JP3215990B2 - Lower agitator for auger screw shaft in multi-shaft auger machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lower agitating device for an auger screw shaft in a multi-axis auger machine used for construction such as a column-type underground continuous wall method.

[0002]

2. Description of the Related Art For example, drilling a local board with a special multi-axis mixing and stirring auger, that is, drilling with a multi-axis auger machine, mixing and stirring in-situ soil and cement-based hardener to obtain a homogeneous soil. A method of constructing a so-called column-type underground continuous wall, which is also called an in-situ soil mixing method in which a cement pile is formed and a reinforcing material such as an H-beam is inserted into the pile to form a continuous wall in the ground, is known. It is.

[0003] The feature of this construction method is that, compared to the construction method of a column wall formed by a cast-in-place pile using a cast-in-place pile and a continuous wall constructed by a steel sheet pile method, noise and vibration during construction are reduced.
It is evaluated as a pollution-free construction method. Particularly in recent years, in connection with redevelopment of urban areas, it has been widely used for construction of mountain retaining walls and root cutting walls with underground excavation in areas where buildings and houses are built. And the depth is 60
It has been applied to the construction of continuous walls of more than meters.

[0004] By the way, this construction method has become popular in the construction of a continuous wall having a large depth in an urban area due to the development of a multi-axis auger machine having high workability and safety. By the way, the inventors of the present application have previously described a low gravity center type multi-axis auger machine with a deep excavation depth and in consideration of safety during construction (Japanese Patent Application Nos. 4-20238 and 4-202439).
No.) was developed.

As shown in FIG. 4, this low center of gravity type multi-axis auger machine uses a crawler type self-propelled vehicle as a base machine 5.
0 was set. A column-shaped leader 54 is vertically supported by a leader bracket 52 and a leader stay 53 on the front end of the swivel table 51 of the base machine 50, on the left side in the drawing. Next, the reader 54 is equipped with an auger propulsion device 55 so as to be able to move up and down freely.
(56, 56) is connected, and the lower end of each auger screw shaft 56 (56, 56) is held by a lower vibration-preventing device 57 provided in front of the leader bracket 52, that is, at the lower end of the leader 54. In this state, each auger screw shaft 56 (56, 56) is rotationally driven while the auger propulsion device 55 is lowered along the leader 54, and a trench for forming a desired continuous wall is formed. .

[0006] In particular, the developed multi-axis auger machine uses the three auger screw shafts 56 (56, 56) as a means for drilling a deeper continuous wall.
Are each telescope type, and a single type or telescope type rod 58 (58, 58) can be added to each auger screw shaft 56 (56, 56). 58 (58, 58) is characterized in that a rod storage device 59 is provided on the fuselage side so that a refill can be performed efficiently and safely.

This point will be described more specifically.
As shown in the figure, the three rods 5
8 (58, 58) is provided. That is, arms rotatable around the reader 54 as a rotation axis are protruded at positions above and below the intermediate portion of the reader 54. And
The holders 59a and 59b of the rod 58 (58, 58) are attached to the upper and lower arms, and the rod 58 (58, 5) is held by the upper and lower two-stage holders 59a and 59b.
8) was configured to be held vertically.

On the other hand, as shown in FIG. 4, the auger screw shaft 56 (56, 56) or the rod 58 (58, 58)
A so-called automatic connection device 60 capable of automatically connecting the upper end portions 58b of the respective devices is provided. That is, the auger screw shaft 56 (56, 56) connected to the automatic connecting device 60 is stretched, and furthermore, a rod 58 (58, 58) is added thereto to form a deep hole. It is characterized by the following.

The outline of the procedure for drilling by adding a rod 58 (58, 58) housed in the storage device 59 between the auger thruster 55 and the auger screw shaft 56 (56, 56) will be described. It is as follows. (1) First, the auger screw shaft 56 (56, 5
The auger propulsion device 55 is disconnected when the drilling according to 6) is completed, that is, when the drilling of one stroke of the auger screw shaft 56 (56, 56) is completed. Specifically, the connection of the auger screw shaft 56 (56, 56) to the auger propulsion device 55 is disconnected by operating the automatic connection device 60 provided on the lower surface of the auger propulsion device 55. (2) When the separating operation is completed, the auger propulsion device 55 is lifted up along the leader 54. (3) With the auger propulsion device 55 lifted, the storage device 59 mounted on the side surface of the reader 54 is turned to the front side of the reader 54 (see FIG. 5). That is, the storage device 5
9 is made to stand by immediately below the auger propulsion device 55 suspended along the reader 54. (4) Then, the auger thruster 55 is lowered. Then, the upper end 58b of each rod 58 (58, 58) stored in the storage device 59 is automatically connected via the automatic connection device 60 provided on the lower surface of the auger propulsion device 55. (5) When the connection operation is completed, the auger thruster 55
Is lifted upward. Then the rod 58 (58, 58)
Is separated from the storage device 59. Therefore, the storage device 59 itself is returned to the original position as shown by the solid line in FIGS. 4 and 5 in the separated state. That is, the storage device 59 is retracted from immediately below the auger propulsion device 55. (6) When the storage device 59 is retracted, the auger propulsion device 55 is lowered again. Therefore, each rod 58 (58, 58)
Is connected to the upper end of the auger screw shaft 56 (56, 56) which has been drilled. With the above procedure, the work of adding rods 58 (58, 58) is completed. If the auger propulsion device 55 is lowered again at the time of completion, the drilling operation can be continued.

The low center of gravity type multi-axis auger machine developed by the inventors of the present invention has a configuration as schematically described above, so that the height of the machine is suppressed, that is, the machine has a low center of gravity, and the machine has a fall, etc. The risk of accidents is reduced,
In addition, deeper drilling was made, and it became possible to construct deeper continuous walls in urban areas.

[0011]

The low-center-of-gravity type multi-axis auger machine developed above and the conventional multi-axis auger machine are common to each other. However, in order to prevent the auger screw shaft from swinging during drilling work. As shown in FIG. 4, the lower anti-shake device 57 is equipped to hold the auger screw shaft 56 (56, 56) at a position in front of the lower end of the leader 54 and to exert an anti-shake function.

However, as shown in FIG. 6, when the corner is constructed, that is, when the leader 54 is rotated and the auger screw shaft 56 (56, 56) connected to the auger thruster 55 is moved to bore the hole. , It is necessary that the lower sway device 57 also moves following the rotation of the reader 54.

However, in a conventional multi-axis auger machine,
Usually, the lower end of the reader 54 has a non-rotational structure due to the relationship with the base machine (see FIG. 4). Therefore, when the lower sway device 57 is integrally provided at the lower end of the reader 54, the lower sway device 57 does not move following the rotation of the reader 54.

For this reason, the conventional lower vibration-reducing device 57 has the structure shown in FIG.
As shown by, a guide rod 55a (55a) of an auger propulsion device 55 that is raised and lowered along the reader 54 is configured to be movable upward through a slide bracket 59. That is, when it is necessary to rotate the leader 54 to perform a hole drilling operation on a corner portion,
The lower sway device 57 is slid up from the non-rotating portion 54a at the lower end of the reader 54 to a position higher than the height of the rotating portion 54b of the reader 54 each time. 57 was equipped so that it could follow. In FIG. 4, a position indicated by a virtual line indicates a position where the lower sway device 57 is slid up.

The means for sliding up the lower sway device 57 is not specifically shown in the drawing, but the slide bracket 59 is provided with a reader 54.
The suspension wire is linked via a top sheave provided at the top of the, and the suspension wire is operated using a winch or the like, so that the suspension wire is slid up by a so-called lifting method.

As described above, in the conventional multi-axis auger machine, when the corner portion is to be constructed, the lower sway device of the auger screw shaft is lifted by a winch or the like to the height of the rotating portion of the leader each time. I had to slide up. As a result, the load on the operator during construction has been increased. In addition, since it is necessary to perform drilling work with the lower sway device slid up, there is a disadvantage that the effective length of the auger screw shaft and the added rod cannot be fully utilized by the amount of the slide up. . This point is a problem in corner construction in a multi-axis auger machine developed by the present inventors with a low center of gravity and capable of deeper depth drilling. That is, the operation of the machine by the operator becomes complicated, and further, the workability and the safety become difficult, and the utility as the low center-of-gravity multi-axis auger machine cannot be fully exhibited.

[0017]

SUMMARY OF THE INVENTION The present invention solves such a problem at the time of corner construction and has a low center of gravity.
An object of the present invention is to provide a multi-shaft auger machine that is highly safe and that can increase the drilling depth, and has a lower agitator for an auger screw shaft configured as follows.

First, a rotating device having the axis of rotation of the reader as the center of rotation was attached to the lower surface of the non-rotating portion, which is the lower end of the reader. Next, the lower arm and the upper arm were horizontally extended to the rotating device and the rotating part of the reader, respectively. A guide bracket is supported at the distal end of the lower arm and the upper arm, and an auger screw shaft is inserted into the guide bracket, and a lower swing body that is rotatably gripped is vertically movably mounted. That is, the configuration was made to be.

As means for movably mounting the lower sway main body on the guide bracket, a hydraulic operating cylinder is incorporated in the guide bracket, and the lower sway main body is vertically moved by operating the operating cylinder. It was configured to be movable.

[0020]

As described above, according to the present invention, the guide bracket is supported by the rotating device assembled to the lower end portion of the reader, and the lower arm and the upper arm extending horizontally from the rotating device and the rotating portion of the reader. Since this guide bracket is equipped with a lower oscillating body to provide a lower oscillating device for the auger screw shaft, when the corner is installed, when the reader is rotated, it follows the rotation of the upper arm that protrudes from the rotating part of the leader. The lower arm is also rotated about the reader as an axis. That is, the lower oscillating body constituting the lower oscillating device is also rotated. As a result, it is not necessary to carry out the lifting operation of the lower sway device every time when the corner portion is constructed, unlike the related art. Also, since the lower oscillating body is mounted vertically movable with respect to the guide bracket, if it is difficult to attach or remove the auger screw shaft from the lower oscillating body, use this function to lower the auger screw shaft. If the stop main body is operated to move up and down, the attaching and detaching operation is easy.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the specific structure of the lower sway device according to the present invention will be described with reference to the embodiments shown in the drawings. FIG.
The lower tremble body 1 constituting the lower tremor device is connected to the reader 54.
FIG. 7 is a side view showing a state in which the apparatus is provided between a lower end portion, which is a non-rotating portion 54a, and a rotating portion 54b. As described above, the lower end portion of the leader 54, that is, the lowermost portion, is supported by the swivel table 51 of the base machine 50 via the leader bracket 52, and thus has a non-rotational structure.
The second-stage reader 54b on the second stage is generally rotatable.

Therefore, in this embodiment, the rotating device 2 is attached to the non-rotating portion 54a of the reader 54 having a non-rotating structure, that is, the lower end portion. Specifically, as shown in FIG. 1, the disc-shaped rotator 2a that rotates about the axis of the reader 54 is
a. And this disk-shaped rotating body 2
The lower arm 3 and the upper arm 4 were respectively attached by the following means from the rotating device 2 composed of a and the rotating portion 54b of the rotatable reader 54.

First, as shown in FIG. 1, the lower arm 3 is provided with a horizontal mounting shaft 2c at the lower end of a rotating shaft 2b integral with the rotating body 2a of the rotating device 2, and a flange joint is provided on the horizontal mounting shaft 2c. The lower arm 3 was fastened by a method and protruded in the horizontal direction. FIG. 2 is an enlarged plan view taken along the line AA of FIG. 1 showing its components.

Next, as shown in the plan views of FIG. 1 and FIG.
4b, brackets 4a and 4a projecting left and right (up and down in the figure) as shown in FIG. 3 were attached. Arm members 4b and 4b each having a U-shape in plan view were integrally fastened to the distal ends of the brackets 4a and 4a by using a flange joint method as described above.

Further, the lower arm 3 and the upper arm 4
As shown in FIG. 1, the guide bracket 5 of the lower vibration-reducing main body 1 serving as a lower vibration-reducing device for the auger screw shaft 56 (56, 56) was mounted between the distal ends of the auger screw shafts 56 (56, 56). Although the details of the mounting means are not shown in the drawings, they were mounted by tightening using bolts and nuts as shown in FIGS.

The lower oscillating body 1 constituting the lower oscillating device in this embodiment is applied to a multi-axis auger machine having three auger screw shafts 56 (56, 56). As shown in FIG. 3, three auger screw shafts 56 (56, 56) were inserted vertically and formed into a cylindrical drum body so as to rotatably grip them.

Next, the means for mounting the lower oscillating body 1 on the guide bracket 5 so as to be vertically movable in the vertical direction is configured as shown in plan views of FIGS. First, a vertical slide groove 5a (5a) is provided on each of the left and right sides of the guide bracket 5. On the other hand, an engaging portion 1b (1b) that engages with the slide groove 5a (5a) is provided on the lower vibration-reducing main body 1 side. Then, the engaging portion 1b (1
b) is engaged with the slide groove 5a (5a),
It was slidable up and down. As shown in FIGS. 1 and 3, hydraulic operating cylinders 6 and 6 are assembled on both left and right sides of the guide bracket 5, and the rods 6a and 6a of the operating cylinders 6 and 6 are connected to the lower vibration-preventing main body 1 side. I let it. That is, the operation cylinder 6
When the actuators 6 and 6 were operated, the lower oscillating body 1 was equipped so that it could move vertically along the slide groove 5a (5a) of the guide bracket 5.

Since the lower sway device of the auger screw shaft according to the present invention is configured as described in the above embodiments, when the leader is rotated at the time of forming the corner portion, the lower sway device is also synchronized with the leader. Orbit around. As a result, unlike a multi-axis auger machine equipped with a conventional lower sway device, it is no longer necessary to lift the lower sway device every time a corner is constructed, thus improving workability, operability, and safety. The following effects were able to be exerted on such functions.

[0029]

【The invention's effect】

(1) There is no need to lift the lower sway device every time the leader is rotated during construction of the corner. Therefore, the workload of the operator is reduced. (2) Since there is no need to drill holes while the lower sway device is lifted, there is no loss in the effective length of the auger screw shaft that is lost by lifting the lower sway device. Therefore, by equipping the low-center-of-gravity type multi-axis auger machine developed earlier by the inventors of the present application with this lower vibration isolator, the safety as a construction machine for building a continuous wall in an urban area,
Workability and operability can be improved, and the effect as a more functional construction machine can be exhibited. (3) Since the lower sway device itself is mounted so that it can be moved up and down, it is necessary to add rods to the auger screw shaft and to remove and attach the auger screw shaft itself from the lower sway device. Is easy.

[Brief description of the drawings]

FIG. 1 is a side view showing an essential part of an auger screw shaft lowering device according to an embodiment of the present invention, which is attached to a leader.

FIG. 2 is an enlarged plan view taken along line AA in FIG.

FIG. 3 is a cross-sectional plan view taken along line BB in FIG.

FIG. 4 is a side view showing a schematic configuration of a low center of gravity type multi-axis auger machine previously developed by the present inventors.

FIG. 5 is a plan view showing a state where the storage device is turned 90 degrees to the front of the reader.

FIG. 6 is a plan view showing a posture of the multi-axis auger machine in the corner portion construction.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 50 ... Base machine 51 ... Revolving base 52 ... Leader bracket 54 ... Leader, 54a ... Non-rotating part, 54b ... Rotating part 56 ... Auger screw shaft 1 ... Lower shaking main body, 1b ... Engaging part 2 ... Rotating device, 2a ... Rotating body, 2b ... rotating shaft, 2c ... horizontal mounting shaft 3 ... lower arm 4 ... upper arm, 4a ... bracket, 4b ... arm member 5 ... guide bracket, 5a ... slide groove 6 ... hydraulic operating cylinder, 6a ... rod

──────────────────────────────────────────────────続 き Continuing from the front page (73) Patent holder 390036467 Seiko Kogyo Co., Ltd. 1-7-24 Otemae, Chuo-ku, Osaka-shi, Osaka (72) Inventor Yuichi Shirakawa 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Inside Taisei Corporation (72) Inventor Masayuki Okochi 1-25-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo Inside Taisei Corporation (72) Inventor Kinue Konno 1-25-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo No. Taisei Construction Co., Ltd. (72) Inventor Sokichi Yajima 1-15-1 Ginza, Chuo-ku, Tokyo Nariwa Kiko Co., Ltd. (72) Inventor Akio Seya 1-15-1 Ginza, Chuo-ku, Tokyo Nariwa Kiko Co., Ltd. (72) Inventor Hideo Iida 1-14-5 Ginza, Chuo-ku, Tokyo Nariwa Kiko Co., Ltd. (72) Inventor Mamoru Hamano 1293 Amantocho, Hanamigawa-ku, Chiba-shi, Chiba Miwa (72) Inventor Etsuo Hirakawa, Chiba Pref., Chiba Pref., Chiba Pref., Chiba Pref., Chiba Pref., Chiba Pref., Chiba Pref., Chiba Pref., Chiba Pref., Chiba Pref. Company Chiba Plant (72) Inventor Yasushi Shitomi 2 Iwamotocho, Chiyoda-ku, Tokyo Nariyuki Industry Co., Ltd. East Japan Production Headquarters (56) References JP-A-59-4793 (JP, A) JP-A-59-206519 (JP) , A) Japanese Utility Model Showa 62-163542 (JP, U) Japanese Utility Model Showa 63-36540 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02F 5/02 E02D 17/13

Claims (1)

(57) [Claims] A multi-axis auger machine includes a non-rotating portion at the lower end of a reader, and a rotating device having the axis of the reader as a center of rotation is attached to the rotating device and the rotating portion of the reader. A lower bracket for supporting an auger screw shaft in a multi-axis auger machine, wherein the lower bracket and the upper arm support a guide bracket, and the guide bracket is equipped with a lower stabilizer body.