be obtained by adjusting the water content ratio of the soft soil 3 to 1.36 wL to 1.85 wL (%).

  In addition, in mixing the soft soil 3 of the present invention with the modifiers 4 and 4 such as steelmaking slag, it is sufficient to secure a mixing effective thickness D (30 cm or more) of a certain level or more at the dropping point. It was also confirmed that the strength was secured.

  In the above-described embodiment, although the example in which steelmaking slag is added to the soft soil 3 flowing on the front side belt conveyor 13 by using the belt conveyor 16 for modifying material supply has been described, The means for adding the slag is not limited to the above-mentioned embodiment, for example, soft soil 3 cut out by a fixed amount directly to the dropping conveyor 5 is charged, and a fixed amount is flowed on the soft soil 3 flowing on the dropping conveyor 5 It may be made to feed modifiers 4, 4, ..., such as steelmaking slag cut out every time.

  Moreover, although the above-mentioned Example demonstrated the example which applied steelmaking slag to modifiers 4 and 4 ..., modifiers 4 and 4 are not limited to steelmaking slag, For example, it is cement It may be.

A Landfill 1 Revetment structure 2 slope 3 Soft soil 4 Reforming material 5 Conveyor for dropping 6 Transportation means 7 Reforming material supply means 8, 9 Flow restriction side wall
DESCRIPTION OF REFERENCE NUMERALS 10 drifting promoting means 11 backhoe 12 soil transportation vessel 13 front side belt conveyor 14 hopper for soft soil supply 15 hopper for modifying material supply 16 belt conveyor for modifying material supply 17 modifying material added soft soil 18 closed body 20 modifying material Added soft soil layer

Claims (4)

In a method of mixing a modifier with soft soil, the modifier is mixed with the soft soil at a predetermined ratio, and the mixed material is introduced from the near side of the shoulder and allowed to flow down the slope.
A dropping conveyor is installed so that the dropping end is higher than the dropping ground in front of the shoulder by a desired drop height, and a pair of the dropping points is extended downstream from the dropping point on the dropping ground. Install the flow control side wall of the
A modifier-added soft soil obtained by adding a modifier at a predetermined ratio to a fixed amount of soft soil adjusted to a desired moisture content is dropped between the flow control side walls from the dropping conveyor, and between the flow control side walls The modifier-added soft soil is stored while maintaining a constant mixing effective thickness, and the modifier-added soft soil from the dropping conveyor is placed on the modifier-added soft soil that is stored between the flow control side walls. By sequentially dropping the soil, the reformer and the soft soil are mixed, and the reformed soil obtained by mixing the modifier and the soft soil is extruded in the flowing direction along the flow control side wall, A modifying agent mixing method for soft soil characterized in that the modified soil is caused to flow down along the slope.   The modifier mixing method for soft soil according to claim 1, wherein the ratio of the flow-down direction length to the wall height of the flow-down regulating side wall is formed larger than the slope of the slope.   Every time the reformed soil which has been pushed down in the downflow direction along the downflow control side wall and made to flow down along the slope reaches a certain amount, the dropping point of the downfeed conveyor and the downflow control side wall are along the shoulder The modifier mixing method to soft soil according to claim 1 or 2 to move. The desired water content ratio is 1.36 to 1.85 times the liquid limit, and the mixing effective thickness is 30 cm to 1.5 m . The modifier mixing for soft soil according to any one of claims 1 to 3. Method.

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