JPH0552084A - All-casing boring machine - Google Patents

Abstract

PURPOSE:To prevent the subsidence of the ground surface and prevent the increase of the weight and size of a boring machine main body. CONSTITUTION:The glove 8 of a glove bucket 6 is opened, a heavy bob 17 is lowered along a piston 19, and the glove bucket 6 is freely dropped in a casing tube 9 while the upper section of the heavy bob 17 is kept in contact with the piston 19. The lower section of the heavy bob 17 collides with the projection 16 of a casing tube 9, and the casing tube 9 is inserted into the ground by the dropping energy of the heavy bob 17. The piston 19 is freely dropped along the cavity 18 of the heavy bob 17 after the heavy bob 17 collides with the projection 16 of the casing tube 9. The glove 8 of the glove bucket 6 is inserted into sediment 12, when the tip of the glove 8 reaches the vicinity of the tip 11 of the casing tube 9 and the piston 19 collides with the lower section of the cavity 18 of the heavy bob 17, the dropping of the piston 19 and the glove bucket 6 is stopped to complete the excavation. The glove 8 is closed, and the soil discharging process is started.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an all-casing boring machine for excavating earth and sand in a casing tube pushed into the ground by a pushing device by a grab bucket suspended and supported by a wire.

[0002]

2. Description of the Related Art A conventional all-casing boring machine will be described with reference to FIGS. 5 to 7. 1'in FIG. 5 is a traveling device, and a boring machine body 2'is mounted on the traveling device 1 '. A boom 3'is provided on the main body 2 ', and a pulley 4'is attached to the upper end of the boom 3'.

7'is the above boring machine body 2 '.
The winch 5'installed above is a wire hanging from the winch 7'through the pulley 4 ', and a grab bucket 6'is suspended and supported by the wire 5'. As shown in FIGS. 5 to 7, a grab 8'is attached to be openable and closable. 9'is a casing tube and 10 'is a pushing device attached to the machine body 1'.

In the conventional all casing boring machine shown in FIGS. 5 to 7, the casing tube 9'is pushed into the ground by the pushing device 10 ', and then the wire 5'is loosened and the glove 8'is left open. The grab bucket 6'is dropped into and penetrates the earth and sand in the casing tube 9 ', the earth and sand 12' is excavated (see FIG. 6), and then the wire 5'is pulled to close the grab 8'of the grab bucket 6 '. Grab bucket 6'of excavated earth and sand
Then, the wire 5'is continuously pulled, the grab bucket 6'is pulled up (see FIG. 7), the grab 8'is opened, and the excavated earth and sand 12 'is discharged.

After that, the casing tube 9'is pushed in, and the grab bucket 6'is repeatedly dropped and pulled up to excavate to a predetermined depth.

[0006]

In the conventional all-casing boring machine shown in FIGS. 5 to 7, the wire 5'is loosened and the grab bucket 6'with the glove 8'opened as shown in FIG. When the earth / sand 12 ′ is excavated by dropping and penetrating the earth / sand 12 ′ in the casing tube 9 ′, the distance L ₀ ′ between the blade edge 11 ′ of the casing tube 9 ′ and the blade edge of the grab 8 ′ of the grab bucket 6 is set. Since there is no means for restricting, the blade tip of the grab 8'of the grab bucket 6 may precede the blade tip 11 'of the casing tube 9'and excavate too much earth and sand deeper than the blade tip 11' of the casing tube 9 '.

In such a case, the casing tube 9 '
The cutting face 13 'deeper than the blade edge 11' collapses due to the surrounding earth pressure, and as a result, the surrounding sediment 14 'moves as shown by the arrow, so that the ground surface subsidence 15' occurs. In addition, the pushing device 10 'is used to penetrate the casing tube 9', but in this case, since the pushing reaction force is taken by the weight of the boring machine, the ground strength is low and the penetration of the casing tube 9'is not possible. It should be done easily, but if the ground is hard and the penetration of the casing tube 9'is difficult, the boring machine body 2'is lifted and the penetration of the casing tube 9'is impossible. . Therefore, the weight of the boring machine body 2'has to be increased, and there is a problem that the boring machine body 2'becomes larger than necessary.

The present invention has been proposed in view of the above problems, and the object thereof is to prevent ground surface subsidence. Another point is to provide an all-casing boring machine that can prevent the boring machine body from increasing in weight and increasing in size.

[0009]

In order to achieve the above object, the present invention provides an all-casing boring machine for excavating earth and sand in a casing tube with a grab bucket suspended and supported by a wire, above the grab bucket. A piston is provided, and the weight is vertically movably supported by the piston, and a projection is provided on the inner peripheral surface of the casing tube for abutting against the lower end of the weight to prevent deep digging of the grab bucket.

[0010]

The all-casing boring machine of the present invention is constructed as described above, and instead of penetrating the casing tube into the ground by the pushing device, the casing tube is penetrated by the falling energy of the weight, and then the casing tube is prepared by the falling energy of the grab bucket. Excavate the soil inside. That is, open the grab of the grab bucket, lower the weight along the piston, let the upper part of the weight contact the piston, and let the grab bucket fall freely into the casing tube, and lower the weight to the casing tube. The casing tube penetrates into the ground due to the falling energy of the weight at this time. After the weight collides with the protrusion of the casing tube, the piston freely falls along the cavity of the weight, the grab of the grab bucket penetrates into the ground, and the blade edge of the grab reaches the vicinity of the blade tip of the casing tube. Occasionally, the piston collides with the lower part of the cavity of the weight to stop the piston and the grab bucket from falling, and the excavation is completed.

[0011]

EXAMPLE An all-casing boring machine of the present invention will now be described with reference to an example shown in FIGS. 1 to 4.
5 is a wire, 6 is a grab bucket suspended and supported by the wire 5, 8 is a grab provided at the bottom of the grab bucket 6, 19 is a piston provided at the upper part of the grab bucket 6, 17 is a weight 18 is the same weight. In the cavity provided in 17, the piston 19 is fitted in the cavity 18, and the weight 17 is supported by the piston 19 so as to be vertically movable.

Reference numeral 9 denotes a casing tube, 11 a cutting edge of the casing tube 9, and 16 a casing tube 9 thereof.
The protrusions 12 provided on the inner peripheral surface of the are the earth and sand of the ground. Next, the operation of the all-casing boring machine shown in FIGS. 1 to 4 will be specifically described. Casing tube 9
Instead of penetrating the ground into the ground with a pushing device, the weight 17
The falling energy of the grab bucket 6 causes the earth and sand 12 in the casing tube 9 to be excavated. That is, as shown in FIG. 2, the grab 8 of the grab bucket 6 is opened, the weight 17 is lowered along the piston 19, and the glove bucket 6 is brought into contact with the piston 19 while the glove bucket 6 is in contact with the casing tube 9. The lower part of the weight 17 is abutted against the projection 16 of the casing tube 9, and the weight 1 at this time is dropped.
Casing tube 9 penetrates into the ground by the falling energy of 7. Then, after the weight 17 collides with the protrusion 16 of the casing tube 9, the piston 19 is allowed to fall freely along the cavity 18 of the weight 17 to penetrate the grab 8 of the grab bucket 6 into the sand 12 and to cut the blade edge of the grab 8. When the blade reaches the vicinity of the blade edge 11 of the casing tube 9, the piston 19 is abutted against the lower portion of the cavity 18 of the weight 17 as shown in FIG. 3, and the dropping of the piston 19 and the grab bucket 6 is stopped to complete the excavation.

When this state is reached, the grab 8 is closed as shown in FIG. 4 and the earth unloading process is started. At this time, the ascending piston 19 of the grab bucket 6 supports the weight 17 from below and raises the weight 17.

[0014]

According to the all-casing boring machine of the present invention, instead of intruding the casing tube into the ground by the pushing device as described above, it is penetrated by the falling energy of the weight and then the earth and sand in the casing tube by the falling energy of the grab bucket. To drill. That is,
Open the grab of the grab bucket, lower the weight along the piston, and while the upper part of the weight is in contact with the piston, let the grab bucket fall freely into the casing tube, and place the lower part of the weight on the protrusion of the casing tube. The casing tube penetrates into the ground due to the impact energy of the weight at this time. After the weight collides with the protrusion of the casing tube, the piston freely falls along the cavity of the weight, the grab of the grab bucket penetrates into the ground, and the blade edge of the grab reaches the vicinity of the blade tip of the casing tube. Occasionally, the piston collides with the lower part of the cavity of the weight to stop the piston and grab bucket from falling and complete the excavation.Therefore, the blade edge of the grab of the grab bucket does not precede the blade edge of the casing tube, and as a result, the casing It is possible to prevent ground subsidence without causing the face of the tube deeper than the cutting edge to collapse due to the surrounding earth pressure.

Further, as described above, the grab bucket is allowed to fall freely into the casing tube, the lower part of the weight is brought into contact with the projection of the casing tube, and the casing tube penetrates into the ground. Therefore, the pushing reaction force of the casing tube is reduced. Since it is not necessary to take the weight of the boring machine, it is possible to prevent the boring machine body from increasing in weight and increasing in size.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of an all-casing boring machine according to the present invention.

FIG. 2 is a vertical cross-sectional side view showing a penetration state of a casing tube of the all-casing boring machine.

FIG. 3 is a vertical cross-sectional side view showing a penetration stop state of a grab bucket of the all-casing boring machine.

FIG. 4 is a vertical cross-sectional side view showing a state in which the grab bucket of the all-casing boring machine is carried out of earth and sand.

FIG. 5 is a side view showing a conventional all-casing boring machine.

FIG. 6 is a vertical sectional side view showing a penetration state of a grab bucket of the all-casing boring machine.

FIG. 7 is a vertical cross-sectional side view showing a state in which the grab bucket of the all-casing boring machine is carried out of earth and sand.

FIG. 8 is a vertical sectional side view showing a deeply dug state of a grab bucket of the all-casing boring machine.

[Explanation of symbols]

 5 Wire 6 Grab Bucket 9 Casing Tube 12 Sediment 16 Protrusion 17 Weight 18 Cavity 17 Weight 19 Piston

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shunichi Honma 2-8-25 Niihama, Arai-cho, Takasago, Hyogo Prefecture Takahishi Engineering Co., Ltd.

Claims (1)

[Claims] 1. In an all-casing boring machine for excavating earth and sand in a casing tube with a grab bucket suspended and supported by a wire, a piston is provided above the grab bucket and a weight is supported by the piston so as to be vertically movable, An all-casing boring machine, characterized in that a projection is provided on the inner peripheral surface of the casing tube for abutting against the lower end of the same weight to prevent deep digging of the grab bucket.