JP4018111B2 - Ground improvement machine - Google Patents

Description

  The present invention relates to a ground improvement machine for improving soil by agitation and mixing with a solidified material such as a granular material or a slurry while excavating the ground to construct a foundation such as a structure.

Discharge device that is attached to the agitator that performs excavation and agitation processing of the ground for ground improvement, and discharges solid or granular solid material into the soil in parallel with the excavation and agitation processing of the soil by the agitation device The ground improvement machine (trencher) provided with is already known so that it may be seen also in the following patent documents 1-3.
JP-A-9-250129 JP 2003-138554 A Patent No. 3096019

  Among the above-described conventional techniques, in particular, in the discharge device described in Patent Document 1, the fixed cylinder shaft of the stirrer and the rotating cylinder shaft inserted through the agitator respectively intersect the axial direction and the axial center line. Since the structure is such that an opening is formed at the intersection of the slit groove by rotating the rotating cylinder shaft, and the solidified material is discharged from the opening, the excavation into the slit groove In addition to the large amount of mud that has entered the slit groove, it is easy to bite into the slit groove, causing trouble in discharging the solidified material. Therefore, there is a problem in that the sprockets are arranged and rotated on both ends of the shaft, and stones or the like are caught in the exposed sprockets, which easily cause troubles in the rotating operation of the rotating cylindrical shaft.

  Further, in the discharge device described in Patent Document 2, an outer tube corresponding to the fixed cylindrical shaft is rotated by a dedicated driving device, and the outer tube and an inner tube corresponding to the rotating cylindrical shaft are provided. Since the slit grooves corresponding to the slits are formed long in the axial direction, the seal structure is complicated and there are structural problems, and the mud excavated in the slit groove of the rotating outer pipe is It is the same as described above that it is likely to cause troubles in the rotating operation of the outer pipe by entering many, and mud entry preventing fins are provided in the outer pipe, but due to its orientation, it is only in one direction in the soil. There is a problem that the outer tube cannot be rotated.

  Furthermore, in the discharge device described in Patent Document 3, the guide provided on the outer periphery of the nozzle that discharges the solidified material is fixed to the rotation direction side of the rotating cylinder shaft (front of the nozzle) with respect to the nozzle. Therefore, similarly to the technique described in Patent Document 2 in which mud fins are provided, there is a problem that the rotating cylinder shaft can be rotated only in one direction in the soil.

  In general, even if foreign matter or the like is caught in the rotating shaft in the soil, it can often be eliminated by reversing the rotating direction, and therefore the rotating shaft can be rotated forward and backward. Although the structure described in Patent Document 2 and Patent Document 3 is capable of reverse rotation, when it is reversely rotated, mud fins and induction insulators attract foreign matter into the slit groove. And the harmful effects will be enormous. Furthermore, since the solidification material supply path of the discharge device described in Patent Documents 1 to 3 is configured to be closed at one end portion of the fixed cylinder shaft, the solidification material stagnates or accumulates at the end portion thereof, and the solidification material is smooth. Discharging may not be expected. Also, the chain of the agitator and the sprocket that engages with it are in direct contact with the earth and mud, and there is a high risk of biting stones and other foreign objects during excavation. Is desirable.

  Further, in any of the above Patent Documents 1 to 3, the pipeline system for supplying the solidifying material to the discharge device is supplied only from one end side of the fixed cylinder shaft and the rotating cylinder shaft, and the other end side is closed. Therefore, there is a problem in that the solidified material discharge portion as designed in advance cannot be achieved because the solidified material accumulation portion or stagnation occurs on the other end side.

  Then, this invention aims at providing the discharge apparatus of the ground improvement machine which solved the fault which the art of patent documents 1-3 has.

  In order to achieve the above object, the invention according to claim 1 is directed to a stirrer for excavating and stirring the ground for ground improvement, and a soil mounted in the stirrer in parallel with the excavation and stirring for soil. A ground improvement machine having a discharge device for discharging solid or slurry-like solidified material therein, wherein the stirring device is provided with a drive sprocket rotatably on the upper part of the machine frame, and is non-rotatably fixed. A support shaft portion that is configured as a double cylinder structure by a cylindrical shaft and a rotatable rotating cylindrical shaft and also serves as a solidified material discharge pipe is provided horizontally at the lower part of the machine frame, and the drive is provided on the outer periphery of the rotating cylindrical shaft. A driven wheel that is paired with the sprocket is fixed, and a drive chain having a stirring blade is wound between the driven sprocket and the driven wheel, and the discharge device forms a solidified material discharge pipe together with the rotating cylinder shaft. Solid The cylindrical shaft is formed with at least one through-hole that opens on an outer peripheral surface thereof, and the rotary cylindrical shaft is opened on the outer peripheral surface and is aligned with the through-hole according to relative rotation with the fixed cylindrical shaft. A discharge hole is formed, and further, solidified material supply pipes are connected to both ends of the fixed cylinder shaft, and the solidified material pumped from the both ends into the fixed cylinder shaft is matched with the through-hole. It is made to discharge from.

  Here, in the case of using a granular material as the solidifying material, a loop-shaped solidifying material supply as described in claim 2 is provided in order to prevent stagnation and retention of the solidifying material in the solidifying material discharge pipe. A route is desirable. That is, the solidified material feeding pipe introduced up to the discharge device is bifurcated into a solidified material supply pipe, one solidified material supply pipe is provided at one end of the fixed cylinder shaft, and the other solidified material supply pipe is provided as a fixed cylinder. It is desirable to form a loop-shaped solidified material supply path by connecting to the other end of the shaft. In this case, it is more preferable that the solidification material supply distance from the branch portion to both ends of the fixed cylinder shaft forming the solidification material discharge pipe is set to be equal.

  By using such a loop-shaped solidified material supply path, the solidified materials that have been pumped from two directions collide with each other in the fixed cylinder shaft, and an appropriate turbulence is generated, thereby causing the solidified material in the solidified material discharge pipe to flow. Stagnation and retention can be prevented.

  Further, the double cylinder structure solidified material discharge pipe which also serves as the support shaft portion is, for example, as described in claim 10, wherein the fixed cylinder shaft is a rotating cylinder shaft as an inner cylinder of the double cylindrical structure solidified material discharge pipe. However, the same type as the outer cylinder of the solidified material discharge pipe having a double cylinder structure is employed.

  It should be noted that the use of the driven wheel is advantageous in preventing the problem that the drive chain bites stones and foreign objects during excavation and stirring operation.

  Further, in consideration of the direction of excavation by the agitator during excavation and agitation processing of the ground, as described in claim 3, the through hole is a lower part of the outer peripheral surface of the fixed cylinder shaft forming the solidified material discharge pipe. It is desirable to be provided within a range of 180 degrees on the side.

  By adopting the above-mentioned through holes and discharge holes, solidified material discharge from the solidification material discharge pipe is not continuous discharge, but intermittent discharge only while the through holes and discharge holes overlap each other It becomes a form. In consideration of such an intermittent discharge mode, the through hole and the discharge hole have a single circular shape as described in claim 4 and the other has a length in which the circumferential direction of the cylinder axis is the longitudinal direction. The hole shape is advantageous in preventing the excavated soil from entering the solidified material discharge pipe from the discharge hole while ensuring the sealing performance at the time of non-discharge.

In this case, as described in claim 5, when the through hole on the fixed cylinder shaft side is a single circular shape and the discharge hole on the rotating cylinder shaft side is a long hole, the through hole and the discharge hole It is possible to secure a long time for the two to overlap each other.

  Furthermore, as described in claim 6, at least one through hole and a discharge hole are individually provided at both longitudinal ends of the fixed cylinder shaft and the rotary cylinder shaft forming the solidified material discharge pipe, and the through holes are provided. If the discharge holes are offset from each other in the circumferential direction at both longitudinal ends, the solidified material is discharged alternately and intermittently from both longitudinal ends of the solidified material discharge pipe.

  Here, when it is necessary to increase or decrease the discharge amount according to the construction conditions or the like, if the opening area of the discharge hole is a constant size, there is a possibility that the increase or decrease of the discharge amount cannot be flexibly handled. For example, when the opening area of the discharge hole is relatively small and the required discharge amount is large, the required amount of solidified material cannot be discharged. On the other hand, when the opening area of the discharge hole is relatively large and the required discharge amount is small, the pressure at the discharge hole may be reduced and may be blocked.

  Therefore, on the premise that the opening area of the discharge hole is set to the assumed maximum area, the nozzle piece for adjusting the opening area of the discharge hole as described in claim 7 is provided with a rotary cylinder shaft. It is desirable to attach it detachably.

  Furthermore, as described in claim 8, a band plate member made of an elastic material is bent and fixed to the through hole to prevent foreign matter from entering into the through hole and to push back to enter. It is better to do so. In addition, as described in claim 9, by providing a plate-shaped earth discharge fin on the outer periphery of the rotating cylinder shaft so as not to interfere with the discharging hole, the rotating cylinder shaft can be properly aligned without attracting mud into the discharging hole. Reverse rotation is possible.

  According to the first aspect of the present invention, since the driven wheel that is paired with the drive sprocket on which the drive chain is wound is adopted on the solidification material discharge pipe side that also serves as the support shaft portion, And no biting in. In addition, since the discharge device is configured so that the solidified material is discharged when the discharge hole of the rotating tube shaft rotates and matches the through hole of the fixed tube shaft, the mud enters the tube shaft compared to the slit groove. Is greatly reduced. Furthermore, since the solidification material supply pipe is connected to both ends of the fixed cylinder shaft forming the solidification material discharge pipe, the stagnation and retention of the solidification material inside the solidification material discharge pipe can be eliminated, and the solidification material discharge The state is stabilized, and this tendency becomes more conspicuous especially when the loop-shaped solidified material supply path is used as described in claim 2.

  According to the sixth aspect of the present invention, at least one through-hole and a discharge hole are individually provided at both ends in the longitudinal direction of the fixed cylinder shaft and the rotary cylinder shaft forming the solidified material discharge pipe. Since the hole and the discharge hole are offset from each other in the circumferential direction between both ends in the longitudinal direction, the solidified material is alternately discharged from both ends in the longitudinal direction of the solidified material discharge pipe. Mixing and stirring efficiency with earth and sand is improved.

  According to the seventh aspect of the present invention, since the nozzle piece for adjusting the opening area of the discharge hole is detachably attached to the rotating cylinder shaft, the opening area can be easily adjusted according to the construction conditions or the required discharge amount of the solidified material. Therefore, the solidification material discharge amount can be optimized by preventing the solidification material discharge amount from being excessive or insufficient and clogging in the discharge holes.

  Hereinafter, more specific embodiments of the ground improvement machine according to the present invention will be described with reference to the drawings.

  FIG. 1 shows an example of a ground improvement machine using a backhoe as a base machine 1 as a construction machine. This ground improvement machine will be described later while excavating the ground at the tip of an arm 2 in a self-propelled base machine 1. A stirrer 3 for performing a mixing stirring process with the solidifying material is attached. A solidifying material discharge device 4 is provided at the free end portion of the stirring device 3. As the solidifying material, for example, a powdery material such as cement and a slurry-like material can be used, and the solidifying material is supplied via a solidifying material pumping tube 23 attached to the agitator 3 or the arm 2 and a pumping source (not shown). However, since the pumping equipment and the like are well known, the illustration and description thereof are omitted here.

  2 and 3 show the details of the stirring device 3, and as shown in the figure, the machine frame 6 connected to the arm 2 on the base machine 1 side is provided with a bracket portion 7 composed of both side plates at the upper portion thereof, and this bracket portion. 7 and a post 8 having a box shape in section with a predetermined length, and a hydraulic motor 9 is fixed in the bracket portion 7. The hydraulic motor 9 has a drive sprocket 10 that can rotate coaxially with the motor output shaft, and a drive chain (hereinafter simply referred to as “chain”) serving as a winding transmission means between the drive sprocket 10 and a driven wheel 13 described later. 11) is wound around. The post 8 is provided with idlers (tensioners) 12 that rotate following the chain 11 while guiding the chain 11, and the discharge device 4 is attached to the free end of the post 8. On the outer peripheral side of the chain 11, stirring blades 14 are fixed at regular intervals, and excavation blades 15 are fixed to the stirring blades 14 so as to be replaceable. The excavating blade 15 has sharpened front and rear portions in the rotational direction so that excavation can be performed even when the chain 11 rotates in the reverse direction.

  4 and 5 show details of the discharge device 4. As shown in the figure, bearing blocks 17 and 17 are fixed to a pair of left and right brackets 16 and 16 connected to the free end of the post 8, respectively. The fixed cylinder shaft 18 is supported between the bearing blocks 17 and 17 so as not to rotate. A rotating cylindrical shaft 19 is coaxially and rotatably fitted on the fixed cylindrical shaft 18 via a bush-shaped bearing member 33. A flange portion 20 is coupled to both ends of the rotary cylinder shaft 19, and the rotary cylinder shaft 19 is attached to the bearing blocks 17 and 17 in a state where both ends are supported via the flange portion 20 and a bearing 21 having a sealing function. The bearing is rotatably supported.

  Thus, the fixed cylinder shaft 18 and the rotary cylinder shaft 19 form a solidified material discharge pipe 22 having a double cylinder structure in which the fixed cylinder shaft 18 is an inner cylinder and the rotary cylinder axis 19 is an outer cylinder. The material discharge pipe 22 also serves as a support shaft portion as a support portion of the driven wheel 13 described later.

  A driven wheel 13 is fixed to the central portion of the outer periphery of the rotating cylindrical shaft 19 by welding or the like so as to be aligned with the position of the drive sprocket 10. The driven wheel 13 can rotate integrally with the rotating cylindrical shaft 19. It is like that. Here, the drive sprocket 10 has a claw or a tooth portion that engages with the chain 11, whereas the driven wheel 13 has a simple cylindrical shape without them, and is driven by the drive sprocket 10. The driven wheel 13 rotates synchronously by the frictional force when 11 rotates around. Therefore, unlike the drive sprocket 10, the driven wheel 13 does not have a claw or a tooth portion, so that it is significantly less likely to bite stones or foreign objects.

  Solidified material supply pipes 5 are connected to both ends of the fixed cylinder shaft 18, respectively. These are looped in a quadrilateral shape and are combined into a single solidified material pressure feed pipe 23 on the free end side of the post 8. As shown in FIGS. 1 and 2, the pipe 23 extends toward the arm 2 along the side surface of the post 8 and is connected to a pumping facility (not shown) via a flexible hose while being supported by the arm 2 as appropriate. Is. That is, the solidified pumping pipe 23 is bifurcated as a pair of left and right solidifying material supply pipes 5 at a position closest to the driven wheel 13, and the fixed cylinder shaft 18 forming the solidifying material discharge pipe 22 from the branched portion. One solidifying material supply pipe 5 is connected to one end of the fixed cylindrical shaft 18 and the other solidifying material supply pipe 5 is connected to the other end of the fixed cylindrical shaft 18 so that the solidifying material supply distances to both ends of the fixed cylindrical shaft 18 are equal. Are connected to each other to form a solidified material supply path that is symmetrical in the left-right direction and is equidistant in the left-right direction.

  In addition, since the solidification material supply pipe 5 is exposed at the excavation operation portion as shown in FIG. 4, the solidification material supply pipe 5 is connected and reinforced to the bracket 16 by the connecting member 24. Further, the inner diameter of the fixed cylindrical shaft 18 forming the solidifying material discharge pipe 22 is set to be slightly larger than the inner diameters of the left and right solidifying material supply pipes 5.

  6 and 7 show details of the solidified material discharge pipe 22 in the discharge device 4 shown in FIG. 4, and FIGS. 6A and 6B show an exploded perspective view and an assembled view of the solidified material discharge pipe 22. FIG. 7A is a development view of the solidified material discharge pipe 22, and FIG. 7B is a sectional view taken along the line AA of FIG. 7A. 6 and 7, the bearing member 33 of FIG. 4 is not shown. As shown in FIGS. 6 and 7 in addition to FIG. 4, one through-hole 25 is formed at each of the longitudinal end portions of the peripheral surface of the fixed cylindrical shaft 18 toward the lower surface, that is, in the direction in which the stirring device 3 is advanced. On the other hand, two discharge holes 26 are formed along the circumferential direction at both ends in the longitudinal direction of the peripheral surface of the rotary cylinder shaft 19, and these discharge holes 26 are formed with the fixed cylinder shaft 18 and the rotary cylinder shaft 19. Is formed at a position that coincides with the through hole 25 according to relative rotation.

  The through hole 25 on the fixed cylinder shaft 18 side is a single circular shape (simple circular shape) having a predetermined diameter, whereas the discharge hole 26 on the rotary cylinder shaft 19 side has a long diameter in the circumferential direction. As shown in FIG. 7, the discharge hole 26 is offset by a predetermined amount in the circumferential direction between both longitudinal ends of the rotary cylinder shaft 19 as shown in FIG. 19 is arranged in a so-called staggered manner so that the start and end portions of the discharge holes 26 at both ends in the longitudinal direction slightly overlap in the circumferential direction. Of course, the discharge hole 26 may be oval or rectangular. Moreover, the direction of the through-hole 25 is set to be obliquely downward as shown in FIGS. 8A and 8B in accordance with the construction conditions in addition to the direct downward as shown in FIG. 7B. Is also possible.

  Therefore, according to the ground improvement machine which concerns on such a structure, as shown in FIG. 1, the stirring apparatus 3 is connected with the front-end | tip part of the arm 2 of the base machine 1 via the bracket part 7, and the solidification material pumping pipe 23 is connected. Is connected to the pumping equipment, the agitating device 3 is vertically suspended on the ground E, the hydraulic motor 9 is driven, the chain 11 is moved in the up and down direction and the ground is excavated by the agitating blade 14 to perform the mixing agitation processing. .

  At the same time, the rotating cylinder shaft 19 forming the solidified material discharge pipe 22 is rotationally driven together with the driven wheel 13 and rotates relative to the fixed cylinder shaft 18 with the circular movement of the chain 11. As the fixed cylinder shaft 18 and the rotating cylinder shaft 19 rotate relative to each other, the single circular through hole 25 on the fixed cylinder shaft 18 side and the elongated discharge hole 26 on the rotating cylinder shaft 19 side are intermittently aligned. The solidified material is discharged from the discharge hole 26 into the soil only while the two match. The discharged solidified material is kneaded with the soil that has been excavated, mixed and stirred by the stirring blade 14.

  In this case, as shown in FIGS. 6 and 7, the circumferential positions of the long hole-like discharge holes 26 are offset from each other at both ends in the longitudinal direction of the solidification material discharge pipes 22. Although the discharge of the material is intermittent, the solidified material is discharged from the discharge holes 26 at both ends in the longitudinal direction of the solidified material discharge pipe 22 alternately.

  Then, as shown in FIG. 4, the solidification material supply path from the solidification material pumping pipe 23 to the solidification material discharge pipe 22 has a pair of solidification material supply pipes 5 branched into a bifurcated shape, and is solidified. Since the distance from the material pressure feed pipe 23 to the solidification material discharge pipe 22 through the pair of solidification material supply pipes 5 is set to be symmetrical and equal to each other in advance, the left and right solidification material supply pipes 5 In the process of reaching the inner space of the fixed cylindrical shaft 18, the inner space of the fixed cylindrical shaft 18 whose pressure is substantially equal on the left and right and whose inner diameter is larger than that of the solidifying material supply pipe 5 exhibits the function of a pressure accumulating chamber In the fixed cylinder shaft 18, the solidified materials pumped from two directions collide with each other to cause an appropriate disturbance, thereby preventing the stagnation and retention of the solidified material in the solidified material discharge pipe 22. Will be able to.

  FIG. 9 shows a modification of the relationship between the through hole 25 and the discharge hole 26 shown in FIG. 7 as the second embodiment of the present invention.

  In the second embodiment, as is apparent from a comparison between FIG. 7 and FIG. 9, each of the long-hole-like discharge holes 26 formed at both ends in the longitudinal direction of the rotary cylinder shaft 19 is used as one. The circumferential length is set longer.

  According to the second embodiment, the length of the discharge hole 26 is set to be longer than that of FIG. 7, so that the fixed cylinder shaft 18 and the rotary cylinder shaft 19 forming the solidified material discharge pipe 22 are provided. As a result, the matching time between the through hole 25 and the discharge hole 26 accompanying the relative rotation becomes longer, and as a result, the solidified material discharge time becomes longer.

  FIG. 10 shows still another modification of the relationship between the through holes 25 and the discharge holes 26 shown in FIG. 7 as the third embodiment of the present invention.

  In this third embodiment, as apparent from a comparison between FIG. 7 and FIG. 10, the relative positional relationship between the through hole 25 and the discharge hole 26 in FIG. In addition, one long hole-like through hole 25a is formed along the circumferential direction at the same phase position in the rotational direction at both ends in the longitudinal direction on the side of the fixed cylindrical shaft 18 forming the longitudinal axis of the rotary cylindrical shaft 19 Each discharge hole 26a having a single circular shape is formed by offsetting in the circumferential direction at both ends in the direction.

  According to the third embodiment, since the discharge hole 26a on the rotary cylinder shaft 19 side that finally determines the discharge direction of the solidified material has a single circular shape, (a) in FIG. As shown in (c), the long hole-like through hole 25a on the fixed cylinder shaft 18 side and the discharge hole 26a on the rotating cylinder shaft 19 side are matched, that is, the length of the long hole-like through hole 25a. Within this range, the discharge direction of the solidified material continuously changes with the relative movement between the through hole 25a and the discharge hole 26a, and a so-called swing operation is performed. Therefore, it becomes possible to discharge the solidification material in a wider range and in large quantities in the soil.

  Also in the third embodiment, the discharge direction from the through hole 25a may be inclined in the same manner as in FIG. 8 instead of directly below. In short, the through hole 25a is 180 degrees below the fixed cylindrical shaft 18. If the opening is within the range, the intended purpose can be achieved. Further, a plurality of single-circular through holes may be provided in the circumferential direction of the fixed cylindrical shaft 18 in place of the long hole-like through holes 25a.

  12 to 15 show a fourth embodiment of the present invention, and the same reference numerals are given to the parts common to the first embodiment of FIGS.

  In the fourth embodiment, as is apparent from the figure, it is the outer peripheral surface of the rotating cylindrical shaft 19 forming the solidified material discharge pipe 22 and does not interfere with the discharge hole 26, that is, in the circumferential direction. A plate-like earth discharging fin 30 is arranged so as to protrude radially between the adjacent discharge holes 26, 26.

  According to the fourth embodiment, since the solidified material is discharged from the discharge hole 26 into the space immediately after the mud is removed by the passage of the soil discharge fins 30, the discharge efficiency of the solidified material and thus the solidified material and the mud The mixing and stirring efficiency becomes even better. Such a secondary effect is the same even when the rotating cylinder shaft 19 is reversed. The earth discharging fin 30 may be fixed to the side surface of the driven wheel 13 that rotates together with the rotating cylinder shaft 19 instead of the rotating cylinder shaft 19.

  16 and 17 show a fifth embodiment of the present invention. In the fifth embodiment, as shown in the figure, in order to prevent foreign matter, stones, mud blocks, or the like from entering the through hole 25 of the fixed cylinder shaft 18, for example, a single circular through hole is used. A belt plate member 31 having a predetermined width made of an elastic material is arranged while being bent outward along the circumferential direction of the fixed cylinder shaft 18 in the diameter direction of 25, and both ends are fixed with screws 32 or the like. It is a thing. According to the fifth embodiment, it is possible to prevent foreign matters, mud blocks, and the like from entering the through holes 25 and push back the mud blocks to be entered.

  Since the band plate member 31 is curved inward at both ends of the attachment base portion to the fixed cylindrical shaft 18 and inflated at the center, the inner periphery of the rotating cylindrical shaft 19 is shown in FIG. When in sliding contact with the surface, the central portion is pushed to the inner peripheral surface of the rotating cylindrical shaft 19 or less, and when it is aligned with the discharge hole 26, it can bulge outward by elastic force. The fixed cylindrical shaft 18 and the rotating cylindrical shaft There is no obstacle to the discharge of the solidified material accompanying the relative rotation with respect to 19.

  In addition, although the both ends of the strip plate member 31 are fixed with the screws 32 or the like, only one of them may be fixed, and the other may not be fixed and may not fall off from the through hole 25 with self-elasticity.

  19 to 22 show a sixth embodiment of the present invention, and the same reference numerals are given to the parts common to the first embodiment shown in FIGS. 4 and 6 and 7.

  Assuming the relationship between the through hole 25 and the discharge hole 26 as shown in FIGS. 6 and 7, if the discharge amount needs to be increased or decreased depending on the construction conditions, the opening area of the discharge hole 26 is As described above, if the size is constant, there is a possibility that it may not be possible to flexibly cope with an increase or decrease in the discharge amount. For example, when the opening area of the discharge hole 26 is relatively small and the required discharge amount is large, the required amount of solidified material cannot be discharged. On the other hand, when the opening area of the discharge hole 26 is relatively large and the required discharge amount is small, the pressure at the discharge hole 26 decreases, and the discharge hole 26 may be clogged or blocked due to intrusion of mud or the like. There is.

  Therefore, in the sixth embodiment, as shown in FIG. 19, the opening area of the discharge hole 26 is set in advance to the assumed maximum area, and the detachable nozzle piece 34 is placed over the discharge hole 26. Accordingly, this is actively variably adjusted to reduce the opening area of the discharge hole 26, thereby adjusting the discharge amount of the solidified material. In FIG. 19, the nozzle piece 34 is hatched for easy identification of the nozzle piece 3.

  As shown in FIG. 20 in addition to FIG. 19, two halves having auxiliary discharge holes 34 a to surround the rotary cylinder shaft 19 are provided at positions corresponding to the discharge holes 26 on the outer periphery of the rotary cylinder shaft 19. The nozzle piece 34 is detachably mounted with a screw 35, and the effective width dimension of the discharge hole 26 is narrowed by the auxiliary discharge hole 34a. The nozzle piece 34 has a protrusion 36 shaped to engage and match a long hole-like discharge hole 26 formed on the rotating cylinder shaft 19 side, and an auxiliary discharge hole 34a is formed in the protrusion 36. It is. A plurality of nozzle pieces 34 having the same shape and size of the protrusion 36 and different width dimensions of the auxiliary discharge holes 34a are prepared, and can be replaced with ones having different width dimensions of the auxiliary discharge holes 34a as necessary. It has become.

  Therefore, according to the sixth embodiment, the effective opening area of the discharge hole 26 is positively variably adjusted only by replacing the nozzle piece 34 in accordance with the mud soil softness or soil properties, which are the actual construction conditions. Thus, the discharge amount of the solidifying material can be adjusted.

  Here, in the above-described embodiments, an example in which the present invention is applied to the so-called single type stirring device 3 shown in FIG. 1 has been shown. However, the present invention is a so-called double type or twin type as shown in FIGS. The same can be applied to the stirring device 3a.

  As shown in FIGS. 23 and 24, the stirring device 3a has a bracket portion 7a in the machine frame 6a connected to the arm 2 of the base machine 1 shown in FIG. The posts 8a and 8a are connected with a predetermined interval, and the discharge devices 4a and 4a are attached to the free ends of the posts 8a and 8a. Stirring blades 14a provided with excavating blades 15a are attached and fixed at predetermined intervals to chains 11a and 11a that are slidably contacted and guided by idlers 12a provided on the posts 8a and idlers 12b different from the idlers 12a. Are the two coaxial drive sprockets 10a and 10a in the hydraulic motor 9a fixed to the bracket portion 7a, and the driven wheels 13a and 13a of the rotating cylindrical shafts 19a and 19a supported by the brackets 16a and 16a on the posts 8a and 8a side. Between them.

  The structure of the discharge device 4a is the same as that shown in FIG. 4, and a solidifying material pumping tube 23a extending along one post 8a is connected to the solidifying material supply tubes 5a and 5a of the discharge devices 4a and 4a. It is.

  The idler 12b fixes a leaf spring 46 to the side surface of the post 8a, rotatably supports a pair of idle rollers 47, 47 spaced outside the central portion of the leaf spring 46, and idle rollers 47, Guide rails 48, 48 for preventing the chain 11a from falling off are provided between 47.

  Also in the ground improvement machine having such a double type or twin type stirring device 3a, similarly to the one shown in FIG. 1, the hydraulic motor 9a is driven to move the chain 11a around in the vertical direction, and the stirring blade 14a. In parallel with the excavation of the ground and the mixing and stirring process, the solidification material is intermittently discharged from the discharge device 4a.

The side view which shows the whole structure as 1st Embodiment of the ground improvement machine which concerns on this invention. The enlarged front view of the stirring apparatus shown in FIG. The side view of the stirring apparatus shown in FIG. Explanatory sectional explanatory drawing of the discharge apparatus shown in FIG. The side view of the discharge device shown in FIG. (A) is a disassembled perspective view of the solidification material discharge pipe shown in FIG. 4, (b) is an assembly drawing of the same figure (a). (A) is an expanded view of the solidification material discharge pipe | tube shown in FIG. 6, (b) is sectional drawing which follows the AA line of the same figure (a). (A), (b) is sectional drawing which shows the modification of the solidification material discharge pipe | tube shown to (b) of FIG. It is a figure which shows the 2nd Embodiment of this invention, (a) is an expanded view of the solidification material discharge pipe similar to FIG. 7, (b) is sectional drawing which follows the BB line of the same figure (a). It is a figure which shows the 3rd Embodiment of this invention, (a) is an expanded view of the solidification material discharge pipe similar to FIG. 7, (b) is sectional drawing which follows the CC line of the figure (a). Operation | movement explanatory drawing of the solidification material discharge pipe | tube shown in FIG. The longitudinal section explanatory drawing of the solidification material discharge pipe which provided the earth removal fin as the 4th Embodiment of this invention. The side view of FIG. Sectional drawing of the solidification material discharge pipe | tube shown in FIG. The expanded view of the solidification material discharge pipe | tube shown in FIG. The principal part bottom face explanatory drawing of the solidification material discharge pipe which shows the 5th Embodiment of this invention. FIG. 17 is a cross-sectional view of FIG. 16. Operation | movement explanatory drawing of the solidification material discharge pipe shown in FIG. It is a figure which shows the 6th Embodiment of this invention, (a) is a development view of a solidification material discharge pipe, (b) is sectional drawing which follows the DD line | wire of the solidification material discharge pipe shown to the same figure (a). . The disassembled perspective view of the solidification material discharge pipe | tube shown in FIG. The principal part assembly drawing of the solidification material discharge pipe shown in FIG. The partially broken perspective view of FIG. The front view which shows the modification of the stirring apparatus shown in FIG. The side view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Base machine 2 ... Arm 3, 3a ... Agitation device 4, 4a ... Discharge device 5, 5a ... Solidification material supply pipe 6, 6a ... Machine frame 8, 8a ... Post 9, 9a ... Hydraulic motor 10, 10a ... Drive sprocket DESCRIPTION OF SYMBOLS 11, 11a ... Drive chain 13, 13a ... Driven wheel 14, 14a ... Stirring blade 15, 15a ... Excavation blade 18 ... Fixed cylinder shaft 19 ... Rotating cylinder shaft 22 ... Solidification material discharge pipe (support shaft part)
23, 23a ... Solidified material feeding pipe 25, 25a ... Through hole 26, 26a ... Discharge hole 30 ... Soil fin 31 ... Band plate member 34 ... Nozzle piece

Claims (11)

Agitator that performs excavation and agitation processing of the ground for ground improvement, and a discharge that is attached to the agitation device and discharges solid or granular solid material into the soil in parallel with soil excavation and agitation processing A ground improvement machine equipped with a device,
The stirrer is provided with a drive sprocket rotatably at the upper part of the machine frame, and is configured as a double cylinder structure with a non-rotatable fixed cylinder shaft and a rotatable rotary cylinder shaft, and also serves as a solidified material discharge pipe A drive chain having a support shaft portion provided horizontally at the lower part of the machine frame, and a driven wheel paired with the drive sprocket fixed to the outer periphery of the rotating cylinder shaft, and a stirring blade provided between the drive sprocket and the driven wheel Wrap around
The discharge device forms at least one through-hole that opens on an outer peripheral surface of the fixed cylinder shaft that forms a solidification material discharge pipe together with the rotary cylinder shaft, and opens on the outer peripheral surface of the rotary cylinder shaft. In addition, at least one discharge hole that matches the through hole is formed in accordance with relative rotation with the fixed cylinder shaft, and further, solidified material supply pipes are connected to both ends of the fixed cylinder shaft, respectively. A ground improvement machine characterized in that the solidified material pumped from both ends thereof is discharged from discharge holes that match the through holes.   The solidified material pumping pipe introduced up to the discharge device is bifurcated into a solidified material supply tube, one solidified material supply tube at one end of the fixed cylindrical shaft, and the other solidified material supply tube at the fixed cylindrical shaft The ground improvement machine according to claim 1, wherein a loop-shaped solidification material supply path is formed by connecting to each of the other ends of the ground.   3. The ground improvement machine according to claim 1, wherein the through hole is provided in a range within 180 degrees on the lower side of the outer peripheral surface of the fixed cylinder shaft forming the solidified material discharge pipe.   One of the through holes and the discharge holes is a single circle, and the other is a long hole having the circumferential direction of the cylinder axis as a longitudinal direction. The ground improvement machine described. The ground improvement machine according to claim 4, wherein the through hole on the fixed cylinder shaft side has a single circular shape, and the discharge hole on the rotary cylinder shaft side has a long hole shape.   At least one through hole and a discharge hole are individually provided at both ends in the longitudinal direction of the fixed cylinder shaft and the rotating cylinder shaft forming the solidification material discharge pipe, and the through hole and the discharge hole are provided between the both ends in the longitudinal direction. The ground improvement machine according to claim 4 or 5, wherein the ground improvement machines are offset from each other in the circumferential direction.   The ground improvement machine according to any one of claims 4 to 6, wherein a nozzle piece for adjusting an opening area of the discharge hole is detachably attached to the rotating cylinder shaft.   The ground improvement machine according to any one of claims 1 to 7, wherein a band plate member made of an elastic material is bent and fixed to the through hole.   The ground improvement machine according to any one of claims 1 to 8, wherein a plate-like earth-extracting fin is provided on the outer periphery of the rotating cylinder shaft so as not to interfere with the discharge hole.   The fixed cylinder shaft constitutes an inner cylinder of a support part of a double cylinder structure that also serves as a solidification material discharge pipe, and the rotary cylinder axis constitutes an outer cylinder of a support part of the double cylinder structure The ground improvement machine according to any one of claims 1 to 9, wherein   The ground improvement machine according to any one of claims 1 to 10, wherein the agitation device is a construction machine as a base machine and is attached to an arm tip of the construction machine.

Images