JPH0242741Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> The present invention relates to an earth auger that is an improvement on the auger screw of a multi-shaft auger machine used for constructing continuous walls, etc.

<Prior art> Conventionally, the auger screw of a multi-shaft auger machine commonly used has, for example, a three-shaft type in which the rotating shafts at both outer positions rotate in the forward direction, and the rotating shaft at the center position rotates in the reverse direction. , a forward screw is arranged on the forward rotation shaft, and only a reverse screw is arranged on the reverse rotation shaft. That is, conventional rotating shafts (auger screws) of this type have only provided a forward screw or a reverse screw for each unit shaft, and their rotation ranges overlap each other. For this reason, even if a predetermined depth of excavation is achieved during excavation, for each unit axis, soil, sand,
There is less need to knead the cement solution while pressing it down. The so-called degree of disturbance (mixing and agitation) is small, the pressure on the circumferential wall of the borehole is small, and the formation of an expanding consolidation wall is small.
Therefore, the amount of soil discharged to the ground increases accordingly,
Not only is the disposal of this residual soil troublesome, but it also causes secondary pollution because the discharged soil itself contains cement solution. It also had deficiencies that led to uneconomical use of cement.

<Problems to be solved by the invention> In view of the above-mentioned circumstances, the present invention proposes an earth auger with an auger screw structure that can perform a kneading action that increases the degree of disturbance of the excavated earth and sand and the injected cement solution. The aim is to provide a solution and eliminate the aforementioned deficiencies.

<Means for Solving the Problems> The present invention is a multi-shaft auger machine, in which the auger screw configuration arranged on the forward rotation shaft is connected from the lower end to the forward screw and the double shaft portion concentric with the forward rotation shaft. The auger screw structure of the reverse rotation shaft facing the screw interval part of the forward rotation shaft is arranged so that the reverse rotation screws and the reverse rotation shaft are arranged one after another at a predetermined interval from the lower end. and forward screws provided on concentric double shaft portions are arranged alternately, and a transmission gear is interposed between the gear of the double shaft portion of the forward rotation shaft and the gear provided on the adjacent reverse rotation shaft. The gears on the double shaft portion of the reverse rotation shaft mesh with the gears provided on the adjacent forward rotation shaft through a transmission gear to achieve substantial forward rotation, and each shaft All the forward screws of the screw rotate in the forward direction, and all the reverse screws rotate in the reverse direction.

<Operation> Due to the above configuration, if this multi-shaft auger screw is lowered in the same way as before, excavation will start at the auger head placed at the lower end of each rotating shaft, and the soil will be lifted one by one. However, on this forward rotating shaft, forward screws and reverse screws that rotate in the opposite direction are located alternately, and on the reverse rotating shaft, reverse screws and forward screws that rotate in the forward direction are located alternately. Therefore, during each rotating shaft, the reverse screw or forward screw, which is opposite to the rotation, has a long remixing width, which increases the degree of disturbance of the earth, sand and cement solution, and increases the pressure on the circumferential wall of the borehole, resulting in a consolidation wall. The formation of soil can be maximized, and soil discharge to the ground can be substantially suppressed.

<Example> Hereinafter, the present invention will be explained based on the drawings of the example.

Figures 1 to 3 show the case where the multi-axis is three axes.
Reference numerals 1 and 1 are hollow shaft type normal rotation shafts located on both outer sides, and 2 is a hollow shaft type reverse rotation shaft located in the middle. A forward screw 3 with an appropriate pitch is attached directly to the forward rotation shaft 1 from the lower end, and a double shaft portion 5 with a bearing 4 interposed on the forward rotation shaft 1 is provided.
The reversing screws 6' arranged on the reversing shaft 2 are arranged alternately at predetermined intervals to form a single auger screw, and the reversing screws 6 are attached directly to the reversing shaft 2 from the lower end, and the reversing shaft A forward screw 3' disposed on a double shaft portion 5 with a bearing 4 in between.
and are arranged alternately at predetermined intervals to form a single auger screw, and the gear 7 is integrated in the center of the double shaft portion 5 of the reversing screw 6'.
The drive gear 8 fixed to the adjacent reverse rotation shaft 2 meshes with the transmission gear 9 to obtain reverse rotation, and the gear 7' integrated with the double shaft portion 5 of the forward screw 3' is engaged with the adjacent drive gear 8 for forward rotation. It is configured to mesh with a drive gear 8 disposed on the shaft 2 via a transmission gear 9 to obtain positive rotation. The gear 7, transmission gear 9, drive gear 8, transmission gear 9, gear 7 group, drive gear 8, transmission gear 9, gear 7', transmission gear 9, drive gear 8 group arranged on each line are as follows:
Each is housed in an independent sealed case 10. Of course, the case 10 has at least the width (maximum diameter of each gear) set to be smaller than the wingspan of the forward screw 3 on the forward rotating shaft 1 and the reverse screw 6 on the reverse rotating shaft 2, so that the soil lifting action of the screws can be improved. without causing any hindrance. However, the fixed position support of the case 10 is achieved by fixing the support metal 11 that fits onto the forward rotation shaft 1 or the reverse rotation shaft 2. Further, each transmission gear 9 is supported on a shaft protruding from the case 10 side. still,
The connection of the unit lengths of the counter-rotating shafts 1 and 2 is performed at the same level position, and the connection means is provided with male and female fitting means 12 formed at the shaft ends similar to the known screw connection. , so that they can be successively connected as necessary. If this connection means is arranged at the upper and lower positions of the case 10 where the transmission gears are arranged, maintenance and inspection of each gear in the case 10 will be facilitated, and replacement of the rotating shaft side due to wear of the screw etc. It is also convenient for

To explain this action now, first, these three shafts (two forward rotation shafts 1 and one reverse rotation shaft 2) are attached to the lower end of a known multi-shaft type auger drive device 13,
An auger head 14 with a solution spouting hole 14a is arranged at the tip (lower end) of each of the forward rotation shaft 1 and the reverse rotation shaft 2, forming three auger screws.

Here, when the forward rotation shaft 1 and the reverse rotation shaft 2, which serve as the auger screws, are given a predetermined rotation and pushed down into the ground, the ground is excavated by the claws of the auger head 14. At this time, a separate cement solution injection means (not shown) is used to inject the cement solution into the hollow portion 15 of each rotary shaft, and the cement solution is ejected from the solution ejection hole 14a of the auger head 14.

For each rotating shaft 1, 2, the forward screws 3, 3' that rotate in the forward direction and the reverse screws 6, 6' that rotate in the opposite direction are arranged alternately, so that the forward screws 3, 3' rotate in the opposite direction. , 3', the excavated soil and cement liquid are kneaded and kneaded over a long distance at the reverse screws 6, 6', and maximum mixing and agitation is achieved. In other words, since the degree of disturbance is good,
Pressure on the circumferential wall of the borehole also increases, a consolidation wall is reliably formed, and the amount of soil lifted is reduced accordingly.

Of course, even if the lifted soil becomes so-called dango-shaped during this excavation, it can be reliably cut down due to the combination of forward and reverse screws.

Since this step is carried out sequentially in the upward direction of each of the rotating shafts 1 and 2, the amount of soil discharged (including cement liquid) at the excavation mouth is minimal or non-existent.

In this case, the rotation of the reverse screw 6' disposed on the forward rotation shaft 1 is transmitted from the drive gear 8 directly attached to the adjacent reverse rotation shaft 2 through the transmission gear 9, which is a planetary gear, to the gear 7 of the double shaft portion 5. Since it rotates in the opposite direction, it is on the axis of the forward rotation shaft 1 and rotates in the opposite direction. Further, the rotation of the forward screw 3' on the reverse rotation shaft 2 is caused by the drive gear 8, transmission gear 9, and
It is transmitted to the gear 7' of the double shaft portion 5 and rotates in the normal direction.

This also applies to the five-axis case shown in FIG. At this time, both outer axes and the center axis are defined as a forward rotating shaft 1, and the shaft interposed between the forward rotating shafts 1 is defined as a reverse rotating shaft 2. Each of the forward and reverse rotation shafts 1 and 2 has a double shaft portion 5 with a reverse screw 6' on the forward rotation shaft 1, which rotates in the opposite direction, and a normal screw shaft portion 5, which rotates in the forward direction, on the reverse rotation shaft 2, as described above. Double shaft part 5 with advanced screw 3'
is interposed between a forward screw 3 or a reverse screw 6 which are directly attached to the rotating shafts 1 and 2, respectively. Of course, the rotational transmission of the reverse screw 6' and the forward screw 3' also employs substantially the same configuration as the three axes described above. Similar to the triaxial type, excavation in this case also mixes and stirs the excavated soil and cement liquid, and also includes a downward pressing action, so that a consolidation wall is formed on the circumferential wall of the borehole.

<Effect of the invention> As mentioned above, the earth auger of the present invention has a multi-axis (3-axis, 4-axis, 5-axis, etc.) rotating shaft that constitutes each auger screw, and the forward rotating shaft side is a forward screw. In addition to disposing a reverse screw that rotates in the opposite direction, a reverse screw that rotates in the forward direction and a reverse screw that rotates in the forward direction are alternately arranged on the reverse rotation shaft side, so that dumping of soil in the shape of a dumpling is prevented, and each of these screws is The reversing screw or reversing screw, which is located on the rotation axis and rotates in the opposite direction, forms a kneading zone with a high degree of disturbance, forming an efficient consolidation wall on the excavation peripheral wall and reducing the amount of soil discharged at the excavation mouth. Minimum or no amount. Therefore, it not only solves the conventional problem of disposal of residual soil, but also provides economical effects such as suppressing the use of cement more than necessary.

The rotating shafts are connected (pin-engaged) at intervals of a predetermined length as in the prior art, so that when the screw blades wear out, only the screw shaft portion can be replaced with a new one.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a front view, FIGS. 2A and B are explanatory diagrams showing gear transmission, FIG. 3 is a cutaway front view of the main part of the gear case, and FIG. FIG. 5 is an explanatory diagram of the double shaft portion, FIG. 5 is an explanatory diagram of the usage state, and FIG. 6 is an explanatory diagram of the usage state of another embodiment. 1... Forward rotating shaft, 2... Reverse rotating shaft, 3, 3'... Forward screw, 4... Bearing, 5... Double shaft part,
6, 6'... Reverse screw, 7, 7'... Gear, 8...
Drive gear, 9...Transmission gear, 10...Case.

Claims (1)

[Scope of utility model registration request] In a multi-shaft auger machine, the auger screws placed on the forward rotation shaft are alternately arranged with forward screws and reverse screws installed on a double shaft part concentric with the forward rotation shaft, and The auger screws arranged are alternately arranged with reverse screws and forward screws provided on a double shaft section coaxial with the reverse rotation shaft, and the double shaft section of the forward rotation shaft is attached to the adjacent double shaft section. The reverse rotation is caused by the transmission gear of the rotation from the reverse rotation shaft, and the double shaft portion of the reverse rotation shaft is made to rotate in the forward direction by the transmission gear of rotation from the adjacent forward rotation shaft, and the forward screw of each shaft is made to rotate in the forward direction. , Earth auger with reverse rotation screw.