JPH0258689A - Excavator - Google Patents

Abstract

PURPOSE:To reduce working labor and time by extending a main auger shaft from the lower end of a casing tube vertically installed, and at the lower end thereof, by horizontally projecting an auxiliary excavating part so as to provide auxiliary auger shafts vertically, so that they can be turnedly driven by a rotation transmission mechanism. CONSTITUTION:A main auger shaft 5 which is turnedly driven by a turning shaft 4 is extended downward from the lower and of a casing tube 3 which has been vertically installed so as to cover the turning shaft 4 of a driving device 2. Further, an auxiliary excavating part 6 is projected nearly horizontally to the lower end of this casing tube 3. And auxiliary auger shafts 7 are provided vertically from the undersurface on the projected side, so that the rotation of the turning shaft 4 can be transmitted to them by a rotation transmission mechanism 8, consequently auxiliary auger shafts 7 together with the main auger shaft 6 can be turnedly driven by the drive of the driving device 2 via the turning shaft 4. Thus, oven the ground under an obstacle can be deeply excavated at one time by means of auxiliary auger shafts 7.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to an excavator, and more specifically, to an excavator whose upper part is covered by an obstacle such as a pedestrian bridge, the eaves of a building, or an overhang structure during foundation work. The present invention relates to an excavator suitable for excavating the ground at a location.

[Prior art and its problems] In a conventional excavator, a drive device is attached to a leader that is vertically supported to the ground by a crawler crane or the like so that it can be raised and lowered. The auger shaft is rotated by a drive device via a rotary shaft inserted into a gauging pipe suspended from the gauging pipe, and the ground is excavated by the excavation head at the lower end of the auger shaft.

In this type of excavator, the height of the leader etc. is high because it is necessary to dig deep into the ground, so the area above the ground where the excavation point is located is close to pedestrian bridges, eaves of buildings, overhang structures, etc. if it is covered by an obstacle,
It is not possible to set up a leader or the like at the excavation site, and it has been impossible for such conventional excavators to excavate under the above-mentioned obstacles.

Therefore, when excavating the ground under such obstacles such as pedestrian bridges, a low-profile excavator as shown in FIG. 3 has been used.

This low-profile excavator assembles a turret (40) of an appropriate height under an obstacle (29) located above the ground, such as a pedestrian bridge, and a small league (4) of this turret (40). ) is driven by a drive device (42) attached to the drive device (42) so as to be able to rise and fall freely, and an auger shaft (4) extending downward from this drive device (42) is driven.
3) was excavating the ground.

Here, the length of the auger shaft (43) extending downward from the drive device (42) needs to be smaller than the height of the space under the obstacles (two), so one auger shaft (4
3) The length is short, for example several meters, and with one such short auger shaft (43), 1
It was not possible to dig a deep hole above 0 meters.

For this reason, in the past, the short auger shaft (43
) After excavating the ground, as shown in Figure 3, the auger shaft (43) and drive device (42) are separated,
The relay shaft (4) is located between the auger shaft (43) and the drive device (42).
4), the auger shaft (43) is extended, and the extended auger shaft (43) is used to excavate a deeper hole, and this operation is repeated to extend the auger shaft (43). The holes were extended one after another to drill a desired deep hole.

However, with such a low-profile excavator,
Each time a hole with a depth corresponding to the length of one auger shaft (43) is dug, the auger shaft (43) and the drive device (42) are separated once, and the auger shaft (43) that is not separated is removed. It is necessary to connect the relay shaft (44) on top of the auger shaft (43) to extend the length of the auger shaft (43), and then connect the upper end of the connected relay shaft (44) to the drive device (42) again. In order to dig a
3), the reverse work had to be repeated many times, resulting in extremely poor work efficiency.

Moreover, since the auger shaft (43) is extended by connecting the relay shafts (44) one after another, the auger shaft (43) is
) etc., which causes problems in terms of durability, and it is also difficult to perform straight excavation with such an auger shaft (43).

[Problem to be solved by the invention] In this way, in the past, it has been difficult to efficiently excavate a deep hole in the ground in a place where the upper part is covered by obstacles such as a pedestrian bridge or an overhang structure of a building. There were no excavators capable of carrying out the excavation work.

This invention was made in view of the above circumstances, and an object of the invention is to provide an excavator that can efficiently perform excavation work even in places covered by obstacles such as pedestrian bridges. It is said that

[Means for solving the problem] In the excavator according to this invention, the leader (
A casing pipe (3) is suspended from a drive device (2) that moves up and down along The main auger shaft (5) to be driven extends downward from the lower end of the casing pipe (3), and is made to protrude substantially horizontally from the lower end of the casing pipe (3) to the auxiliary excavator ( 6).

Then, the auxiliary auger shaft (7) is suspended from the lower surface of the protruding side of the auxiliary excavation part (6), and the auxiliary auger shaft (7) is
The rotation of the rotation shaft (4) is transmitted by a rotation transmission mechanism (8), and by driving the drive device 2),
The auxiliary auger shaft (7) is driven to rotate together with the main auger shaft (5) via the rotating shaft (4).

[Function] In the excavator of the present invention configured as described above,
When the drive device (2) that moves up and down along the leader (1) is driven, the rotation shaft <4> provided in the hanging casing pipe (3) is rotated by this drive device (2), and this rotation As the shaft (4) rotates, the main auger shaft (5), which extends downward from the lower end of the casing pipe (3), rotates and protrudes substantially horizontally from the lower end of the casing pipe (3). The rotation of the rotation shaft (4>) is also transmitted by the rotation transmission mechanism (8) to the auxiliary auger shaft (7) hanging from the lower surface of the auxiliary excavation part (6), and the auxiliary auger shaft (7) rotates. It is supposed to be done.

This excavator can then be used to remove obstacles such as pedestrian bridges (29
), the auxiliary excavation part (6) protruding approximately horizontally from the lower end of the casing pipe (3) should be placed horizontally under an obstacle (29) such as a pedestrian bridge. Insert the reader (1) so that it stands next to the obstacle (29).

Then, in this state, the drive device (2) is driven, and while rotating the auxiliary auger shaft (7) together with the main auger shaft (5) via the rotation shaft (4), the drive device (2) is connected to the leader ( 1), and as the main auger shaft (5) excavates, the auxiliary auger shaft (7) excavates the ground under an obstacle (29) such as a pedestrian bridge.

[Example] Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

In the excavator according to the embodiment shown in FIG.
1) is held vertically at the front of a crawler crane (8), and the leader (1) is set in an appropriate position by this crawler crane (8). Of course, it is also possible to hold the leader (1) by a truck crane or the like other than the crawler crane (8).

A drive device (2) is slidably attached to the front surface of the leader (1) so as to hold the guide rail (9) provided on the front surface of the leader (1). The wire loaf handle 11) suspended from the hanging part (10) is suspended by a movable pulley (12) provided on the top surface of this drive bag W (2), and the drive device (2) is suspended from the hanging part (10). 10).

Then, the wire rope (11) is attached to the hanging portion (1
Fixed pulley (13) and guide roller (1) provided on
4), through (14), the wire rope (11) is wound around an electric winch, etc. mounted on the crawler crane (8), and this wire rope (11) is wound around the electric winch, etc. to drive the drive device (2).
is raised along the leader (1), while on the other hand, the wire rope (11) is sent out and the drive device (2) is raised along the leader (1).
1).

Further, a long hollow casing tube (3) is suspended from the lower surface of the drive device (2), and this casing tube (3) is attached to a steady rest (3) fixed to the lower end of the leader (1). 15), and the drive device (2) is held by the leader (
1), the casing tube (3) moves straight downward along the leader (1) without rattling.

Inside this casing pipe (3) is a rotating shaft (4).
is inserted, and this rotating shaft <4) is connected to the drive device (
2) is rotatably driven by a drive motor (not shown) provided inside.

In addition, the main auger shaft (5) is connected from the lower end of the casing pipe (3).
) extends downward, and this main auger shaft (5) is directly connected to the rotating shaft (4) and is rotationally driven by the rotation of the rotating shaft (4).

Furthermore, from the lower end of this casing pipe (3), an auxiliary excavation section (
6) is provided in a protruding manner, and this auxiliary excavation part (6) is firmly attached to the casing pipe (3) by a reinforcing diagonal member (20).

Further, a rotation transmission box (16) is provided below this auxiliary excavation part (6).
6) From the bottom, there are three long and short auxiliary auger shafts (7a),
(7b), (7c) are extended downward, and these three auxiliary auger shafts (7a), <7b), (7c) are arranged in the front-back direction and extend from the casing pipe (3). It is lined up in a line in the front-rear direction with the main auger shaft (5).

In this embodiment, as shown in FIG. 2, the main auger shaft (5) and the three auxiliary auger shafts (7a), (7
b), (7c) are arranged in alternating long and short directions, and the main auger shaft (5) and the three auxiliary auger shafts (
When rotating each drilling head (18) provided at the tip of 7a), <7b), and (7c) to drill a plurality of consecutive holes, the drilling heads (18) are prevented from colliding with each other. ing.

Furthermore, these main auger shafts (5) and auxiliary auger shafts (
7a), (7b), and (7c) are each provided with stirring blades (19) that protrude in the radial direction, and the stirring blades (19) are rotated to improve soil with excavated earth and sand and spouted cement milk, etc. The mixture should be stirred.

Further, from both sides of the upper surface of the rotation transmission box (16), there are two agitating shafts connected by the auxiliary auger shafts (7a), (7c) on both sides and the second driven shafts (28a>, (28b)). The shafts (17a) and (17b) each protrude upward.

Both stirring shafts (17a>, (17b)) are also provided with stirring blades (19) for stirring the excavated earth and sand and a soil conditioner such as cement milk, and furthermore, each stirring shaft (17a) , (17b) are provided with heads (31a) and (31b> for stirring and pulling,
These stirring shafts (17a) and (17b) rotate,
The excavated earth and sand and a soil conditioner such as cement milk are further stirred, and when the excavated earth and sand are pulled up, the earth and sand that has accumulated above is removed downward.

In addition, the auxiliary excavation part (6) and the rotation transmission box (16)
The rotation of the rotating shaft (4) is controlled by the above-mentioned auxiliary auger shafts (7a), (7b), (7c) and stirring shafts (1, 7).
There is a built-in rotation transmitter 1 (8) for transmitting data to a) (17b).

In this embodiment, as shown in FIG. 2, this rotation transmission mechanism (8) is directly connected to the rotation shaft (4) and the central auxiliary auger shaft (7b) in the auxiliary excavation section (6). The first driven shaft (24) and the sprocket (2
1), (21> is provided, and to this sprocket 1 (21)
The rotation of the rotating shaft (4) is transmitted to the first driven shaft (24) by the chain (22) wound between , (2+,),
The central auxiliary auger shaft (7b) is rotated in the same direction as the rotating shaft (4), that is, in the same direction as the main auger shaft (5).

Further, the rotation of the first driven shaft (24) is transmitted through the gear machine 1 (23) provided in the rotation transmission box (16) to intermediate gears provided on both sides of the first driven shaft (24). shaft(
25), (25), and these intermediate shafts (25),
(25) is rotated in the opposite direction to the rotating shaft (4), and further,
It is wound between the sprockets (26), (26) provided on these intermediate shafts (25>, (25)) and the respective second driven shafts (28a), (28b) located outside thereof. These intermediate shafts (25) are connected by chains (27).
, (25) are rotated by the second driven shafts (28a) and (2).
8b), which causes the auxiliary auger shafts (7a
), (7c) and stirring shafts (17a), (17b) are rotated in the opposite direction to the rotating shaft (4), that is, in the opposite direction to the main auger shaft (5).

As a result, the main auger shaft (5) and each auxiliary auger shaft (7a)
, (7b), and (7c) are bent in the direction in which they are arranged and alternately rotate in opposite directions.

Note that the rotation transmission mechanism (8) is shown as an example, and is not limited to the mechanism shown in the drawings, and the design can be changed as appropriate.

In addition, in this example, the casing pipe (3
), a soil conditioner such as cement milk is supplied to the main auger shaft (5) through the rotary shaft (4) inserted into the main auger shaft (5), and the bypass pipe (30
) to the auxiliary excavation part (6), and the first driven shaft (24
) to the central auxiliary auger shaft (7b).

Next, a case will be described in which excavation work is performed under an obstacle (29) such as a pedestrian bridge, as shown in FIG. 1, using the excavator as described above.

In this case, the excavator is moved by a crawler crane (8), and the auxiliary excavator (6) and rotation transmission box (16) protruding forward from the casing pipe (3) are moved.
The league (1) is erected next to the obstacle (29) by inserting the part under the obstacle (29) from the side.

Then, in this state, the drive device (2) is driven, and the main auger shaft (5), each auxiliary auger shaft (7a>, <7b), (7c), and each stirring Axis (1
7a>, (17b), lower the drive device (2) along the leader (1), and lower the main auger shaft (
5) and each auxiliary auger shaft (7a), (7b), (7
c) The ground is excavated by each excavation head (18) provided at the tip of the excavation head (18), and a soil conditioner such as cement milk is ejected from the elongated main auger shaft (5) and the central auxiliary auger shaft (7b). I try to do that.

Then, the excavated earth and sand and a soil conditioner such as cement milk are stirred with each of the excavation heads (18), and
Each auger shaft (5), (7a), (7b), (7c
) and stirring blades (19) provided on each stirring shaft (17a), (17b), and further each stirring shaft (17a), (1
7b) for agitation and lifting head (31
a) and (31b) to excavate to a desired depth.

In addition, during pulling up, each auger shaft (5), <7a>, (7b), (7c) is driven by the drive device (2).
) and the stirring shafts (1, 7a), (17b) in the opposite direction to the direction used during excavation, while rotating the drive device (2) to the leader (
1) and each stirring shaft (17a), (1, 7
b) A stirring and lifting head installed at the tip of the
31a) and (31b), the improved soil above which is a mixture of excavated earth and sand and a soil conditioner such as cement milk is removed downward, and furthermore, each stirring blade (
19) etc., this improved soil is stirred.

As a result, a soil-cement wall with a more uniform mix of excavated earth and sand and soil conditioners such as cement milk,
It will be constructed under obstacles (29) such as pedestrian bridges.

In addition, if the obstacle (29) such as a pedestrian bridge is wide,
After excavating from one side of the obstacle (29) as described above, move the crawler crane (8) to the opposite side of the obstacle (29), and excavate the obstacle (29) in the same manner as above.
), so that excavation is performed continuously across the entire width of the obstacle (29).

In addition, in the above embodiment, the main auger shaft (5) is
As explained in the book, multiple main auger shafts (5)
It is possible to install the auxiliary auger shaft (7) orthogonally to the rotation transmission box (1).
6) The number of auxiliary auger shafts (7) hanging from the bottom is also 3.
The number of books is not limited to one, two, or four or more.

[Effects of the Invention] As detailed above, in the excavation device according to the present invention, when excavating the ground where there is an obstacle such as a pedestrian bridge above, the casing pipe protrudes approximately horizontally from the lower end. Insert the auxiliary excavation part from the side under an obstacle such as a pedestrian bridge, and stand the reader next to the obstacle.
Driving the drive device, the main auger shaft extending downward from the lower end of the casing pipe and the auxiliary auger shaft extending downward from the auxiliary excavation part are rotated through the rotating shaft, and the main auger shaft excavates. Accordingly, the ground beneath obstacles such as pedestrian bridges is excavated using the auxiliary auger shaft.

As a result, according to the excavator of the present invention, when excavating the ground below where there are obstacles such as pedestrian bridges, eaves, and overhang structures of buildings, it is possible to add an auger shaft as in the past. There is no need to repeat the troublesome work of removing and removing the added auger shaft over and over again. Compared to things,
It has become possible to significantly reduce work effort and work time.

In addition, in the excavator of the present invention, unlike conventional methods, the auger shaft is not extended by adding it, so there is no weakening of the strength at the connection part of the auger shaft, which improves durability and allows for straight cuts. Holes can now be made.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of the present invention, Fig. 2 is a partially cutaway side view showing a rotation transmission mechanism in an excavator of the same embodiment, and Fig. 3 is a schematic explanatory diagram of a conventional example. . Explanation of symbols (1)... League (2)... Drive device (
3)...Casing pipe (4)...Rotating shaft (5)
...Main auger shaft (6) ...Auxiliary excavation part (7)
... Auxiliary auger shaft (8) ... Rotation transmission mechanism patent applicant Michihiro Fukumoto 1 piece

Claims (1)

[Claims] 1) A casing pipe (3) is suspended from a drive device (2) that moves up and down along the leader (1) so as to cover a rotating shaft (4) rotated by this drive device (2), and 4), the main auger shaft (5) rotationally driven by the main auger shaft (5) extends downward from the lower end of the casing pipe (3) and projects approximately horizontally from the lower end of the casing pipe (3). An auxiliary excavation part (6) is provided, and an auxiliary auger shaft (7) is inserted from the lower surface of the protruding side of this auxiliary excavation part (6).
An excavator characterized in that an excavator is provided with a rotation transmission mechanism (8) for transmitting the rotation of the rotation shaft (4) to the auxiliary auger shaft (7).