JP2012036604A - Agitating and mixing machine in soil improving machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of the conventional agitating and mixing machine in which: agitation mixing is insufficient especially at a drilling end and a degree of ground improvement is uneven when only a drilling and agitation blade is used.SOLUTION: An endless drive chain 5 is wound around between a drive sprocket 3 at the upper end of a column 2 and a driven sprocket 4 at the lower end of the column 2, a plurality of drilling and agitation blades 6, 6a... are disposed and mounted at every prescribed interval on the drive chain 5 to circulate and move the drilling and agitation blades 6, 6a... together with the drive chain 5, and rotary agitation means 8 provided with a rotary agitation blade 7 disposed so as to be rotated at least on one side face side of the column 2 is disposed near the lower end side of the column 2. By performing agitation and mixing at a drilling end by the rotary agitation blade 7 as well, roughly equal agitation mixing is made possible even when the agitating and mixing machine 1 cannot be horizontally moved without being pulled up.

Description

  The present invention relates to a so-called trencher type stirring mixer in which a drilling stirring blade mounted on an endless drive chain is moved together with the drive chain in a ground improvement machine.

  Conventionally, for example, in a ground improvement machine used to harden the ground before foundation construction, an endless drive chain is wound between a drive sprocket at one end of the shaft column and a driven sprocket at the other end of the shaft column. A trencher-type agitator / mixer, in which a plurality of excavator agitating blades are attached to the drive chain at a predetermined pitch and the excavator agitator blades move around with the chain, is attached to the tip of the arm of a base machine of a construction machine such as a backhoe. The excavator and the agitating blade are excavated on the tip side of the agitating mixer by pushing down the agitating mixer with the thrust of the base machine in a state where each excavating agitating blade is moved around together with the drive chain. At the same time, the excavated soil and the solidified material discharged from the tip of the shaft column are agitated and mixed in the excavation hole by the excavating agitating blade in the agitation mixer embedded in the ground. And it is (for example, see Patent Document 1).

Japanese Patent No. 4365390

  However, in the above prior art, the agitation end can only be agitated and mixed at the excavation end with the excavation agitation blade passed at the time of excavation. Since the agitation and mixing can be performed by the excavation stirring blade that has passed through, the sufficient agitation and mixing cannot be performed at the deepest part when the predetermined excavation depth is reached. If it does not move in the horizontal direction as it is when it reaches the predetermined excavation depth, it cannot be mixed without gaps, but as the excavation depth increases, the underground resistance acting on the agitator / mixer increases and the horizontal direction remains unchanged. Therefore, it is impossible to move horizontally unless the ground resistance is lowered by lifting the stirring mixer by about half, so stirring mixing in the lower layer without horizontal movement is extremely difficult. Eliminated, such as the density of the improvement degree in the result improvement has been ground becomes large, there is a problem that must be solved.

  The present invention is based on the above-described prior art, and in view of the problem that the agitation mixing on the excavation end side becomes insufficient with the excavation stirring blade alone and the degree of improvement becomes coarse, the drive sprocket at the upper end of the axial column and the lower end of the axial column An endless drive chain is wound between the driven sprocket and a plurality of excavation stirring blades are arranged and attached to the drive chain at predetermined intervals, and the excavation stirring blades are moved around with the drive chain. By arranging a rotary stirring means having a rotary stirring blade disposed rotatably on at least one side surface of the shaft column near the lower end side of the shaft column, and stirring mixing at the excavation end is also performed by the rotary stirring blade, The above problem is solved by enabling substantially uniform stirring and mixing even if the stirring and mixing machine cannot be moved horizontally without being lifted.

In short, the present invention wraps an endless drive chain between the drive sprocket at the upper end of the shaft column and the driven sprocket at the lower end of the shaft column, and a plurality of excavation stirring blades are arranged and mounted on the drive chain at predetermined intervals. The excavating stirring blade is moved around together with the drive chain, and a rotary stirring means having a rotating stirring blade rotatably disposed on at least one side surface of the shaft column is disposed near the lower end side of the shaft column. As a result, the excavated soil can be agitated and mixed in the portion of the drive chain in the process of passing the rotating agitating blade in the rotationally driven state, so that the agitating and mixing can be performed more efficiently and evenly. When it reaches the excavation depth, it can be sufficiently stirred and mixed without moving the stirring mixer horizontally, so it can be lifted immediately or at least shorten the stop time. Theft is possible, therefore it is possible to shorten the time required for the improvement work.
Furthermore, since the rotary agitating blade is driven to rotate in the direction opposite to the direction of rotation of the drive chain, the excavation soil is pushed in and moved backward at the excavation end, that is, the downward movement site of the drive chain. It works so as to prevent the lift of excavated soil generated at the part, that is, the upper moving part, with the rotary stirring blade in the rotational drive state, so that the movement of the excavated soil becomes complicated and more uniform stirring and mixing can be performed, etc. The effect is great.

It is a side view of Example 1 of the stirring mixer in the ground improvement machine which concerns on this invention. It is a front view of the stirring mixer of FIG. It is a principal part enlarged view of the AA cross section of FIG. It is a side view of Example 2 of the stirring mixer in the ground improvement machine which concerns on this invention. It is a principal part enlarged view of the BB cross section of FIG. It is sectional drawing which shows the perfect penetration state to the ground of a stirring mixer. It is sectional drawing which shows the state which moved the stirring mixer to the horizontal direction, with substantially half penetrated. It is sectional drawing which shows the state which made the stirring mixer fully penetrate after a horizontal movement.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
In a ground improvement device for the purpose of excavating the ground and stirring and mixing the soil and solidified material, a base machine (not shown) such as a backhoe, which is a construction machine, and a tip of the base machine arm. It comprises a trencher type stirring mixer 1 according to the present invention that is detachably mounted.

In the stirring mixer 1, basically, a substantially prismatic cylindrical column 2, a drive sprocket 3 provided at the upper part of the shaft 2, and a driven sprocket 4 provided at the lower part of the shaft 2, , An endless drive chain 5 wound between the drive sprocket 3 and the driven sprocket 4, a plurality of excavation stirring blades 6, 6 a... Detachably mounted on the outer periphery of the drive chain 5, and the shaft column 2. And a rotary stirring means 8 having a rotary stirring blade 7 disposed on at least one side of the shaft column 2 at least on the lower end side.
The drive chain 5 is guided by a plurality of carrier rollers 9, 9 a... Provided on the front and back surfaces of the shaft column 2 so as to secure a distance from the shaft column 2 and stably circulate. ... has a substrate disposed at right angles to the drive chain 5 and a plurality of cutter blades integrated in parallel in the length direction on the outer surface of the substrate.
Further, a solidifying material discharge device 10 is provided at the lower end of the shaft column 2, and the solidifying material discharge device 10 is, for example, a powder that has been pressure-fed through a discharge pipe (not shown) by a grout pump or the like (not shown). Or slurry-like solidification material is discharged.

1 to 3 are a side view, a front view, and an enlarged view of a main part of the AA cross section of FIG. 1 of Example 1 of the agitating mixer 1. The means 8 is disposed only near the lower end side of the shaft column 2, and the rotary stirring unit 8 has the rotary stirring blades 7 and 7 a and the rotary stirring blades 7 and 7 a that pass through the shaft column 2 at both projecting ends. And a driving means for the shaft body 11.
In the drive means, a drive motor 12 disposed on the upper end side of the shaft column 2 and driven to rotate in a direction opposite to the direction of rotation of the drive chain 5, and protrudes into the shaft column 2 in the drive motor 12. A sprocket 13 attached to the drive shaft 12a, a sprocket 14 attached to the shaft body 11, and an endless chain 15 wound between the sprockets 13 and 14, and rotated by the drive motor 12. The stirring blades 7 and 7a are driven to rotate.
Each of the rotary stirring blades 7 and 7a includes a rotary plate 16 fixed to the shaft body 11, and a plurality of stirring plates 17 and 17a that protrude outward from the outer peripheral side of the rotary plate 16. have.

4 and 5 are a side view of Example 2 of the stirring mixer in the ground improvement machine according to the present invention and an enlarged view of a main part of the BB cross section of FIG. The rotary stirring means 8 and 8a of the machine are arranged at the lower end side of the shaft column 2 and the upper intermediate position thereof, and each of the rotary stirring means 8 and 8a is the same as the rotary stirring blade in the first embodiment. 7, 7 a, a shaft body 11 that passes through the shaft column 2 and has rotary stirring blades 7, 7 a mounted on both projecting ends thereof, and a drive means for the shaft body 11.
In the drive means, a drive motor 12 disposed on the upper end side of the shaft column 2 and driven to rotate in a direction opposite to the direction of rotation of the drive chain 5, and protrudes into the shaft column 2 in the drive motor 12. Sprockets 13 and 13a mounted on the drive shaft 12a, the shaft body 11 in the lower rotary stirring means 8, the sprockets 14 and 14a mounted on the shaft body 11 in the upper rotary stirring means 8a, and the sprockets 13 and 14 And endless chains 15 and 15a wound between the sprockets 13a and 14a, and the drive motor 12 rotates the rotary stirring blades 7 and 7a of the rotary stirring means 8 and 8a.

  Although not shown, one sprocket for the drive motor 11, two sprockets for the shaft body 10 in the upper rotary stirring means 8 a, and one sprocket for the shaft body 10 in the lower rotary stirring means 8, respectively. At the same time, the drive motor 11 has a chain between one sprocket and one sprocket of the upper rotary stirring means 8a, and between the other sprocket of the upper rotary stirring means 8a and the sprocket of the lower rotary stirring means 8. Alternatively, the rotary agitating means 8 and 8a may be wound independently or may be independently driven by being equipped with a drive motor.

  Further, the rotary stirring means 8 in Example 1 and the rotary stirring means 8 and 8a in Example 2 are provided with two rotary stirring blades 7 and 7a on both side surfaces of the shaft column 2. One piece may be arranged only on one side, and two rotary stirring means 8 and 8a are provided in the second embodiment, but three or more may be used. The lowermost rotary stirring means must be arranged near the lower end side of the shaft column 2.

Next, the operation of the stirring mixer in the ground improvement machine according to the present invention will be described.
When the drive motor 20 of the drive sprocket 3 provided on the upper part of the shaft column 2 is started, each excavation stirring blade 6, 6a... Moves together with the drive chain 5, and the drive motor 11 is started to rotate. In the process in which the agitating mixer 1 in a state where the blades 7 and 7a are rotationally driven is inserted into the ground W by a base machine (not shown), the ground W is excavated, and the excavated soil and solidified material discharging device 10 is excavated. In the formed excavation hole X, the solidified material discharged from the agitator is agitated and mixed by the excavating agitating blades 6, 6a... And the rotating agitating blades 7, 7a. 5 and the inner part of the excavated soil is mixed, and when the predetermined depth H is reached as shown in FIG. 6 (a), as shown in FIG. First, it is lifted by about H / 2 in the driving state, then it is a predetermined dimension As shown in FIG. 6 (c), repeated penetration to a predetermined depth H and excavation / stirring / mixing in the entire lateral direction are repeated, and the steps up to this point are sequentially repeated in an untreated location. If the entire designated area is excavated, stirred and mixed, and then cured and solidified, the ground strength in the designated area will be improved.

  In the step shown in FIG. 6 (a), the stirring and mixing at the excavation end when the predetermined depth H is reached includes not only the excavation stirring blades 6, 6a, but also the rotary stirring blades 7 in the rotary stirring means 8, Since the agitation is also performed at 7a, sufficient agitation and mixing are performed simultaneously with excavation, so that the agitation mixer 1 can be lifted without taking time after reaching the predetermined depth H.

  In addition, by rotating the rotating agitating blades 7 and 7a in the direction opposite to the direction of rotation of the drive chain 5, the excavating soil is pushed in and the upper moving part is generated in the lower moving part of the drive chain 5 at the excavation end. It works to prevent the excavated soil from lifting, and the movement of the excavated soil becomes complicated, resulting in more uniform agitation and mixing.

However, in the process shown in FIG. 6 (b), the lifting distance is about half of the excavation depth, but it is not limited to such a ratio, and it is determined by the quality of the ground W and the depth of the excavation hole X, If the excavation hole X is shallow, it may not be necessary to lift it.
6 (a) to 6 (c), the excavation hole X is blank without hatching, but it is for the sake of easy understanding. Filled.

  Further, the conductivity of the mixed and agitated soil is measured, and when the measured value reaches the set value, the confirmation means that the mixed agitation is completed is installed in the agitation mixer 1, and the completion confirmation means A detection sensor (not shown) may be installed on the lower end side of the shaft column 2, specifically between the rotary stirring means 8 and the driven sprocket 4 to measure the conductivity as needed during the work.

DESCRIPTION OF SYMBOLS 1 Stirring mixer 2 Shaft pillar 3 Drive sprocket 4 Driven sprocket 5 Drive chain 6, 6a ... Excavation stirring blade 7, 7a Rotary stirring blade 8 Rotary stirring means

Claims (2)

A trencher type stirring mixer to be attached to the tip of an arm of a base machine in a ground improvement machine,
An endless drive chain is wound between the drive sprocket at the upper end of the shaft column and the driven sprocket at the lower end of the shaft column, and a plurality of excavation agitating blades are mounted on the drive chain at predetermined intervals, and the excavation agitation is performed. The blade is moved around together with the drive chain, and a rotary stirring means having a rotary stirring blade disposed rotatably on at least one side surface of the shaft column is disposed near the lower end side of the shaft column. Stir mixer.   2. The agitation mixer according to claim 1, wherein the rotary agitating means is configured such that the rotary agitating blade is rotationally driven in a direction opposite to a rotating direction of the drive chain.

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