JP3757093B2 - Stir mixing device for ground improvement - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an agitation and mixing device for ground improvement, and more particularly to an agitation and mixing device used for ground improvement of a surface layer portion of the ground, which is called an ultra-soft ground such as a wetland area, a reclaimed land, and a tidal flat.
[0002]
[Prior art]
As a ground improvement method for the surface layer of the ground such as wetland, dredged land, and tidal flats, solidification materials such as cement and lime are agitated and mixed with the ultra-soft ground to solidify the mixture. There is a ground improvement method that improves the properties.
[0003]
An example of the stirring and mixing apparatus used in this type of construction method is disclosed in, for example, Japanese Patent Application Laid-Open No. 8-144262. The stirring and mixing apparatus disclosed in this publication includes a stirring and mixing unit that stirs an ultra-soft ground, and a solidifying material supply unit that supplies a solidifying material while stirring the ultra-soft ground in the stirring and mixing unit.
[0004]
The stirring and mixing unit includes a plurality of rows of chains that circulate in the vertical direction, a drive unit that simultaneously drives the plurality of rows of chains to rotate, and a plurality of stirring plates attached to each chain.
[0005]
However, the ground improvement stirring and mixing apparatus configured as described above has technical problems described below.
[0006]
[Problems to be solved by the invention]
That is, in the stirring and mixing apparatus having the above-described configuration, the number of rows of chains is set in accordance with the width of ground improvement, so it is necessary to manufacture a device according to the improved width each time.
[0007]
Also, depending on the soil conditions, the chain and the mixed soil may cause rotation, preventing uniform improvement. In such a case, a structure in which multiple rows of chains are driven at the same time can be effectively dealt with. I couldn't.
[0008]
Furthermore, in the structure in which the chains are arranged in a row and the whole is driven by a single drive unit, if the improvement width for one row is increased, a larger drive unit is required and the weight of the device becomes too large. Therefore, it has been difficult to increase the improvement width.
[0009]
The present invention has been made in view of such conventional problems, and the object of the present invention is to provide a ground that can ensure a necessary improvement width easily and at a low cost, and can make a homogeneous improvement. It is to provide an improved stirring and mixing apparatus.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides an agitation and mixing unit for agitating ultra-soft ground such as wetlands, dredged land, and tidal flats, and a solidification material while agitating the ultra-soft ground in the agitation and mixing unit. In the ground improvement stirring and mixing apparatus provided with the solidifying material supply section to be supplied, the stirring and mixing section includes a chain that circulates in a vertical direction, a drive section of the chain, and a plurality of stirring sections attached to the chain. A unit having a plate, and a plurality of the unitized stirring and mixing sections are connected in a horizontal direction and arranged in a row.
According to the ground improvement stirring and mixing device configured in this way, the stirring and mixing unit is unitized, and a plurality of unitized stirring and mixing units are arranged in a row by connecting them in the horizontal direction. The width can be arbitrarily set by increasing or decreasing the number of units.
In addition, since the unit has a chain that circulates in the vertical direction, a drive unit for the chain, and a plurality of stirring plates attached to the chain, the structure is simplified and the weight of the apparatus can be reduced.
In this case, even if the improvement width for each unit is increased, the drive unit that circulates the chain to which the stirring plate is attached is provided individually, so that the size is not increased so much.
Furthermore, in the present invention, the rotation direction and the number of rotations of the chain can be set independently and freely in each unit, so that the chain and the mixed soil do not cause rotation, and an equal improvement can be achieved. It can be carried out.
The agitation / mixing unit is disposed so as to be orthogonal to the circumferential direction of the chain, and tension rollers provided at both ends abut against the chain and slide according to the tension fluctuation of the chain, and the tension A jack may be provided that urges the rollers to separate the chains from each other.
According to this configuration, even when an unbalanced load is applied when any of the agitation plates attached to the chain agitates the ultra-soft ground, this deviation is caused by the sliding movement of the tensioner and the biasing force of the jack. The load is relaxed.
The stirring and mixing unit includes a driving sprocket wheel provided on the upper end side of the chain that circulates, an idler roller provided on the lower end side of the chain, and a pair of auxiliary members provided on both sides coaxially with the idler roller. The stirring plate is extended in a direction perpendicular to the traveling direction of the chain, and the auxiliary roller supports the stirring plate that sequentially reaches the lower end side as the chain circulates. Can do.
According to this configuration, the support state of the stirring plate is stabilized on the lower end side of the circulating circulation of the chain that contributes most to the excavation and stirring of the soft ground, and uneven wear and wheel removal are effectively prevented.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. 1 to 4 show an embodiment of a ground improvement stirring and mixing apparatus according to the present invention. The agitating and mixing apparatus shown in the figure supplies an agitating and mixing unit 10 for agitating ultra-soft ground such as wetlands, dredged land, and tidal flats, and supplying solidified material C while agitating and mixing the ultra-soft ground in the agitating and mixing unit 10 The solidifying material supply unit 12 and the support unit 14 are provided.
[0012]
The stirring and mixing unit 10 includes a frame 15, a chain 16, a hydraulic drive motor 18 (drive unit), and a stirring plate 20, and is unitized. In the case of the present embodiment, three units of the stirring and mixing unit 10 having the same configuration are arranged in a horizontal row.
[0013]
A drive motor 18 is supported on the upper side of the frame 15. In addition, a roller support member 22 having a substantially triangular side surface is fixed to the lower side of the frame 15.
[0014]
The roller support member 22 is formed in an isosceles triangle shape on the side surface, the apex located between the pair of equilateral sides is on the longitudinal axis of the frame 15, and the base connecting the remaining two apexes is the frame 15. It is arranged in a direction perpendicular to the longitudinal axis. The roller support member 22 having such a shape is provided with a pair of idle rollers 24 rotatably arranged on two equal sides. A pair of small-diameter guide rollers 26 is rotatably installed on the two vertex sides located at both ends of the bottom side of the roller support member 22. Further, the roller support member 22 is formed with an insertion hole 27 that penetrates in a direction orthogonal to the longitudinal direction of the frame 15.
[0015]
The chain 16 is circulated endlessly with a guide roller 26 interposed between a driving sprocket wheel 28 fixed to the rotating shaft of the drive motor 18 and a pair of idler rollers 24.
[0016]
The circumferential state of the chain 16 is centered on the central axis in the longitudinal direction of the frame 15, and the diameter of the driving sprocket wheel 28 is smaller than the outer peripheral interval of the pair of idler rollers 24 or guide rollers 26. The interval between the chains 16 circulated between them is narrowed on the side of the driving sprocket 28, and the tensioner 30 is installed close to the driving sprocket wheel 28 so as to correspond to the position of this portion. .
[0017]
The tensioner 30 of this embodiment has a pair of tension rollers 32, a slide rod 34 on which the tension roller 32 is rotatably supported at both ends, and both ends into which the slide rod 34 is movably fitted and inserted. And a sleeve 36.
[0018]
The slide rod 34 is disposed so as to be orthogonal to the circumferential direction of the chain 16, and the tension rollers 32 provided at both ends are disposed so as to contact the chain 16, respectively.
[0019]
The sleeve 36 is supported by the frame 15 via an expandable bellows member 38. Further, the expansion / contraction end of the jack 40 is coupled to one end of the sleeve 36.
[0020]
The jack 40 is installed in the frame 15 and always urges the sleeve 36 upward. In this biased state, the slide rod 34 is inserted into the sleeve 36, and tension rollers 32 that contact the chain 16 are provided at both ends of the slide rod 34. At the part where the roller 32 is in contact, it is acting so as to be separated from each other.
[0021]
In the vicinity of the frame 15 where the jacks 40 are installed, a pair of joining flanges 41 are provided at opposing positions in order to connect the units of the stirring and mixing unit 10 installed in a row.
[0022]
The stirring plate 20 is provided with a plurality of substantially the same configurations, and is attached to the chain 16 at a predetermined interval. In the case of the present embodiment, each stirring plate 20 includes a plate-like plate portion 20a, a pair of protrusions 20b that are protruded and fixed on the upper surface of the plate portion 20a at a predetermined interval, and a plate portion. And a mounting portion 20c fixed to the lower surface of 20a.
[0023]
In the case of the present embodiment, the installation interval between the pair of protrusions 20 b is set to be slightly different depending on each stirring plate 20.
[0024]
The length of the plate portion 20a corresponds to the improved width of the stirring and mixing unit 10 of one unit, and is about 800 mm in this embodiment. The attachment portion 20c is at the center in the longitudinal direction of the plate portion 20a and is locked to the chain 16.
[0025]
In FIG. 1, a pair of auxiliary rollers 42 are coaxially provided on both sides of the idler roller 24 so as to be rotatable. FIG. 1 shows only the auxiliary roller 42 arranged on the one idler roller 24 side, but the other idler roller 24 arranged below the idler roller 24 in FIG. 1 has the same configuration. A pair of things are arranged.
[0026]
On the other hand, the solidifying material supply unit 12 includes two first and second supply pipes 12a and 12b. The first supply pipe 12 a disposed above the stirring and mixing unit 10 is bent in an L shape, and the bent tip portion extends in the vicinity of the tensioner 30 of the stirring and mixing unit 10.
[0027]
A discharge port (indicated by an arrow in FIG. 1) of the solidifying material C is provided at a position where the end of the first supply pipe 12a extends to sandwich the frame 15 of each stirring and mixing unit 10.
[0028]
The second supply pipe 12b disposed above the stirring and mixing unit 10 is bent in an L shape, and the bent tip portion extends so as to pass between the floating rollers 24 of the stirring and mixing unit 10. It is installed.
[0029]
A discharge port (indicated by an arrow in FIG. 1) of the solidified material C is provided in the vicinity of the auxiliary roller 42 at the distal end extending portion of the second supply pipe 12a. Further, the second supply pipe 12b is provided with a branch pipe 12c at a position corresponding to the first supply pipe 12a, and this branch pipe 12c is opposed to the tip extending portion of the first supply pipe 12a. The discharge port for the solidified material C is provided in the vicinity of the tensioner 30 and at substantially the same position as the extended end portion of the first supply pipe 12a.
[0030]
On the other hand, the support portion 14 of the present embodiment includes a fixed frame 14a, an outer cover 14b, a connecting flange 14c, and a connecting rod 14d. The fixed frame 14a is formed in a square cross section, and both ends are fixedly provided on the upper ends of the pair of outer covers 14b.
[0031]
The pair of outer covers 14b are arranged on both sides of the three units of the stirring and mixing unit 10 arranged in three rows, and the joining flanges 41 of the stirring and mixing units 10 arranged on both ends are respectively connected to the outer cover 14b. It is connected with bolts and nuts.
[0032]
Both ends of the connecting flange 14c are connected by bolts and nuts between the joint flanges 41 of the three units of the stirring and mixing unit 10 arranged in three rows. In the present embodiment, two connecting flanges 14c are used.
[0033]
The connecting rod 14d is inserted into an insertion hole 27 formed through the roller support member 22 of the three units of the stirring and mixing unit 10 arranged in three rows, and is locked by pinning both ends to the outer cover 14b. Has been.
[0034]
In addition, when increasing or decreasing the number of units of the stirring and mixing unit 10 in the apparatus of the present embodiment, the outer cover 14b, the connecting flange 14c, and the connecting rod 14d are removed, and the number of connecting flanges 14c according to the number of units, A connecting rod 14d having a length corresponding to the number of units may be used.
[0035]
The stirring and mixing apparatus configured as described above is used for ground improvement by attaching the upper end side of the outer cover 14b to a multi-band mobile base machine, like this type of conventional apparatus soil.
[0036]
When improving ultra-soft ground such as wetlands, dredged land, and tidal flats, the drive motor 18 of each unit is driven to rotate, the chain 16 is circulated, and the agitation locked to the chain 16 is performed. While the ground is being stirred by the plate 20, the solidified material C is supplied to the ground via the solidified material supply unit 12, and these are mixed and the solidified material C is solidified to improve the ground properties.
[0037]
At this time, the following effects are exhibited in the apparatus of the present embodiment. That is, first, in the stirring and mixing apparatus of the present embodiment, the stirring and mixing unit 10 is unitized, and a plurality of unitized stirring and mixing units 10 are connected in the horizontal direction and arranged in a row, so that the entire apparatus is improved. The width can be arbitrarily set by increasing or decreasing the number of units.
[0038]
The stirring and mixing unit 10 is a unit having a chain 16 that circulates in the vertical direction, a drive motor 18 that circulates the chain 16, and a plurality of stirring plates 20 that are attached to the chain 16, so that the structure is simple. Thus, the weight of the apparatus can be reduced.
[0039]
Furthermore, in this embodiment, the rotation direction and the number of rotations of the chain 16 can be set independently and freely in each unit, so that the chain 16 and the mixed soil are not caused to rotate and are evenly distributed. Improvements can be made.
[0040]
In the case of the present embodiment, the stirring and mixing unit 10 is arranged so as to be orthogonal to the circumferential direction of the chain 16, and tension rollers 32 provided at both ends abut against the chain 16, and the tension of the chain 16 is increased. The tensioner 30 slides in accordance with the fluctuation, and the tension roller 32 has a jack 40 that urges the chain 16 away from each other.
[0041]
For this reason, for example, when an eccentric load acts on the stirring plate 20 and the tension increases on one side of the chain 16, the sliding movement is performed so that the tension roller 32 on this side protrudes as shown by the phantom line in FIG. 2. To relieve tension fluctuations.
[0042]
Further, since the tension roller 32 urges the chain 16 by the jack 40 so as to separate the chain 16 from each other, the tension of the entire chain 16 is always kept constant.
[0043]
Therefore, even when an unbalanced load is applied when agitation is applied to any of the agitation plates 20 attached to the chain 16, this deviation is caused by the sliding movement of the tensioner 30 and the biasing force of the jack 40. The load is relaxed.
[0044]
Furthermore, in the case of the present embodiment, a pair of auxiliary rollers 42 that support the stirring plate 20 from below are provided on the lower end side of the circular movement of the chain 16. That is, the auxiliary roller 42 of this embodiment contacts the lower surface side of the plate portion 20a of each stirring plate 20 when the stirring plate 20 attached to the chain 16 circulates by driving of the drive motor 18. I support this.
[0045]
For this reason, the stirring plate 20 is a portion where the auxiliary roller 42 is provided, that is, the lower end side of the circular running of the chain 16, and the central portion of the plate portion 20 is supported by the chain 16. It is supported by the auxiliary roller 42 at a point.
[0046]
Accordingly, the support state of the stirring plate 20 is stabilized particularly on the lower end side of the circular running of the chain 16 that contributes most to excavation and stirring of soft ground, and uneven wear and wheel removal are effectively prevented.
[0047]
【The invention's effect】
As described above in detail in the examples, according to the ground improvement stirring and mixing apparatus according to the present invention, a necessary improvement width can be secured easily and inexpensively, and a homogeneous improvement can be performed.
[Brief description of the drawings]
FIG. 1 is a front view showing a position example of a ground improvement stirring and mixing apparatus according to the present invention.
FIG. 2 is a side view of FIG.
FIG. 3 is a cross-sectional view taken along line AA in FIG.
4 is a cross-sectional view taken along line BB in FIG. 1. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Agitation mixing part 12 Solidification material supply part 14 Support part 15 Frame 16 Chain 18 Drive motor 20 Stirring plate 22 Roller support material 24 Idle roller

Claims (3)

Ground improvement comprising an agitation and mixing unit for agitating ultra-soft ground such as wetlands, dredged land, and tidal flats, and a solidifying material supply unit for supplying the solidified material while agitating the ultra-soft ground in the agitation and mixing unit. In the stirring and mixing device for
The stirring and mixing unit is a unit having a chain that circulates in the vertical direction, a drive unit of the chain, and a plurality of stirring plates attached to the chain,
A ground mixing improvement stirring and mixing device, wherein a plurality of the unitized stirring and mixing portions are connected in the horizontal direction and arranged in a row. The stirring and mixing unit is arranged so as to be orthogonal to the circumferential direction of the chain, tension rollers provided at both ends abut against the chain, and a tensioner that slides according to the tension fluctuation of the chain,
2. The ground improvement stirring and mixing device according to claim 1, wherein the tension roller has a jack for urging the chain to be separated from each other. The stirring and mixing unit includes a driving sprocket wheel provided on the upper end side of the chain that circulates, an idler roller provided on the lower end side of the chain, and a pair of auxiliary members provided on both sides of the idler roller. With rollers,
The stirring plate is extended in a direction orthogonal to the running direction of the chain,
3. The ground improvement stirring and mixing device according to claim 1 , wherein the auxiliary roller supports the stirring plate that sequentially reaches the lower end side as the chain circulates .

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