JPH0624415Y2 - Auger used to form the soil mountain stop wall - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to an auger used for forming a soil retaining wall, and more particularly, to an auger used for forming a soil retaining wall having a stirring blade connected to a stirring surface of a stirring blade to improve stirring performance.

[Prior art]

Excavators for forming conventional soil pile retaining walls include:
(A) There is a type of auger that uses a rotary shaft with a screw provided around it, and (b) a type of auger that uses a rotary shaft having a plurality of stirring blades with a constant inclination (rake) angle in the longitudinal direction. (C) A ridge for forming an exhaust gas passage for the powder transport gas is provided on the outer periphery of the hollow rotary shaft to be inserted into the ground, and a member having an arc-shaped cross section is provided below the hollow rotary shaft. Two stirring blades are provided in the radial direction, and the powder jet nozzles are arranged inside the arcuate portion of each stirring blade, and each powder jet nozzle is fixed to the lower part of the hollow rotary shaft. A ground improvement device is proposed in which two secondary claw-shaped secondary stirring blades are provided outward and inward on the arcuate surface on the upper side of the ground (JP-A-57-6841).
No. 8).

[Problems to be solved by the device]

The excavator of (a) can transport excavated soil, but has insufficient agitation action, and it is necessary to dispose the screw over the entire length of the rotating shaft substantially equal to the excavated length. . Further, the excavator of (b) can also carry excavated earth and sand, but its stirring action is insufficient. With a stirring blade with a constant inclination angle, stirring was performed only in the vertical direction (direction perpendicular to the longitudinal direction of the stirring blade), and sufficient stirring could not be performed.
Therefore, a large number of stirring blades are required, and it is necessary to increase the length of the portion of the rotating shaft on which the stirring blades are arranged. Further, in the ground improvement device of (C), since two planar claw-shaped secondary stirring blades are fixed outward and inward in the arcuate portion on the upper side of the stirring blade, the hollow rotating shaft rotates to The agitation action of the secondary agitation blade and the agitation action of the ridges provided on the hollow rotary shaft have the function of forming an exhaust gas passage for the transport gas jetted together with the powder from the powder jet nozzle around the rotary shaft. Since the claw-shaped secondary stirring blade has an arcuate upper side, it has a small function of moving earth and sand or the like upward or downward during stirring, and the shape of the stirring blade and the secondary stirring blade is complicated. There is a drawback that it is difficult to attach the secondary stirring blade to the circular arc surface of the stirring blade. In the conventional excavator described above, since the portion of the rotary shaft where the screw or the stirring blade is disposed is long, when the rotary shaft is pulled up, if the excavated soil adheres to the screw or the stirring blade, The earth and sand may fall and fall on workers, and the earth and sand may be scattered on roads and neighboring houses, causing trouble to third parties. For this reason, it was necessary to extend the temporary enclosure at the construction site upwards and stretch the curing sheet high so as not to bother third parties. Further, since the excavated earth and sand attached to the screw and the stirring blade adversely affects the construction efficiency of the next excavation, it is necessary for the worker to clean it with a jet washer or the like. However, the conventional excavator described above has a drawback in that the rotating shaft portion on which the screw or the stirring blade is disposed is long, and it takes time and labor to clean it. Then, when forming the soil pile retaining wall, it is necessary to sufficiently mix the mixture of excavated soil and water-stopping liquid (that is, cement milk, soil milk, etc.) (hereinafter referred to as sediment, etc.). In such a conventional excavator, since the stirring performance of the auger is insufficient, it takes a long time to stir, which also causes the water leakage of the soil retaining wall due to poor stirring. The problem to be solved by the invention of this application is to provide an auger used for forming a soil pile retaining wall that does not have the above-mentioned drawbacks of the prior art, in other words, the number of stirring blades is improved by improving the stirring performance of the stirring blade. It is an object of the present invention to provide an auger used for forming a soil ridge retaining wall in which the length of the portion of the rotating shaft on which the stirring blade is provided can be shortened by reducing the amount of water.

[Means for Solving the Problems] The present invention adopts the following configuration as means for solving the above problems. The structure of the present invention is an auger equipped with a rotating shaft, an excavating head provided at the lower end of the rotating shaft, and a plurality of stirring blades fixed to the rotating shaft above the excavating head at intervals in the axial direction. , A stirring blade composed of a plate-shaped body is fixed to the rotating shaft with an inclination angle, and at least one stirring blade composed of a rod-shaped body or a plate-shaped body is arranged on the flat stirring surface of each stirring blade. An auger used for forming a soil retaining wall is characterized in that the stirring blade is connected to the stirring blade such that the axis of the direction and the longitudinal axis of the stirring blade intersect at an acute angle. The stirring blade is composed of a plate-like body, and is fixed to the rotating shaft with an inclination (rake) angle. In a preferred embodiment, the stirring blade is formed of a plate-shaped body having a substantially rectangular cross section and fixed to the rotating shaft with a constant inclination (rake) angle, but the inclination angle may not be constant. As the stirring blade, for example, a rod-shaped body or a plate-shaped body having a rectangular cross section is used. It is also possible to make the surface of the stirring blade on which the earth or sand hits a curved surface so that the earth and sand hitting this surface can be easily inverted. At least one stirring blade is fixed to each stirring blade. The stirring blade is provided on the flat stirring surface of the stirring blade so as to project from the stirring surface so that the moving direction of earth and sand can be changed. The stirring blade is fixed to the stirring blade such that the longitudinal axis of the stirring blade intersects the longitudinal axis of the stirring blade at an acute angle. The sharp angle is that the sand and sand (object to be agitated) that hits the agitating surface by the agitating blade at the time of agitating is most efficiently corresponding to the geological condition, and the direction perpendicular to the longitudinal axis of the agitating blade (that is, , The vertical direction) and the angle that can be converted to a direction other than the vertical direction. However, an angle at which the rotation resistance of the stirring blade becomes too large is not practical.

[Action]

The auger used for forming the soil pile retaining wall of the present invention comprises a rotary shaft, a drilling head provided at the lower end of the rotary shaft, and a plurality of rotary shafts fixed to the rotary shaft above the drilling head at intervals in the axial direction. In an auger equipped with a stirring blade, a stirring blade composed of a plate-shaped body is fixed to a rotary shaft with an inclination angle, and at least one stirring blade composed of a rod-shaped body or a plate-shaped body is provided on a flat stirring surface of each stirring blade. The stirring blades are connected to the stirring blades so that the longitudinal axis of the stirring blades intersects with the longitudinal axis of the stirring blades at an acute angle. However, by changing the direction of the sediment, water-stopping liquid, etc. to the direction (vertical direction) at right angles to the axis of the stirring blade, the stirring blades connected to each stirring blade make the sediment, water-stopping liquid, etc. on the axis of the stirring blade. To change the direction to the direction other than the right angle (oblique lateral direction) These redirecting are combined, sediment in the borehole, the agitation state of the waterproofing fluid, etc. is greatly improved,
The stirring performance of the stirring blade attached to the rotary shaft can be improved. Further, in the device of the present invention, a stirring blade made of a rod-shaped body or a plate-shaped body is provided on the flat stirring surface of the stirring blade made of a plate-shaped body with a longitudinal axis of the stirring blade and a longitudinal axis of the stirring blade. Since they are connected to each other at an acute angle, the structure of the stirring blade and the stirring blade can be simplified, and the stirring blade can be easily connected to the stirring blade. You can easily make an auger.

【Example】

An embodiment of this invention will be described with reference to FIGS. In FIG. 1 and FIG. 2, 1 is a rotary shaft (auger rod) of the auger, 2 is a lower part of the rotary shaft 1,
A head cutter 3 is provided at the center of the lower portion 2. Rotating shaft 1
The supporting member 4 is fixed to the left and right of the supporting member 4 so as to project rightward and leftward, and the auger bit (excavation claw) 5 is attached to the supporting member 4 downward. The head cutter 3, the support member 4, and the auger bit 5 described above constitute an excavation head. A plurality of stirring blades 6 are attached to the lower part of the rotary shaft 1 on the upper side of the support member 4. Each stirring blade 6 is formed of a plate-shaped body having a substantially rectangular cross section, is fixed to the rotating shaft 1 with a constant inclination angle θ, and the stirring portion has a rectangular cross section. Since the rotary shaft 1 is made of a hollow shaft, it can be stirred while injecting the water-stopping liquid or the like into the excavation hole through the hole 8 at the tip thereof. At least one stirring blade 7 having a small height is provided on a flat stirring surface having a constant inclination angle θ above each stirring blade 6. The stirring blade 7 is formed of a rod-shaped body having a rectangular cross section, and one side of the rectangle of the rod-shaped body is joined to the stirring surface of the stirring blade 6 by welding or the like. The mounting positions of the stirring blades 7 with respect to the stirring blades 6 are slightly shifted in the longitudinal direction of the stirring blades, and the mounting positions of the stirring blades 7 are determined so that the earth and sand in the excavation hole can be uniformly stirred. As shown in FIG. 3, the stirring blade 7 has its longitudinal axis at an acute angle α with respect to the longitudinal axis of the stirring blade 6.
Are arranged on the inclined surface of the stirring blade so as to intersect with each other and fixed to the stirring blade 6 by welding or the like. 3 to 5 exemplify several ways of disposing the stirring blade 7 with respect to the stirring blade 6. In both cases, the stirring blade is arranged only on the upper surface of the stirring blade,
It is also possible to dispose stirring blades on the lower surface (or upper and lower surfaces) of the stirring blades. Next, how to use the auger of the embodiment of the present invention will be described. When this auger is used, the upper end of the rotary shaft 1 is fixed to the lower end of the rotary shaft of the excavator, and the rotary shaft of the excavator is rotated while vertically supporting the rotary shaft 1 and attached to the lower part of the rotary shaft 1. A soil excavation head including a head cutter 3 and an auger bit 5 excavates soil at a portion where a soil mountain retaining wall is to be formed. At the time of this excavation, the stirring blades 6 provided on the rotary shaft 1 serve to feed the excavated soil upward. During or after excavation, a water-stopping liquid (that is, cement milk, soil milk, etc.) is injected into the excavation hole from the hole 8 at the tip of the rotary shaft 1, and the stirring blade 6 attached to the rotary shaft 1 rotates. The mixture of earth and sand and the water stop solution is stirred. Stirring by the stirring blade 6 itself at the time of stirring is such that the stirring surface of the stirring blade having a constant inclination angle θ is a direction (vertical direction) at which the sand or sand (object to be stirred) is perpendicular to the longitudinal direction of the stirring blade. The stirring is performed by changing the direction. The sand and the like cannot be sufficiently mixed only by stirring with the stirring blade. However, since the stirring blade 6 of the auger of the present invention is provided with the stirring blade 7, the stirring blade 6 can be
The stirring performance of can be improved. The reason why the stirring performance is improved will be described according to how the stirring blades are arranged. When the stirring blade 7 is arranged only on the upper surface of the stirring surface having a constant inclination angle θ of one blade member 61 of the stirring blade 6 (third embodiment).
(Fig.) When the rotating shaft 1 is rotated in the direction of arrow r, the earth and sand that hits the stirring blade 7 from the direction of the arrow a by the stirring blade 7 moves in the direction of the arrow b (inward, that is, lateral direction). While changing the direction, the stirring surface of the blade member 61 of the stirring blade 6 also changes the direction upward (and downward) to improve the stirring state of the earth and sand in the excavation hole. The stirring condition of the portion around the rotating shaft 1 where the radius of rotation of the stirring blade 6 is small is also improved. The stirring performance of the stirring blade 6 is improved. One of the reasons for improving the stirring performance is to change the direction of soil and sand by the stirring surface of the stirring blade 7 and the stirring surface of the stirring blade 6 in the above two directions, and to plow the soil with the plow to make the plow. It is thought that this is due to the inversion of soil and sand, just as the soil inversion. Constant inclination angle θ of both blade members 61, 62 of the stirring blade 6
When the stirring blades 71 and 72 are disposed one by one on the upper surface of the stirring surface having the
When the rotating shaft 1 is rotated in the direction of arrow r, the stirring blade 71
Has the same action as the stirring blade 7 described above (FIG. 3), but the stirring blade 72 has a different action. That is, arrow c
The earth and sand hitting the stirring blade 72 from the direction of (3) changes its direction in the direction of arrow d (outward), and also changes its direction upward (and downward) by the stirring surface of the blade member 62 of the stirring blade 6, and excavates. Improves the stirring condition of soil and sand in the holes. During one rotation of the stirring blade 6, not only the direction is changed in the vertical direction, but also the earth and sand are changed in the direction of the arrow b (inward) and the direction of the arrow d (outward). Therefore, the stirring condition in the drill hole is very good. The stirring performance of the stirring blade 6 is improved. Two stirring blades 71, 72 are arranged substantially parallel to the upper surface of the stirring surface of one blade member 61 of the stirring blade 6 having a constant inclination angle θ, and two stirring blades 7 are arranged on the upper surface of the other blade member 62.
When 3 and 74 are arranged substantially parallel to each other and the two stirring blades 71 and 72 of one blade member 61 are arranged in opposite directions (Fig. 5), the number of stirring blades is doubled. Performance is improved. Its action is the same as that of. This arrangement of stirring blades is effective when a long blade member is adopted.

[Effect of device]

The auger used for forming the soil pile retaining wall of the present invention comprises a rotary shaft, a drilling head provided at the lower end of the rotary shaft, and a plurality of rotary shafts fixed to the rotary shaft above the drilling head at intervals in the axial direction. In an auger equipped with a stirring blade, a stirring blade composed of a plate-shaped body is fixed to a rotary shaft with an inclination angle, and at least one stirring blade composed of a rod-shaped body or a plate-shaped body is provided on a flat stirring surface of each stirring blade. The stirring blades are connected to the stirring blades so that the longitudinal axis of the stirring blades and the longitudinal axis of the stirring blades intersect at an acute angle. The stirring surface changes the direction of earth and sand, water-stopping liquid, etc. to the direction perpendicular to the axis of the stirring blade (vertical direction)
Stirrer blades connected to each stirrer blade are in a direction other than the direction perpendicular to the axis of the stirrer (diagonal lateral direction).
These direction changes are combined to change the direction to
The agitation state of earth and sand in the drill hole, the water-stopping liquid, etc. is greatly improved, the agitation performance of each agitation blade attached to the rotating shaft can be improved, and the number of agitation blades can be reduced.
It is possible to reduce the length of the portion of the rotating shaft on which the stirring blade is mounted. Since the number of agitating blades can be reduced and the length of the rotary shaft to which the agitating blades are attached can be shortened, when the rotary shaft is pulled up, the excavated soil adhered to the agitating blades falls and is caught by workers. It is less likely to cause a nuisance to third parties by being scattered on the road or in a neighboring house, and cleaning of the rotating shaft becomes easier. Further, according to the auger of the present invention, since it has a high stirring performance, it is possible to shorten the time required for stirring and prevent water leakage of the soil ridge retaining wall due to poor stirring. Further, in the auger of the present invention, a stirring blade made of a rod-shaped body or a plate-shaped body is provided on the flat stirring surface of the stirring blade made of a plate-shaped body with the longitudinal axis of the stirring blade and the longitudinal axis of the stirring blade. Since it is configured by connecting so as to form an acute angle and intersecting each other, the stirring blade and the stirring blade have a simple structure, so that the manufacturing thereof is facilitated, and the stirring blade and the stirring blade are also easily coupled, There is an effect that it is possible to provide an auger to be used for forming a soil pile retaining wall that is short and easy to use at low cost.

[Brief description of drawings]

1 to 5 are diagrams for explaining an embodiment of the present invention. FIG. 1 is a front view of a portion of an auger rod on which a stirring blade and the like are attached, and FIG. 2 is a stirring diagram of FIG. FIG. 3 to FIG. 5 are perspective views showing a part of the blade and the like, and FIG. 3 to FIG. 5 are schematic plan views illustrating three modes of arranging the stirring blade on the stirring blade. In the figure, 1 is a rotating shaft (auger rod), 3 is a head cutter, 4 is a supporting member, 5 is an auger bit, 6 is a stirring blade,
Reference numerals 61 and 62 are blade members, 7, 71 to 74 are stirring blades, 8 is a hole for ejecting a water-stopping liquid, etc., and θ is an inclination angle (rake angle).

Claims (1)

[Scope of utility model registration request] 1. An auger provided with a rotating shaft, an excavating head provided at a lower end of the rotating shaft, and a plurality of stirring blades fixed to the rotating shaft above the excavating head at intervals in the axial direction thereof. An agitating blade composed of a plate-like body is fixed to the rotating shaft with an inclination angle, and at least one agitating blade consisting of a rod-like body or a plate-like body is arranged on the flat agitating surface of each agitating blade. An auger used for forming a soil retaining wall, characterized in that the stirring blade is connected to the stirring blade such that the axis of the stirring blade and the longitudinal axis of the stirring blade intersect at an acute angle.