JP7112189B2 - Auger device and pile press-in machine - Google Patents

Description

The present invention relates to an auger device for excavating ground and a pile press-in machine equipped with the auger device.

When constructing piles in hard ground, excavation is performed using a pile press-in machine equipped with an auger or a three-point pile driver. Here, since the self-weight of the three-point pile driver is a reaction force, excavation with a large torque may tip over, which is dangerous. In particular, the construction of long piles is very dangerous, and since only low-torque excavation is possible, it takes time and costs.
On the other hand, a pile press-in machine equipped with an auger has the advantage that there is no fear of overturning because it works by gripping the pile that is pressed into the ground.

The auger device has an auger screw for excavating the ground and a cylindrical casing surrounding the auger screw. In a pile press-in machine equipped with such an auger device, the casing and auger screw are lowered while gripping the existing pile with a clamp, and the press-in pile is simultaneously driven while excavating the ground with an auger head (cutter) at the lower end of the auger screw. Alternatively, drill holes for press-fitting the next press-in piles are drilled in advance and the piles are driven.

However, in places where the height is restricted, such as when there is a structure such as a bridge above, the application of the auger device having a long overall length may be restricted. In addition, a large crane device is required in order to suspend the auger device having a long overall length, and construction may be difficult in narrow land.

For this reason, the present applicant proposed an auger device in Patent Document 1, in which the casing is configured by a plurality of split casings which can be connected in the axial direction, and which can be extended by connecting these split casings. According to the auger device of Patent Document 1, by appropriately connecting and extending a plurality of divided casings, it is possible to easily drive piles even in places where the construction height is limited or in narrow places. .

Japanese Patent Application Laid-Open No. 2002-242182

By the way, since the reaction force of ground excavation is applied to the casing of the auger device, it is necessary to reliably receive the reaction force applied to the casing in order to improve the excavation accuracy. Also, if the auger head hits an underground obstacle such as stone, gravel, or piece of concrete during excavation of hard ground, etc., the driving part and casing will be distorted (twisted) until the underground obstacle cracks. accumulates in the elastic range, and the so-called kickback phenomenon occurs in which the auger head advances at once due to the recoil at the moment the underground obstacle breaks. The result is a large fluctuating load on the casing of the auger system. Therefore, when the casing is composed of a plurality of split casings, it is required to effectively prevent positional deviation between the split casings.

On the other hand, in the case of sheet piles such as U-shaped steel sheet piles, since the casing of the auger device is attached to the inside of the sheet pile, the casing cannot be made very large, and the thickness is limited by the auger screw arranged in the casing. also receive Therefore, it is difficult to increase the strength by increasing the diameter and thickness, and it is difficult to effectively prevent the split casings from being displaced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to effectively prevent the positional deviation of the divided casings in an auger device in which the casing is composed of a plurality of divided casings.

In order to solve the above problems, according to the present invention, there is provided an auger device used for press-fitting sheet piles, comprising an auger screw for excavating the ground, a cylindrical casing surrounding the auger screw, and the auger screw. a locating pin and a recess for receiving the locating pin, wherein the casing is configured by connecting a plurality of split casings to prevent misalignment of the plurality of split casings to be connected; Displacement prevention mechanisms are provided on the side where sheet piles are arranged on the outside of the casing and the opposite side with respect to the central axis of the auger screw, and the end faces of the plurality of divided casings are aligned with each other on the auger screw. An auger device is provided which is bolted both on the side of the casing on which the sheet piles are located on the outside of the casing and on the opposite side with respect to the central axis .

In the auger device of the present invention, since the deviation prevention mechanism is provided on both the side where the sheet pile is arranged outside the casing and the opposite side with respect to the central axis of the auger screw, the sheet pile is arranged It is possible to prevent misalignment of the split casings on both the side to be sealed and the side opposite to it. Therefore, it is possible to effectively prevent positional deviation between the divided casings.

In the auger device of the present invention, on the side where the sheet piles are arranged outside the casing, the plurality of divided casings to be connected are each provided with a guide part for guiding the sheet piles, and the sheet piles are arranged on the side. A misalignment prevention mechanism on the arranged side may be arranged on the guide portion. In addition, on the side opposite to the side on which the sheet piles are arranged outside the casing, the plurality of connected divided casings are provided with rail portions for sandwiching the casing, preventing the opposite side from slipping. A mechanism may be arranged at a position different from the rail portion.

Further, according to the present invention, there is provided a pile press-in machine for press-fitting a pile into the ground, which includes the above auger device.

According to the present invention, by effectively preventing positional deviation of the divided casings, it is possible to firmly receive the reaction force applied to the casing of the auger device during ground excavation, thereby improving excavation efficiency and excavation accuracy. , energy saving can be achieved. Furthermore, by suppressing the positional deviation of the divided casings, it is possible to reduce the load and damage to the device due to the so-called kickback phenomenon, and to extend the life of the device. In addition, the improved excavation efficiency reduces wear on the bit tip of the auger head and extends the life of the auger head. In addition, loosening of connection bolts is suppressed, bolt breakage is also suppressed, and bolt dropout and casing breakage are eliminated, ensuring safety.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows schematic structure of the pile press-in machine provided with the auger apparatus which concerns on embodiment of this invention. It is a top view of a casing chuck part. It is a top view of a chuck part. FIG. 4 is a perspective view of a connecting portion of split casings that are connected vertically. FIG. 4 is a side view of the connecting portion of the divided casings connected vertically, viewed from the side opposite to the side on which sheet piles are arranged. FIG. 4 is a side view of a connecting portion of divided casings connected vertically, viewed from a position where both the side on which sheet piles are arranged and the opposite side thereof can be seen. It is explanatory drawing of the lower end surface of an upper split casing, and the upper end surface of a lower split casing. It is the side view which looked at the state which connected the upper and lower division|segmentation casings from the side opposite to the side where a sheet pile is arrange|positioned. FIG. 4 is a partial cross-sectional view showing the relationship between bolts and bolt holes; FIG. 5 is a partial cross-sectional view showing an engagement state between a projection provided on the upper end surface of the lower split casing and a recess provided on the lower end surface of the upper split casing. The positioning pin provided on the upper end face of the lower split casing is a partial cross-sectional view showing the state of engagement with the recess provided on the lower end face of the upper split casing. (b) shows the state after engagement. For explaining the embodiment of the present invention, one positioning pin and one recess are arranged on the side where sheet piles are arranged outside the casing, and the remaining one positioning pin and recess are arranged on the opposite side. , and a plan view of the chuck device. For explaining the embodiment of the present invention, two positioning pins and two recesses are arranged on the side where sheet piles are arranged on the outside of the casing, and the remaining two positioning pins and recesses are arranged on the opposite side. , and a plan view of the chuck device.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present specification and drawings, elements having substantially the same functional configuration are denoted by the same reference numerals, thereby omitting redundant description.

As shown in FIG. 1, the auger device 1 according to the embodiment of the present invention is attached to a pile press-in machine 20 for press-fitting the sheet pile A into the ground G. As shown in FIG. In this specification, the front is the direction in which the pile press-in machine 20 advances the press-in construction, the right side of the paper surface in FIG. 1 is the front side, and the left side of the paper surface is the rear side. The left-right direction is determined when the direction of press-fitting work is viewed from above. In FIG. 1, the upper side of the paper is the right side, and the lower side of the paper is the left side.

The auger device 1 includes an auger screw 2 that excavates the ground G, a casing 3 that surrounds the side of the auger screw 2 , and an auger drive section 4 that rotates the auger screw 2 . The auger device 1 is held by the chuck device 27 of the pile press-fitting machine main body 21 in a state in which the longitudinal direction of the casing 3 faces the vertical direction. The chuck device 27 has a casing chuck portion 27a on the upper side and a chuck portion 35 on the lower side. As will be described later, the casing chuck portion 27a can hold the casing 3 of the auger device 1 therebetween. The chuck part 35 can also hold the casing 3 of the auger device 1 , but can also hold the sheet pile A arranged outside the casing 3 together with the casing 3 .

The casing 3 has a cylindrical shape, and the auger screw 2 rotates inside the casing 3 . The casing 3 of the auger device 1 is configured by connecting a plurality of split casings. In the auger device 1 according to this embodiment, three split casings 3a, 3b, and 3c are connected in series from top to bottom. The lower end of the divided casing 3a and the upper end of the divided casing 3b are connected at the connecting portion 3j1, and the lower end of the divided casing 3b and the upper end of the divided casing 3c are connected at the connecting portion 3j2. The connecting portion 3j1 of the divided casings 3a and 3b will be described later in detail as an example.

A replaceable auger head 5 is attached to the lower end of the auger screw 2 protruding downward from the lower end of the casing 3. The auger head 5 is provided with a drilling bit (not shown) for crushing rocks such as cobbles. It is Further, the casing 3 is formed with discharge holes 6 for discharging excavated earth and sand, stones, etc. A plurality of the discharge holes 6 are provided along the longitudinal direction of the casing 3 at intervals.

The auger drive unit 4 is attached to the upper end of the casing 3, and the housing 4a of the auger drive unit 4 contains a hydraulic motor 7 serving as a drive source for the auger screw 2, and a reduction gear arranged below the hydraulic motor 7. A machine 8 is provided. A hydraulic hose 9 for an auger motor is connected to the hydraulic motor 7 .

A pile press-in machine main body 21 of the pile press-in machine 20 includes a saddle 24 equipped with a plurality of clamps 23 for gripping the existing sheet pile A', and a leader mast 26 configured to be movable back and forth with respect to the saddle 24 by a slide mechanism 25. , and a chuck device 27 configured to be able to move up and down with respect to the leader mast 26 . A general hydraulic hose 28 is connected to the leader mast 26 for hydraulically operating each part. Further, the leader mast 26 is provided with a hose reel 29 for winding and dispensing the hydraulic hose 9 for the auger motor, and the hose reel 29 is attached with a hose guide roller 30 with which the hydraulic hose 9 for the auger motor contacts. . The hose reel 29 rotates as the auger device 1 ascends and descends during excavation work, and applies tension to the hydraulic hose 9 for the auger motor during excavation work.

Next, the connecting structure of the divided casings 3a, 3b, 3c will be described. As an example, the structure of the connecting portion 3j1 between the divided casings 3a and 3b will be described. First, as shown in FIG. 2, the casing 3 of the auger device 1 can be clamped by a casing chuck portion 27a provided in the chuck device 27 of the pile press-fitting machine 20. As shown in FIG. Moreover, as shown in FIG. 3, the casing 3 and the sheet pile A can be integrally held by a chuck portion 35 provided in the chuck device 27 .

As shown in FIGS. 2 and 3, a side surface of the casing 3 is provided with a guide portion 40 and a rail portion 41 at positions opposite to each other with respect to the central axis O of the auger screw 2 disposed inside the casing 3. It is In addition, in FIGS. 2 and 3, the right direction is the front (the direction in which the press-in construction is progressed by the pile press-in machine 20), and in FIGS. It shows the orientation. However, the chuck device 27 of the pile press-fitting machine 20 can freely rotate the casing chuck portion 27a and the chuck portion 35, and the directions of the guide portion 40 and the rail portion 41 can be arbitrarily changed.

Here, in this specification, two regions S1 and S2 are defined around the casing 3 divided by a straight line L passing through the central axis O of the auger screw 2 shown in FIGS. 2 and 3, the area S1 shown above the straight line L is the side on which the sheet pile A is arranged outside the casing 3. As shown in FIG. The guide portion 40 is provided in this area S1 on the side surface of the casing 3 . A chuck portion 35 for holding the sheet pile A outside the casing 3 is also arranged in this region S1. On the other hand, in FIGS. 2 and 3, the region S2 shown below the straight line L is the side opposite to the side where the sheet pile pile A is arranged outside the casing 3 . A pair of rail portions 41 are provided in the region S2 on the side surface of the casing 3 . A casing chuck portion 27a provided in the chuck device 27 is also arranged in this region S2. The casing chuck portion 27a and the chuck portion 35 are positioned with respect to each other with the central axis O of the auger screw 2 interposed therebetween, but the chuck portion 35 is located below the casing chuck portion 27a.

The sheet pile pile A is arranged outside the guide portion 40, and the inner surface of the web of the sheet pile A is brought into contact with the outer surface of the guide portion 40, whereby the sheet pile A is positioned outside the casing 3 in the region S1. Then, as shown in FIG. 3, a movable claw 36 composed of a cylinder provided in the chuck portion 35 is arranged on the outer surface of the web of the sheet pile A positioned by the guide portion 40 in this way. Further, fixed claws 36 ′ facing the movable claws 36 of the chuck portion 35 are arranged outside the rail portion 41 in the region S<b>2 . By moving the movable claw 36 closer to the guide portion 40 by the power of the cylinder, the sheet pile A positioned by the guide portion 40 is held outside the casing 3, and the chuck portion 35 moves the sheet pile A. and the casing 3 are integrally held. Further, by holding the sheet pile A and the casing 3 integrally in this way, it is possible to prevent dirt and the like from entering between them.

On the other hand, as shown in FIG. 2, the casing chuck portion 27a is provided with a pair of guide grooves 42 extending in the vertical direction. By passing the casing 41, the casing 3 is held so as to be able to move up and down with respect to the casing chuck portion 27a. The casing chuck portion 27a is provided with a movable claw 37 and a fixed claw 38 which are composed of cylinders arranged at positions opposite to each other with the guide groove 42 interposed therebetween. It is arranged so as to be sandwiched between the claw 37 and the fixed claw 38 .

In this state, the movable claw 37 is moved toward the fixed claw 38 by the power of the cylinder so that the rail portion 41 is held between the movable claw 37 and the fixed claw 38. As a result, the casing The casing 3 of the auger device 1 is clamped by the chuck portion 27a.

The structures of the connection portion 3j1 and the connection portion 3j2 will be described with reference to FIGS. 4 to 7, taking the connection portion 3j1 between the divided casings 3a and 3b as a representative example. A ring-shaped convex portion 45 whose inner peripheral portion protrudes upward is provided on the upper end surface of the divided casing 3b (hereinafter referred to as the “lower divided casing 3b”) arranged below the divided casing 3a. A ring-shaped concave portion 46 for receiving the convex portion 45 is provided on the lower end surface of the divided casing 3a arranged above the casing 3b (hereinafter referred to as "upper divided casing 3b").

A positioning pin 47 projecting upward from the upper end face is provided on the upper end face of the lower split casing 3b, and a recess 48 for receiving the positioning pin 47 is provided on the lower end face of the upper split casing 3a. is provided. As can be seen from FIG. 7, in this embodiment, positioning pins 47 are provided at three locations on the upper end surface of the lower divided casing 3b, and similarly, the lower end surface of the upper divided casing 3a. , recesses 48 are provided at three locations. Of these three positioning pins 47, two positioning pins 47 are arranged in the guide portion 40 for positioning the sheet pile A. As shown in FIG. That is, these two positioning pins 47 are provided in the area S1 on the outside of the casing 3 on the side where the sheet pile A is arranged. On the other hand, the remaining one positioning pin 47 is arranged on the opposite side of the two positioning pins 47 arranged in the guide portion 40 with respect to the central axis O of the auger screw 2 . That is, the remaining one positioning pin 47 is provided in the region S2 where the rail portion 41 is located. Similarly, two recesses 48 of the three recesses 48 are arranged in the guide portion 40 . That is, these two recesses 48 are provided in the region S1, which is the side on which the sheet pile A is arranged on the outside of the casing 3 . On the other hand, the remaining one concave portion 48 is arranged on the opposite side of the two concave portions 48 arranged in the guide portion 40 with respect to the central axis O of the auger screw 2 . That is, the remaining one concave portion 48 is provided in the region S2 where the rail portion 41 is located.

2 and 3, FIG. 7 also shows a straight line L passing through the central axis O of the auger screw 2 and the sheet pile A arranged outside the casing 3 divided by this straight line L. It shows a region S1 on the side to which it is drawn and a region S2 on the opposite side. However, in FIG. 7, the area S1 is located on the left side of the straight line L, and the area S2 is located on the right side of the straight line L.

In the vicinity of the upper end of the lower divided casing 3b, a thick portion 50 is provided between the pair of rail portions 41 in the region S2 so that the side surface of the casing 3 protrudes outward. A single positioning pin 47 arranged at 1 is provided in this thick portion 50 . Similarly, in the vicinity of the lower end of the upper split casing 3a, a thick portion 51 is provided between the pair of rail portions 41 in the region S2 so that the side surface of the casing 3 protrudes outward. , and one recess 48 arranged in the region S2 is provided in this thick portion 51 .

A pair of nut insertion portions 52 are provided in the guide portion 40 near the upper end of the lower split casing 3b, and bolt holes 53 communicating with the nut insertion portions 52 are provided in the upper end surface of the lower split casing 3b. is open. In the vicinity of the upper end of the lower split casing 3b, a pair of rail portions 41 are also provided with nut insertion portions 54, and bolts communicating with the nut insertion portions 54 are provided on the upper end surface of the lower split casing 3b. A hole 55 is open.

A pair of bolt insertion portions 60 are provided in the guide portion 40 near the lower end of the upper split casing 3a, and bolt holes 61 communicating with the bolt insertion portions 60 are provided in the lower end surface of the upper split casing 3a. is open. Further, bolt insertion portions 62 are also provided in the pair of rail portions 41 near the lower end of the upper split casing 3a, and bolts communicating with the bolt insertion portions 62 are provided on the lower end surface of the upper split casing 3a. A hole 63 is open.

In order to facilitate understanding of the positional relationship, reference numerals of the projection 45 and recess 46, the positioning pin 47 and recess 48, the thick portions 50 and 51, and the bolt holes 53, 55, 61 and 63 are shown in FIGS. described inside.

When connecting the split casings 3a and 3b configured in this manner, the upper end face of the lower split casing 3b and the lower end face of the upper split casing 3a are brought into contact with each other so that the convex portion 45 becomes the concave portion. 46 and insert each locating pin 47 into each recess 48 . Next, as shown in FIG. 8, the bolt 65 is inserted into the bolt insertion portion 62 provided in the rail portion 41 of the upper divided casing 3a. Then, the threaded portion 65' of the bolt 65 is passed through the bolt hole 63 and the bolt hole 55, and the tip of the threaded portion 65' of the bolt 65 is inserted into the nut insertion portion 54 provided in the rail portion 41 of the lower divided casing 3b. protrude. A nut 66 is inserted into the nut insertion portion 54 provided in the rail portion 41 of the lower divided casing 3b. Then, a nut 66 is attached to the tip of the threaded portion 65' of the bolt 65 projecting from the nut inserting portion 54, and the bolt 65 and the nut 66 are fastened. Although not shown, the bolt 65 is also inserted into the bolt insertion portion 60 provided in the guide portion 40 of the upper divided casing 3a. Then, the threaded portion 65' of the bolt 65 is passed through the bolt holes 61 and 53, and the tip of the threaded portion 65' of the bolt 65 is inserted into the nut insertion portion 52 provided in the rail portion 41 of the lower divided casing 3b. protrude. A nut 66 is inserted into the nut insertion portion 52 provided in the guide portion 40 of the lower divided casing 3b. Then, a nut 66 is attached to the tip of the threaded portion 65' of the bolt 65 projecting from the nut inserting portion 52, and the bolt 65 and the nut 66 are fastened. By firmly fixing the lower end of the split casing 3a and the upper end of the split casing 3b with the four bolts 65 and nuts, the split casings 3a and 3b are integrally connected.

Here, as shown in FIG. 9, the inner diameter of the bolt holes 53, 55, 61, 63 is slightly larger than the outer diameter of the threaded portion 65' of the bolt 65 so that the bolt 65 can be rotated smoothly. It is set large, and a gap exists between the inner surface of the bolt holes 53 , 55 , 61 , 63 and the outer surface of the threaded portion 65 ′ of the bolt 65 . Therefore, it is difficult to effectively prevent horizontal positional displacement between the divided casings 3a and 3b (rotational displacement between the divided casings 3a and 3b and positional displacement in the front, rear, left, and right directions) depending on the bolt 65. . Further, as shown in FIG. 10, both a convex portion 45 provided on the upper end surface of the lower divided casing 3b and a concave portion 46 provided on the lower end surface of the upper divided casing 3a are ring-shaped. Even with the engagement of 45 and recess 46, it is difficult to effectively prevent rotational misalignment between split casings 3a and 3b.

When a downward load is applied to the auger head 5 during excavation, an upward reaction force is generated in the casing 3. The surface pressure between At that time, due to the rotational torque applied to the casing 3, the divided casings 3a and 3b tend to be displaced in the horizontal direction. If a lateral shift occurs due to repeated loads or the like, the bolts 65 are likely to loosen. Further, if some of the bolts 65 are loosened, the load on the bolts 65 that are not loosened increases, and there is a risk that the bolts 65 will be damaged. In addition, there is a possibility that shear force is applied to the bolt 65 and the bolt 65 is damaged due to the positional displacement of the divided casings 3a and 3b in the horizontal direction. Vibration and noise may occur due to the horizontal displacement of the split casings 3a and 3b at the connection portion 3j1.

On the other hand, as shown in FIGS. 11(a) and 11(b), the positioning pin 47 provided on the upper end face of the lower split casing 3b is simply inserted into the recess 48 provided on the lower end face of the upper split casing 3a. , and there is no need to rotate within the recess 48 . Therefore, the inner diameter of the recess 48 can be substantially equal to the outer diameter of the positioning pin 47, and the inner surface of the recess 48 and the outer surface of the positioning pin 47 can have substantially no gap. Therefore, by inserting the positioning pin 47 into the concave portion 48 and tightening with four bolts 65 and nuts 66, the divided casings 3a and 3b are integrally connected at the connection portion 3j1 in a state where they are not displaced in the horizontal direction. becomes possible.

In this case, the positioning pin 47 and the recess 48 are arranged in both the area S1 on the side where the sheet pile A is arranged outside the casing 3 and the area S2 on the opposite side thereof, and the sheet pile A is arranged. Positional displacement between the split casings 3a and 3b can be prevented by the engagement of the positioning pins 47 and the recesses 48 on both the side (region S1) and the opposite side (region S2). Thus, in both the two regions S1 and S2 divided by the straight line L passing through the central axis O of the auger screw 2, the engagement between the positioning pins 47 and the recesses 48 causes positional displacement between the divided casings 3a and 3b. , it is possible to effectively prevent horizontal positional displacement in the connecting portion 3j1. In addition, by inserting the convex portion 45 into the concave portion 46 and inserting the positioning pin 47 into the concave portion 48 and firmly connecting them with the bolt 65 and the nut 66, the split casings 3a and 3b are horizontally suspended after being connected. It is strong enough to withstand even Furthermore, by removing the bolt 65 and the nut 66, the split casings 3a and 3b can be easily split.

Then, in the pile press-in machine 20 according to the embodiment of the present invention, the existing pile A' is gripped by the clamp 23, and the ground G is excavated in a state where the reaction force for stabilizing the posture of the pile press-in machine main body 21 is taken. I do. When excavating the ground G, the auger screw 2 of the auger device 1 is rotated, and the casing 3 and the sheet pile A are lowered by a predetermined amount while being integrally held by the chuck portion 35 of the chuck device 27 . After that, the holding position of the chuck portion 35 is temporarily released, and the holding position is moved upward by a predetermined amount. Then, the casing 3 and the sheet pile A are integrally held by the chuck portion 35 again, and the casing 3 and the sheet pile A are lowered by a predetermined amount while rotating the auger screw 2 of the auger device 1 . By repeating this operation, excavation of the ground G and press-fitting of the sheet pile A are advanced. After the press-fitting of the sheet pile A is completed, the casing 3 is clamped by the chuck portion 35 or the casing chuck portion 27a at a position above the upper end of the sheet pile A that has been press-fitted, and lifted.

Here, during excavation, the reaction force of ground excavation is applied to the casing 3 of the auger device 1 . Further, during excavation of hard ground or the like, a large fluctuating load is applied to the casing 3 due to the kickback phenomenon. However, according to the auger device 1 according to this embodiment, as described above, the engagement between the positioning pins 47 and the recesses 48 arranged in both the two regions S1 and S2 causes the connection portion 3j1 to: Horizontal displacement of the split casings 3a and 3b is effectively prevented. Therefore, the reaction force applied to the casing 3 of the auger device 1 during ground excavation can be firmly received, the excavation accuracy is improved, the transmission efficiency of the ground excavation force is improved, and energy saving is achieved. Furthermore, by suppressing the positional deviation between the divided casings 3a and 3b, the burden on the device due to the so-called kickback phenomenon, the loosening and breakage of the bolt 65, and the deformation of the bolt holes 53, 55, 61, and 63 are also eliminated, and damage is caused. can be reduced, and the life of the device can be extended. Furthermore, the generation of vibration and noise during excavation can be suppressed. Although the structure of the connecting portion 3j1 between the divided casings 3a and 3b has been described as a representative, the connecting portion 3j2 between the divided casings 3b and 3c can also be configured similarly to the divided casings 3b and 3c. It is possible to suppress positional deviation between 3c.

Although one example of the embodiment of the present invention has been described above, the present invention is not limited to the embodiment shown above. It is obvious that a person skilled in the art can conceive various modifications or modifications within the scope of the technical idea described in the claims, and these are also within the technical scope of the present invention. be understood to belong to

For example, in FIGS. 3 to 8, three positioning pins 4 and recesses 48 for inserting them are provided, and two positioning pins 47 and An example is shown in which two recesses 48 are arranged and the remaining one positioning pin 47 and recess 48 are arranged in the region S2 on the opposite side. However, the numbers of positioning pins 4 and recesses 48 are arbitrary as long as they are two or more. Also, at least one positioning pin 47 and one concave portion 48 may be arranged in the area S1 on the side where the sheet pile A is arranged outside the casing 3 and in the area S2 on the opposite side.

For example, in FIG. 12, two positioning pins 4 and recesses 48 for inserting them are provided, and one positioning pin 47 and one A configuration in which the recess 48 is arranged and the remaining one positioning pin 47 and the recess 48 are arranged in the region S2 on the opposite side is shown. Further, in FIG. 13, four positioning pins 4 and recesses 48 for inserting them are provided, and two positioning pins 47 and two positioning pins 47 and two A configuration in which the recess 48 is arranged and the remaining two positioning pins 47 and the recess 48 are arranged in the area S2 on the opposite side is shown. All of these forms are included in the present invention.

Here, as shown in FIG. 11, if the height PH of the positioning pin 47 is set to be higher than the height KH of the ring-shaped projection 45 on the upper end surface of the lower divided casing 3b, As shown in FIG. 11A, the positioning pin 4 and the recess 48 can be aligned before the protrusion 45 and the recess 46 are engaged, which facilitates the work. In order to facilitate this alignment, it is desirable to form a tapered surface 47' on the upper end of the positioning pin 47. As shown in FIG. Further, the positioning pin 47 can be fixed to the upper end surface of the lower divided casing 3b by welding, interference fit, or the like.

Further, as an example of the displacement prevention mechanism for preventing positional displacement between the split casings 3a and 3b, the engagement structure between the positioning pin 4 and the recessed portion 48 has been shown, but as another form of the displacement prevention mechanism, for example, a key and a key groove can be used. It is also possible to apply a structure that prevents misalignment by engaging the . It should be noted that it is also possible to use a combination of the engagement structure between the pin and the recess and the structure for preventing misalignment by the engagement between the key and the keyway.

Further, in the above embodiment, the auger device 1 is attached to the pile press-in machine 20, but the auger device 1 may be attached to a three-point pile driver for penetrating the pile into the ground, for example. In this case as well, two regions S1 and S2 divided by a straight line L passing through the central axis O of the auger screw 2 are provided with anti-displacement mechanisms using positioning pins and keys, and split casings 3a and 3b are provided. It is possible to effectively prevent the horizontal positional displacement by preventing the positional displacement between them.

Moreover, the case where the casing 3 of the auger device 1 and the sheet pile pile A are integrally held by the chuck portion 35 of the chuck device 27 and press-fitting is performed has been described. However, when pre-excavating the ground G, for example, it is also possible to hold only the casing 3 of the auger device 1 by the chuck portion 35 of the chuck device 27 and rotate the auger screw 2 of the auger device 1 to excavate.

INDUSTRIAL APPLICATION This invention is useful as an auger apparatus which excavates the ground.

A Sheet pile A' Existing sheet pile G Ground L Straight line passing through the central axis of the auger screw O Central axis of the auger screw S1, S2 Area 1 Auger device 2 Auger screw 3 Casing 3a, 3b, 3c Split casing 3j1, 3j2 Connection part 4 Auger Drive 5 Auger Head 6 Discharge Hole 4a Housing 7 Hydraulic Motor 8 Reducer 9 Hydraulic Hose for Auger Motor 20 Pile Press-In Machine 21 Pile Press-In Machine Body 23 Clamp 24 Saddle 25 Slide Mechanism 26 Leader Mast 27 Chuck Device 27a Casing Chuck Part 28 whole hydraulic hose 29 hose reel 35 chuck part 36 movable claw 36' fixed claw 37 movable claw 38 fixed claw 40 guide part 41 rail part 42 guide groove 45 convex part 46 concave part 47 positioning pin 48 concave part 50, 51 thick part 52, 54 nut insertion part 53, 55 bolt hole 60, 62 bolt insertion part 61, 63 bolt hole

Claims (4)

An auger device used for press-fitting sheet piles,
an auger screw for excavating the ground;
a cylindrical casing surrounding the auger screw;
An auger drive unit for rotating the auger screw,
The casing is configured by connecting a plurality of divided casings,
A misalignment prevention mechanism consisting of a positioning pin and a recess for receiving the positioning pin, which prevents misalignment of the plurality of divided casings to be connected, is provided with sheet piles arranged on the outside of the casing with respect to the central axis of the auger screw. and on the opposite side ,
The auger device , wherein the end faces of the plurality of split casings are connected with bolts on both the side where the sheet piles are arranged on the outside of the casing and the opposite side with respect to the central axis of the auger screw . On the side where the sheet piles are arranged outside the casing, the plurality of connected divided casings are provided with guide portions for guiding the sheet piles, respectively, to prevent deviation of the side where the sheet piles are arranged. 2. The auger apparatus of claim 1, wherein a mechanism is located on said guide portion. On the side opposite to the side where the sheet piles are arranged outside the casing, the plurality of connected divided casings are provided with rail portions for sandwiching the casing, and the anti-slip mechanism on the opposite side is provided. The auger device according to claim 1 or 2, which is arranged at a position separate from the rail portion. A pile press-in machine for press-fitting a pile into the ground, comprising the auger device according to any one of claims 1 to 3 .

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