JPH108870A - Shaft excavating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To press in a hollow casing always vertically regardless of the attitude of a traveling truck and rapidly absorb reaction generated at the time of pressing in. SOLUTION: This shaft excavating device is so constituted that a press-in head 2 for pressing a hollow casing into the ground by full arc turning or oscillatory turning is connected to a traveling truck 1. In this case, the traveling truck 1 and the press-in head 2 are connected through a shifter 3 connected at its base end to the traveling truck 1 while being vertically oscillated on the tip side and put in turning action around a traveling shaft of the traveling truck 1. The shifter 3 is provided with a base 4 with its base end connected to the front face of the traveling truck 1 by a pin 46 with a horizontal axis, and a front block 5 provided at the base 4 and connected rotatably around a supporting shaft with its axis arranged orthogonally to the axis of the pin 46. The press-in head 2 can be operated to elevate at the tip of the front block 5 through an elevating cylinder 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft excavation apparatus for excavating underground in order to construct a shaft, a well, a cast-in-place pile, and the like for transmitting and reaching a propulsion excavation in a sewer propulsion excavation work.

[0002]

2. Description of the Related Art In the excavation work of a shaft, a hollow casing using a steel pipe is cast into the ground, and the shaft is excavated to a predetermined depth while preventing collapse of a hole wall by the hollow casing. That is the basis. Conventionally, an apparatus for excavating a shaft has a drive mechanism that presses a hollow casing into the ground and a bucket that is inserted into the hollow casing and excavates and collects internal soil. It's being used.

FIG. 7 is a schematic view showing the construction of a conventional shaft excavator, in which a boom 51a is connected to a traveling vehicle 51, and a grab bucket 5 is provided at the tip of the booth 51a.
1b is suspended. And this graph bucket 5
1b, a circular hollow casing 50 is driven into the ground, and the hollow casing 50 is also driven deep into the ground according to the excavation depth. Can be excavated.

[0004] The casting of such a hollow casing 50 is performed as follows.
It is performed by press-fitting the hollow casing 50 into the ground while twisting or rotating the hollow casing 50 by a conventionally known swinging type or all-round turning type. In the illustrated example, a swing-type press-fitting machine 52 is connected to the front side of the traveling vehicle 51 for press-fitting the hollow casing 50.

[0005] The swing-type press-fitting machine 52 is mainly composed of a hollow casing 50 and a clamp frame 52a.
The peripheral surface of the hollow casing 50 is constrained to reciprocate around the axis of the hollow casing 50, and a load is applied in the ground direction, whereby the hollow casing 50 is pressed into the ground so as to be twisted. The clamp frame 52a is connected to the traveling vehicle 51 by a pin 52b having a horizontal axis so that the front end thereof can swing vertically, and an outrigger 52c for setting a posture is provided on the lower surface of the front end. And reaction force weight 5 for press-fitting load
2d is provided.

[0006]

However, the distal end of the clamp frame 52a swings up and down, and the posture is merely set by the outrigger 52c. For this reason, the traveling vehicle 51 is
In the case where the ground is inclined to the lower left or lower right with respect to the traveling direction, the posture of the clamp frame 52a cannot be set horizontally even if the height is adjusted by the outrigger 52c.

In this case, there is a restriction that the driving direction of the hollow casing 50 must be set in the vertical direction. Therefore, the hollow casing 50 has a difference in expansion and contraction length of several press-fitting cylinders 52e provided on the clamp frame 52a. It is possible to correspond by attaching. However, when a further inclination occurs, the clamp frame 52a or the traveling vehicle 51
Concentration of the load is caused by the occurrence of twisting or bending at the connection portion with the wire. For this reason, it is necessary to correct the posture of the traveling vehicle 51 by laying wood or the like on the crawler belt of the traveling vehicle 51 to cope with the situation.

[0008] On the other hand, in the case of a shaft excavator with a full-rotation floor, the hollow casing 50 is directly connected to the press-fitting head of the shaft excavator and turns, so that the horizontal installation of the press-fitting head is more severely required and is simple. Correction of the posture of the traveling vehicle 51 cannot be dealt with, and a special buffer mechanism or the like is required.

When the hollow casing 50 is press-fitted by swinging the clamp frame 52a, it is necessary to absorb the reaction force of the swinging torque and the reaction force of the press-fitting.
Absorption of the reaction force of the oscillating torque utilizes the frictional force of the traveling vehicle 51 due to its own weight and the distance from the hollow casing 50. Although the reaction force of the press input is also taken by the reaction force weight 52d, the stacking amount is limited. Therefore, as a result, it is not possible to cope unless a part of the own weight of the traveling vehicle 51 is used as the reaction force receiver.

It is an object of the present invention to provide a shaft excavator capable of always press-fitting a hollow casing in a vertical direction irrespective of the posture of a traveling vehicle and capable of quickly absorbing a reaction force at the time of press-fitting.

[0011]

SUMMARY OF THE INVENTION The present invention relates to a shaft excavation apparatus for connecting a press-fitting head for press-fitting a hollow casing into the ground by full-circle or rocking rotation to a traveling bogie,
It is characterized in that the base end is connected to the traveling vehicle, the distal end side thereof can swing up and down, and the traveling vehicle and the press-fit head are connected via a shifter that can pivot around the traveling axis of the traveling vehicle. And

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In such a configuration, the shifter has a base connected to a front end of a traveling carriage by a pin having a horizontal axis at a front end thereof, and an axial arrangement provided on the base and orthogonal to the axis of the pin. And a front block rotatably connected around the support shaft, and the press-fit head can be moved up and down at the tip of the front block via a lifting cylinder.

[0013]

1 is a right side view showing an outline of an entire shaft excavating apparatus according to the present invention, and FIG. 2 is a plan view of a main part.

In FIG. 1, a traveling vehicle 1 having a crawler belt 1a is shown.
In the same manner as in the prior art, the boom 1b is connected so as to be able to pivot and tilt, and a club bucket 1d is attached to the tip of the boom 1b via a wire rope 1c to operate the boom 1b and the wire rope 1c. Thereby, the earth and sand in the hollow casing 50 can be excavated by the club bucket 1d. In addition, a press-fit head 2 of a full rotation type is arranged in front of the traveling vehicle 1, and a shifter 3 is connected between the press-fit head 2 and the traveling vehicle 1.

FIG. 3 is a cutaway view showing a main part of the press-fit head 2.
FIG. 4 is a plan view thereof.

Inside the press-fitting head 2, a band 2c is assembled between the lower bed 2a and the upper bed 2b and can be assembled in a ring by three members. The band 2c is located at the right end of the bed 2b in the drawing. An annular spur gear 2d integrally fixed to the member is rotatably supported by a bearing 2e provided on the upper bed 2b. This spur gear 2d is the upper bed 2
B engages with a pinion 2f-1 attached to the output shaft of a drive motor 2f with a speed reducer fixed on b, thereby enabling the band 2c to rotate around its axis. Also,
The tightening cylinder 2g is attached to one end of the remaining two members of the band 2c, and the band 2c is connected to the end of the other member to connect the band 2c to the other end of the band 2c.
As shown in the figure, the hollow casing 50 is assembled into an annular shape, thereby being tightly connected to the outer peripheral surface of the hollow casing 50 and driven to rotate.

Further, between the upper and lower beds 2a and 2b, a total of four press-fitting / pulling-out jacks 2h are attached.
Outrigger 2 is attached to lower bed 2b on the same axis as these.
i is provided. Further, four stages of reaction force weights 2j are respectively loaded on both ends in the width direction when viewed from the front, which are edges opposite to the shifter 3.

Returning to FIGS. 1 and 2, the shifter 3 comprises a base 4 connected to the traveling vehicle 1 and a front block 5 connected to the press-fit head 2 side.
The base 4 projects two brackets 4a on the surface facing the traveling vehicle 1 at intervals in the width direction, and these brackets 4a are provided on the traveling vehicle 1 as a pair of two flanges 1e.
And connected by a pin 4b. The pin 4b has an axis parallel to the running surface of the crawler belt 1a of the traveling vehicle 1 and is arranged in a direction orthogonal to the traveling direction of the traveling vehicle 1.

As shown in FIG. 2, the front block 5 is connected via a support shaft 4c projecting forward from the center of the base 4 in the width direction. The support shaft 4c is, for example, a T-shape having a flange 4d formed on the distal end side as shown in the figure, and its axis is arranged orthogonal to that of the pin 4b.
And a connecting seat 5a rotatable around the support shaft 4c is provided.

Further, the front block 5 includes the press-fit head 4
Sliding grooves 5b having a wedge-shaped cross-sectional shape are formed at the left and right ends as viewed from the front side over the entire length in the vertical direction, and these sliding grooves 5b are formed in the sliding grooves 5b from the end face of the press-fit head 2. The protruding slider 2k is inserted and connected to be slidable in the vertical direction. In the center of the front end of the front block 5, an elevating cylinder 6 is disposed with its rod 6a facing downward and aligned with the cutting direction of the sliding groove 5b, and the lower end of this rod 6a is connected to the press-fit head 2. I do.

In the above configuration, the hollow casing 50
As in the case of the conventional full-rotation type excavator, the traveling bogie 1 is constrained around the hollow casing 50 by the band 2c of the press-fitting head 2 and rotates the hollow casing 50 together with the band 2c by the drive motor 2f. And presses into the ground using the weight of the reaction force weight 2j and the weight of the reaction force weight 2j.

When press-fitting the hollow casing 50, it is necessary to set the axis of the hollow casing 50 to a vertical posture, and therefore, the band 2c of the press-fitting head 2 is required.
Must always be set in a horizontal position. By using the movement of the shifter 3 for setting the attitude of the press-fitting head 2, the axis of the hollow casing 50 held by the band 2 c can be adjusted no matter how the attitude of the traveling vehicle 1 changes. It can always be set to the vertical position.

That is, the base 4 of the shifter 3 is
1, the front end side of the front block 5 in FIG. 1 that is connected to the press-fit head 5 can swing up and down. And
Since the front block 5 is rotatable with respect to the base 4 by the support shaft 4c, the front block 5 can be tilted in the width direction with respect to the running surface of the crawler belt 1a. It can also be set to a twisted position.

By the movement of the shifter 3 as shown in FIG.
As shown in the figure, for example, even when the ground on which the crawler belt 1a of the traveling vehicle 1 is mounted is downward-sloping and the ground where the hollow casing 50 is driven is horizontal.
If the base 4 is slightly inclined downward as compared with FIG. 1, the front block 5 can be set horizontally with the ground to be cast. Then, even when the ground on which the crawler belt 1a rests is inclined in a direction perpendicular to the drawing, when the outrigger 2i of the press-fitting head 2 lands, the front block 5 rotates around the support shaft 4c and changes its posture. Change. Accordingly, the attitude of the press-fit head 2 can be set parallel to the ground on which the vehicle is driven, regardless of the attitude of the traveling vehicle 1.

The variation of the height of the ground to be driven with respect to the shifter 3 is controlled by changing the level of the press-fitting head 2 by operating the lift cylinder 6 and adjusting the height of the outrigger 2i. The head 2 can be set to an appropriate posture.

As described above, the posture of the press-fit head 2 is set to be horizontal with respect to the ground to be driven, regardless of the inclination of the traveling vehicle 1, and the band 2c restrains the periphery of the hollow casing 50 which is inserted vertically. Thus, the hollow casing 50 can always be driven in a correct posture. The change in the attitude of the press-fit head 2 is all due to the operation of the shifter 3, which is a combination of the vertical swing of the base 4 around the pin 4b and the tilting of the front block 5 around the support shaft 4c. The press-fit head 2 can be easily set to a posture that naturally follows the ground, and an excessive load does not act on a portion connected to the traveling vehicle 1 or the like.

Further, the reaction force acting upon the press-fitting of the hollow casing 50 is directly transmitted to the traveling vehicle 1 via the shifter 3, so that the weight of the traveling vehicle 1 itself can be used as a reaction force receiver. For this reason, the weight load to be borne by the reaction weight 2j provided in the press-fit head 2 can be reduced, and the work load such as loading and loading of the reaction weight 2j can be reduced.

When moving the traveling vehicle 1,
If the press-fit head 2 is lifted to the boom 1b side by the wire 7 as shown in FIG. 6, the shifter 3 connected to the traveling carriage 1 side by the pin 4b can be bent upward like a joint, The traveling of the traveling vehicle 1 is also facilitated.

Although the embodiment has been described with respect to the press-fit head of the full-circle swivel type, the same applies to the press-fit head of the swing type instead of this.

[0030]

According to the present invention, the attitude is set by the shifter interposed between the traveling vehicle and the press-fitting head so that the press-fitting head follows the casting ground of the hollow casing regardless of the attitude of the traveling vehicle. be able to. Therefore, even if the situation of the ground on the site is complicated, if the press-fit head is placed on a horizontal surface only around the casting ground, the hollow casing can be reliably cast in the vertical direction, Good shaft excavation becomes possible.

When the press-fit reaction force is transmitted to the traveling vehicle via the shifter, the own weight of the traveling vehicle can be used as a reaction force receiver, and the number of reaction force weights loaded on the press-fit head can be reduced. Work load can be reduced.

[Brief description of the drawings]

FIG. 1 is a right side view showing an outline of a shaft excavator according to the present invention.

FIG. 2 is a cutaway plan view of a main part showing a connection structure of a press-fit head to a traveling vehicle.

FIG. 3 is a longitudinal sectional view of a main part including a swivel mechanism of a band of the press-fit head.

FIG. 4 is a schematic plan view showing a main part of the press-fit head.

FIG. 5 is a right side view showing the setting of the position of the press-fit head on the casting surface when the traveling vehicle is located on a downwardly inclined surface.

FIG. 6 is a right side view showing a state where the press-fit head is lifted by a wire for moving the traveling vehicle.

FIG. 7 is a view showing shaft excavation by a conventional shaft excavation apparatus.

[Explanation of symbols]

 1: Traveling trolley 2: Press-fit head 2c: Band 2d: Spur gear 2e: Bearing 2f: Drive motor 2g: Tightening cylinder 2i: Outrigger 2j: Reaction weight 2k: Slider 3: Shifter 4: Base 4a: Bracket 4b : Pin 4c: Support shaft 4d: Flange 5: Front block 5a: Connecting seat 5c: Sliding groove 6: Lifting cylinder 50: Hollow casing

Claims (2)

[Claims] 1. A shaft excavation device for connecting a press-fitting head for press-fitting a hollow casing into the ground by full-turning or rocking turning to a traveling bogie, the base end of which is connected to the traveling bogie, and the tip end of which is vertically moved. A shaft excavation device comprising a traveling bogie and a press-fitting head connected via a shifter which is swingable around the traveling axis of the traveling bogie. 2. The shifter is rotatable around a base having a base end connected to a front surface of the traveling vehicle by a pin having a horizontal axis, and a support shaft provided on the base and arranged in an axis perpendicular to the axis of the pin. With a front block connected to the
2. The shaft excavator according to claim 1, wherein the press-fit head can be moved up and down at the tip of the front block via a lifting cylinder.