JP3400645B2 - Shaft excavator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft excavating device for excavating underground for constructing shafts and wells and cast-in-place piles for starting and reaching of propulsive excavation in sewer seismic excavation work.

[0002]

2. Description of the Related Art In shaft digging work, a hollow casing using a steel pipe is placed in the ground, and the hollow casing prevents the wall of the hole from collapsing while the shaft is drilled to a predetermined depth. That is the basis. And, as a device for this shaft excavation, a device including a drive mechanism for press-fitting a hollow casing into the ground and a bucket for excavating and collecting earth and sand inside the hollow casing has been generally known. It's being used.

[0003] Figure 7 is a schematic diagram showing the construction status of the conventional vertical shaft drilling apparatus, when articulating boom 51a in the traveling carriage 51 in both the tip of the boom 51a is suspended graphene bucket 51b. The circular hollow casing 50 is used for excavation by the graph bucket 51b.
Is driven into the ground, and the hollow casing 50 is also driven deep into the ground according to the excavation depth, and a vertical shaft having a desired depth can be excavated by stacking a predetermined number.

The placement of such a hollow casing 50 is as follows.
It is performed by press-fitting into the ground with or rotating twisted hollow casing 50 by the swinging type or the entire circumference pivoting are known in the art. Further, in the illustrated example, the swing type press-fitting machine 52 is connected to the front side of the traveling carriage 51 in order to press-fit the hollow casing 50.

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 reciprocally swing around the axis of the hollow casing 50, and a load is applied in the underground direction, so that the hollow casing 50 is screwed into the ground and press-fitted. Then, the clamp frame 52a is connected to the traveling carriage 51 by a pin 52b having a horizontal axis, and the tip side of the clamp frame 52a can be vertically swung, and an outrigger 52c for setting the posture is provided on the lower surface of the tip side. Together with reaction force weight 5 for press-fitting load
2d is provided.

[0006]

However, the tip end side of the clamp frame 52a oscillates in the vertical direction, and the posture thereof is only set by the outrigger 52c. Therefore, the traveling carriage 51 is not shown in the figure.
If there is an inclination of the ground such that the ground is inclined to the left or to the 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 in the clamp frame 52a. It is possible to respond by adding. However, when a further inclination occurs, the clamp frame 52a and the traveling carriage 51 are
Twisting, bending, etc. are generated at the connecting portion with and the concentration of load is caused. Therefore, it is necessary to lay the crawler belt of the traveling carriage 51 with wood or the like to correct the posture of the traveling carriage 51 to cope with the situation.

[0008] On the other hand, in the case of a full-circle turning type vertical shaft excavator,
Since the hollow casing 50 is directly connected to the press-fitting head of the vertical shaft excavator and swivels, horizontal installation of the press-fitting head is required more severely, and a simple warming mechanism or the like cannot be dealt with by simple posture correction of the traveling carriage 51. Will be required.

When the hollow casing 50 is press-fitted by rocking the clamp frame 52a, it is necessary to absorb the reaction force of the rocking torque and the reaction force of the pressure input.
The reaction force of the swinging torque is absorbed by using the frictional force due to the weight of the traveling carriage 51 and the distance from the hollow casing 50. Although the reaction force of the pressure input is also taken by the reaction force weight 52d, there is a limit to the stacking amount. Therefore, as a result, a part of the own weight of the traveling vehicle 51 cannot be used as a reaction force receiver.

The problem to be solved in the present invention is to provide a shaft excavating device capable of always press-fitting a hollow casing in a vertical direction regardless of the posture of a traveling carriage and rapidly absorbing a reaction force at the time of press-fitting.

[0011]

The present invention relates to a shaft excavating device for connecting a press-fitting head for press-fitting a hollow casing into the ground by full-circling or swinging swivel to a traveling carriage.
It is characterized in that the base end is connected to the travel carriage and the tip end side can be vertically swung, and the travel carriage and the press-fitting head are connected via a shifter capable of turning around the travel axis of the travel carriage. And

[0012]

In such a structure, the shifter has a base having a base end connected to a front surface of a traveling carriage by a pin having a horizontal axis, and an axial line arrangement provided on the base and orthogonal to the axis of the pin. It is also possible to provide a front block rotatably connected around the support shaft, and further to enable the press-fitting head to be moved up and down through a lifting cylinder at the tip of the front block.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a right side view showing an outline of the entire shaft excavating device of the present invention, and FIG. 2 is a plan view of a main part.

In the figure, a traveling carriage 1 having a crawler belt 1a.
In the same manner as in the conventional example, the boom 1b is connected so as to be pivotable and tiltable, 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. This makes it possible to excavate the earth and sand in the hollow casing 50 by the club bucket 1d. An all-round turning press-fitting head 2 is arranged in front of the traveling carriage 1, and a shifter 3 is connected between the press-fitting head 2 and the traveling carriage 1.

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

A band 2c, which can be assembled in an annular shape by three members, is installed between the lower bed 2a and the upper bed 2b inside the press-fitting head 2, and is located at the right end in the figure in this bed 2b. 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
It engages with a pinion 2f-1 attached to the output shaft of a drive motor 2f with a reduction gear fixed on b, and thereby enables the band 2c to be rotationally driven about its axis. Also,
The tightening cylinder 2g is attached to one end of one of the remaining two members of the band 2c, and the tightening cylinder 2g is connected to the other end of the other member so that the band 2c can be moved as shown in FIG.
As shown in FIG. 3, the hollow casing 50 is assembled in an annular shape, which is tightly connected to the outer peripheral surface of the hollow casing 50 and is driven to rotate.

Further, a total of four press-fitting / withdrawing jacks 2h are attached between the upper and lower beds 2a and 2b, and
Outrigger 2 is attached to lower bed 2b coaxially with these.
i is provided. Then, four stages of reaction force weights 2j are loaded on both edges of the side opposite to the shifter 3 in the width direction when viewed from the front.

1 and 2, the shifter 3 is composed of a base 4 connected to the traveling carriage 1 side and a front block 5 connected to the press-fitting head 2 side.
The base 4 has two brackets 4a protruding from the surface facing the traveling carriage 1 at intervals in the width direction, and these brackets 4a are provided on the traveling carriage 1 to form a pair of flanges 1e.
It is inserted in and is connected by a pin 4b. The pin 4b has an axis parallel to the traveling surface of the crawler belt 1a of the traveling carriage 1 and is arranged in a direction orthogonal to the traveling direction of the traveling carriage 1.

As shown in FIG. 2, the front block 5 is connected through a support shaft 4c protruding forward from the center of the base 4 in the width direction. The spindle 4c is, for example, a T-shaped one having a flange 4d formed on the tip side as shown in the drawing, and its axis is arranged orthogonally to that of the pin 4b.
The connecting seat 5a is provided so as to be rotatable around the support shaft 4c including.

Furthermore, the front block 5 is the press-fitting head 4.
The sliding grooves 5b each having a wedge-shaped cross section are formed over the entire length in the vertical direction on the left and right ends of the press-fitting head 2 when viewed from the front side. Insert the protruding slider 2k and connect it vertically slidably. An elevating cylinder 6 is arranged at the center of the front end of the front block 5 such that its rod 6a faces downward and its posture is aligned with the incision direction of the sliding groove 5b. The lower end of this rod 6a is connected to the press-fitting head 2. To do.

In the above construction, the hollow casing 50
The press-fitting of the traveling carriage 1 is performed by restraining the hollow casing 50 around the hollow casing 50 by the band 2c of the press-fitting head 2 and rotating the hollow casing 50 together with the band 2c by the drive motor 2f, similarly to the conventional full-circle turning excavator. It is carried out by press-fitting into the ground by utilizing its own weight 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 in a vertical posture. Therefore, the band 2c of the press-fitting head 2 is required.
Must always be in a horizontal position. By using the movement of the shifter 3 to set the posture of the press-fitting head 2 as described above, the axis line of the hollow casing 50 held by the band 2c can be changed no matter how the posture of the traveling carriage 1 changes. The vertical position can be set at all times.

That is, the base 4 of the shifter 3 has the pin 4b.
Since it is connected to the traveling carriage 1 by, the front end side of the front block 5 in FIG. 1, which is connected to the press-fitting head 5, can be swung in the vertical direction. 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 traveling surface of the crawler belt 1a, and the front carriage 5 can be moved relative to the traveling carriage 1. It can also be set in a twisted position.

By the movement of the shifter 3 as described above, FIG.
As shown in, for example, even when the ground on which the crawler belt 1a of the traveling carriage 1 is mounted is sloping down to the right and the ground where the hollow casing 50 is driven is a horizontal surface,
By making the base 4 incline slightly downward as compared with FIG. 1, the front block 5 can be set horizontally with the driving ground. Then, even when the ground on which the crawler belt 1a is mounted is inclined in the direction orthogonal to the drawing, when the outriggers 2i of the press-fitting head 2 are landed, the front block 5 rotates around the support shaft 4c to change its posture. Change. Therefore, the attitude of the press-fitting head 2 can be set parallel to the driving ground regardless of the attitude of the traveling carriage 1.

With respect to the variation of the height of the driving ground with respect to the shifter 3, the lifting cylinder 6 is operated to change the level of the press-fitting head 2 and the height of the outrigger 2i is adjusted. It is possible to set the head 2 in an appropriate posture.

From the above, regardless of the inclination of the traveling carriage 1, the posture of the press-fitting head 2 is set to be horizontal with respect to the driving ground, and the hollow casing 50 which is vertically inserted is restrained by the band 2c. Therefore, the hollow casing 50 can always be placed in the correct posture. The change in the posture of the press-fitting head 2 is entirely due to the movement of the shifter 3, which is a combination of the vertical swing of the base 4 around the pin 4b and the tilting movement of the front block 5 around the support shaft 4c. The press-fitting head 2 can be easily set in a posture in which the press-fitting head 2 closely follows the ground, and an excessive load does not act on the connecting portion with the traveling carriage 1 or the like.

Further, since the reaction force acting when the hollow casing 50 is press-fitted is directly transmitted to the traveling carriage 1 via the shifter 3, the weight of the traveling carriage 1 itself can be used as a reaction force receiver. For this reason, the weight load that the reaction force weight 2j provided on the press-fitting head 2 should bear can be reduced, and the work load such as carrying in and loading the reaction force weight 2j can be reduced.

When the traveling carriage 1 is moved,
As shown in FIG. 6, if the press-fitting head 2 is lifted to the boom 1b side by the wire 7, the shifter 3 connected to the traveling carriage 1 side by the pin 4b can be bent upward like a joint. Traveling of the traveling carriage 1 becomes easy.

In the embodiment, the omnidirectional swivel type press-fitting head has been described, but the same applies to an oscillating type press-fitting head instead.

[0030]

According to the present invention, the posture is set by the shifter interposed between the traveling carriage and the press-fitting head so that the press-fitting head follows the placing ground of the hollow casing regardless of the posture of the traveling carriage. be able to. Therefore, even if the situation of the ground at the site is complicated, if the press-fitting head is placed on the horizontal surface only around the casting ground, the hollow casing can be reliably driven vertically. It becomes possible to excavate a good shaft.

If the press-fitting reaction force is transmitted to the traveling carriage side via the shifter, the weight of the traveling carriage can be utilized as a reaction force receiver, and the number of reaction weights loaded on the press-fitting head can be utilized. Since less work is required, the work load is also reduced.

[Brief description of drawings]

FIG. 1 is a right side view showing an outline of a shaft excavating device of the present invention.

FIG. 2 is a cutaway plan view of essential parts showing a connecting structure of a press-fitting head to a traveling carriage.

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

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

FIG. 5 is a right side view showing the setting of the position of the press-fitting head on the driving surface when the traveling carriage is located on the slope to the right.

FIG. 6 is a right side view showing a state in which the press-fitting head is lifted by the wire for moving the traveling carriage.

FIG. 7 is a diagram showing shaft excavation by a conventional shaft excavator.

[Explanation of symbols]

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

Claims (2)

(57) [Claims] 1. A vertical shaft excavating device for connecting a press-fitting head for press-fitting a hollow casing all the way to the ground by swinging or swinging to a traveling carriage, the base end of which is connected to the traveling carriage, and the tip side thereof is vertically moved. A vertical shaft excavating device in which the traveling carriage and the press-fitting head are connected to each other through a shifter that can be swung to and swivel around the traveling axis of the traveling carriage. 2. The shifter is rotatable about a base whose base end is connected to a front surface of a traveling carriage by a pin having a horizontal axis and a spindle provided on the base and arranged in an axis line orthogonal to the axis line of the pin. Equipped with a front block connected to
The shaft excavating device according to claim 1, wherein the press-fitting head can be moved up and down at the tip of the front block through an elevating cylinder.