JPS6224574B2 - - Google Patents

Description

[Detailed description of the invention] The present invention mainly aims to improve soft ground.
This invention relates to a sand trench construction device used to create sand trenches in soft ground.

This type of sand pile building device inserts an outer cylinder under pressure into the ground, and then feeds sand for pile building into the outer cylinder while the sand is inserted into the outer cylinder. The structure is such that the sand is tamped by moving the ramming rod up and down, and while performing such tamping work, the outer cylinder can be pulled out together with the ramming rod as sand pile construction progresses in the ground. has been done.

Conventionally, the outer cylinder was inserted into the ground by using its own weight applied to the outer cylinder or by the vibration effect of an exciter, and the vertical movement of the thrust rod was performed by a so-called crank mechanism. .

However, when inserting the outer cylinder into the ground, a vibrator causes noise pollution due to vibration, so it is preferable to allow the outer cylinder to sink under its own weight if possible, but it is difficult to insert it into soft ground or slightly hard soil. If the outer cylinder hits the ground, it may be blocked and unable to sink.In this case, the outer cylinder can be rotated to reduce the friction between it and the ground, thereby promoting the sinking due to its own weight. However, if a series of drive devices are provided to rotate this outer cylinder,
This becomes a hindrance, and a new difficulty arises in that the above-mentioned thrust rod drive device cannot be installed coaxially.

The present invention has focused on the above-mentioned drawbacks, and has made it possible to move the thrust rod up and down using a crank mechanism, and at the same time, to drive the outer cylinder in rotation, thereby making it possible to rotate the outer cylinder without causing noise pollution. This device can be inserted into the ground, and its gist is that a first rotary drive device 8 and a second rotary drive device 18 are installed on a mounting frame 2 that is supported and guided by a leader 1 and moves up and down. A rotary inner cylinder 1 is attached to the hollow output shaft 9a of the one-rotation drive device 8 and rotates integrally therewith.
1a, and a rotary outer cylinder 11b that rotates integrally with the inner cylinder 11a via a connecting member 13 is vertically installed downward so as to have a sand falling passage 12a between both the inner and outer cylinders 11a and 11b, and rotating outer cylinder 11
A protrusion 16 is provided in a spiral shape on the outer peripheral surface of b,
Further, a ramming rod is connected to the sand charging hopper 6 through a swivel joint mechanism 15 in the sand falling passage 12a, and is used to compact the sand fed into the rotary outer cylinder 11b through the sand falling passage 12a. 22 is provided so as to pass through the hollow output shaft 9a and the rotating inner cylinder 11a and to be movable up and down, and the upper end of the push rod 22 is connected to the second rotation drive device 18, and the rotation movement of the drive device is connected to the push rod 22. This configuration is connected via a crank mechanism 20 for converting the movement into vertical movement.

One embodiment of the present invention will be described below. In Figs. 1 and 2, 1 indicates a leader, which is mounted on a crawler truck (not shown) and moved to a sand pile construction site. held vertically.
2 is a mounting frame, and this mounting frame 2 is attached to the above reader 1.
The rectangular frame-shaped upper mount 3 and the lower mount 4 provided below it are supported by four supporting members 5 by a well-known guide (not shown).
It is connected and maintained. The supporting member 5 of the mounting frame 2 extends below the lower mounting base 4, and a hopper 6 for charging sand is fixed in a predetermined position to the extended portion.

A cylindrical body 7 is fixed to the outlet portion 6a of the hopper 6 with its axis in the vertical direction, and the inside of the hopper 6 is communicated with the inside of the cylindrical body 7. Note that the hopper 6 is normally fixed to the supporting member 5 in pairs on the left and right sides, but in the illustrated example, the sand inlet portion 6c of one of the hoppers is removed, leaving only the chute portion 6b. .

On the other hand, 8 indicates a first rotational drive device, which is
It is installed on the lower mounting base 4 of the mounting frame 2. The first rotary drive device 8 includes a reducer 9 having two input shafts and one hollow output shaft 9a, and two drive motors 10, 10.
Output shafts 0 and 10 are connected to each input shaft of the speed reducer 9, respectively. The speed reducer 9 is configured such that an output corresponding to the sum of the respective outputs of the two drive motors 10, 10 can be extracted from its output shaft.

Next, the hollow output shaft 9a of the reduction gear 9 includes:
The upper end of a rotating inner cylinder 11a arranged to concentrically penetrate the cylinder body is fixed, and a rotary inner cylinder 11a extends further downward than the rotating inner cylinder 11a to the lower half of the rotating inner cylinder 11a. The rotary outer cylinder 11b is fitted onto the outside concentrically, and both are integrally connected at the relative fitting portion 12 by a connecting member 13. In this case, a sand falling path 12a is secured in the relative fitting portion 12. Further, a cylinder 14 is fitted onto the upper end of the rotary outer cylinder 11b so as to be relatively slidable and rotatable, and the upper end of the cylinder 14 is flange-bonded to the lower end of the cylinder 7. That is, the cylinder body 7 and the rotating inner cylinder 11a are connected via the swivel joint mechanism 15, and this mechanism rotates the rotating inner cylinder 11a and the rotating cylinder 11b while the hopper 6 and the cylinder are connected. Sand can be fed into the rotating outer cylinder 11b through the body 7. Furthermore, the rotary outer cylinder 11b is provided with a spiral protrusion 16 on its outer circumferential surface, and is provided with a well-known excavating blade body 17 that can be opened at its lower end.

18 indicates a second rotational drive device. This second rotation drive device 18 includes a drive motor 19 installed on the upper mounting base 4 of the mounting frame 2, and a drive motor 19 installed on the upper mounting base 4 of the mounting frame 2.
A disc 20a is fixed to the output shaft 19a of the disc 20a, and its upper end is connected to a pin 21a at an eccentric position of the disc 20a.
Connecting link 2 pivotably supported by
It consists of 0b. On the other hand, 22 indicates a push rod, and this push rod 22 is inserted into the inner rotating cylinder 11a and the outer rotating cylinder 11b, and its upper end is connected to the hollow output shaft 9 of the reducer 9.
The connecting link 20b is inserted through the connecting link 20b in a loosely fitted manner.
is connected to the lower end portion of by a pin 21b so as to be relatively swingable. Here, the two pins 21 mentioned above
a and 21b are provided so as to be parallel and horizontal to each other, as clearly shown in FIG. Therefore, the disc 20a and the connecting link 20b
A crank mechanism 20 is constructed, and the action of this crank mechanism 20 converts the rotational movement of the second rotational drive device 18 into a linear vertical movement of the thrust rod 22. The vertical movement stroke S of the push rod 22 is
The length is equal to twice the distance R from the center of rotation _P1 of the disk 20a to the pin 21a. Also, push rod 2
2 also has a vibrator 23 operated by air pressure at its lower end.

Next, reference numeral 24 denotes an elevating drive device for elevating the mounting frame 2 along the leader 1, and this is attached to the leader 1 side by a support stand (not shown).

Above, the procedure for constructing sand piles will be explained.

First, after erecting leader 1 at the construction site,
The mounting frame 2 is lowered along the leader 1 while driving the rotation drive device 8. In this case, the rotational force equivalent to the sum of the outputs of the two drive motors 10, 10 of the first rotation drive device 8 is transmitted to the rotation inner cylinder 11a and the rotation outer cylinder 11b via the reduction gear 9, and the rotation Since the spiral protrusion 16 is actually provided on the outer peripheral surface of the outer cylinder 11b and the blade body 17 for excavation is provided at the lower end thereof, the rotary outer cylinder 11b is moved to the ground ( (not shown). At this time, if necessary, the second rotary drive device 18 is driven, and the crank mechanism 20 converts the rotational motion into linear motion and transmits it to the thrust rod 22, causing the thrust rod 22 to reciprocate up and down. let

In this way, after the rotary outer cylinder 11b is inserted into the ground until it reaches a predetermined depth, the first rotary drive device 8 is stopped. Subsequently, while feeding sand for pile construction through the hopper 6 to the bottom of the rotary outer cylinder 11b, the thrust rod 22 is reciprocated up and down by the action of the second rotational drive device 18 and the crank mechanism 20, and as described above. The sand is compacted at the bottom of the rotating outer cylinder 11b. In addition, in parallel with the sand feeding and tamping work, the mounting frame 2 is raised and the rotary outer cylinder 11b is gradually cut out as sand pile construction progresses, so that the blade body 17 is Opened by an opening structure,
The tamped sand pile is left in the ground through this opening. Further, when compacting the sand, if necessary, the vibrator 23 is operated to stir the sand. In this way, the compacted state of the sand is made more uniform, so that a stronger sand pile can be created.

In the above, as a result of pulling out the rotary outer cylinder 11b according to the progress of sand pile construction,
During the tamping of sand by the ramming rod 22, the sand is isolated from the surrounding ground at the lower end of the rotary outer cylinder 11b, so the ramming force of the ramming rod 22 acts effectively on the sand, and the surrounding ground does not have a negative impact on Therefore, strong sand piles are constructed. Furthermore, the push rod 22
The vertical stroke of is twice the distance R between the center of rotation of the disc 20a and the pin 21a, so it is effective for compacting the sand, and the reciprocating speed of the tamping rod 22 is It is easy to increase the speed of sand piles, and this, combined with the above-mentioned factors, is useful for building strong sand piles.

Therefore, according to the present invention, the rotary outer cylinder 11b in contact with the ground is rotated by the first rotational drive device 8, and a protrusion 16 is provided in a spiral shape on the outer peripheral surface of the rotary outer cylinder 11b. Because it is protruding, when inserting the rotary outer cylinder 11b into the ground,
In addition to being able to reduce friction between the rotor and the ground, the spiral protrusion provides a digging action, and even if there is some hard soil in the ground, the rotary outer cylinder 11b can be inserted smoothly. can.

Moreover, according to the present invention, even though the rotary outer cylinder 11b rotates, sand is smoothly fed into the rotary outer cylinder 11b from the sand charging hopper 6 attached at a fixed position through the sand falling passage 12a. In addition, since the first rotary drive device 8 and the rotary outer cylinder 11b rotated thereby are connected by the hollow output shaft 9a and the rotary inner cylinder 11a, it is possible to The push rod 22 is passed through the hollow output shaft 9a and the rotating inner cylinder 11a, and the upper end of the push rod 22 is connected to the second rotation drive device 18 and the crank mechanism 20 connected thereto, and the lower end thereof is connected to the second rotation drive device 18 and the crank mechanism 20 connected thereto. They can be provided coaxially within the rotary outer cylinder 11b, allowing the push rod 22 to move up and down smoothly within the rotary outer cylinder 11b.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially cutaway sectional view, and FIG. 2 is a front view of the crank mechanism. DESCRIPTION OF SYMBOLS 1... Leader, 2... Mounting frame, 8... First rotation drive device, 9a... Hollow output shaft, 11a... Rotating inner cylinder, 11b... Rotating outer cylinder, 12a... Sand falling passage, 13... ... Connection member, 15 ... Swivel joint mechanism, 16 ... Protrusion, 18 ... Second rotation drive device, 20 ... Crank mechanism, 22 ... Push rod,
23... Vibrator.

Claims (1)

[Claims] 1. A mounting frame 2 that is supported and guided by a leader 1 and moves up and down.
A first rotary drive device 8 and a second rotary drive device 18 are installed in the hollow output shaft 9a of the first rotary drive device 8.
A rotary inner cylinder 11a that rotates integrally with the inner cylinder 11a is provided in a protruding manner, and a rotary outer cylinder 11b that rotates integrally with the inner cylinder 11a via a connecting member 13 is attached to both the inner and outer cylinders 11.
A and 11b are provided vertically downward with a sand falling passage 12a, and a protrusion 16 is provided in a spiral shape on the outer peripheral surface of the rotary outer cylinder 11b, and a swivel joint mechanism is provided in the sand falling passage 12a. 15 to the sand charging hopper 6, while the sand falling passage 1
A tamping rod 22 for compacting the sand fed into the rotary outer cylinder 11b through the hollow output shaft 9
a and the rotating inner cylinder 11a so as to be movable up and down.The upper end of the thrust rod 22 is connected to the second rotational drive device 18, and the rotational movement of the drive device is connected to the thrust rod 2.
Crank mechanism 20 for converting into vertical movement of 2
A sand pile construction device connected via a sand pile construction device. 2. The sand pile construction device according to claim 1, wherein a vibrator 23 is attached to the lower end of the thrust rod 22.