JP3394205B2 - All casing excavator workbench - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a workbench of an all-casing excavator.

[0002]

2. Description of the Related Art An all-casing excavator is a machine for constructing large diameter cast-in-place piles. In order to prevent collapse of the earth and sand on the excavated surface, a steel casing tube is inserted while rocking or rotating, and a pile hole is excavated by a hammer club. After excavation, build a cage made of steel bars and pull out the casing tube while pouring concrete.

As shown in FIGS. 6 to 9, the all-casing excavator is provided with four lifting and lowering frames 14 (FIG. 8) on four circumferences of a base frame 13 which is horizontally held by four jack cylinders 12. A book thrust cylinder 15 is provided upright.

A ring-shaped lower rotating frame 16 (FIG. 7) is rotatably supported by a bearing 24 on the elevating frame 14, and a ring gear 17 is formed on the outer periphery of the lower rotating frame 16 and is attached to the ring gear 17. Outputs reduced by the two hydraulic motors 18 provided on the elevating frame 14 via the speed reducer 19 are meshed with each other via a pinion gear 21 and an idler gear 22 attached to the lower end of the output shaft 20. Idler gear 22 is idler shaft 2
It is rotatably supported around 3.

Returning to FIG. 6, reference numeral 1 is a chuck cylinder provided between the ends of the fixed band 4 and the movable bands 5 and 7.
This actuates the moving bands 5, 6, 7 to chuck the casing tube 11 (FIG. 6). The fixed band 4 and the three movable bands 5, 6 and 7 each have an arc shape, and the fixed band 4 and the movable bands 5 and 7 are connected by the chuck cylinder 1, but the movable bands 5 and 6 or the movable band 6 are connected to each other. 7 is pin-connected at the end. In order to supply pressure oil to the chuck cylinder 1,
The rotating side cylinder 2 is connected to the rotating body side, that is, the lower rotating frame 16
A plurality of (five in FIG. 6) are erected on the upper side, and the cylinder rods of the rotation side cylinder 2 are connected to the rotation side rotation frame 8 (FIG. 7),
A plurality of fixed-side cylinders 3 for pulling up via the bearing 9 and the fixed-side rotary frame 10 above the rotary-side rotary frame are erected on the elevating frame 14. The rotating frame 10 on the fixed side and the rotating frame 8 on the rotating side are relatively rotatable via a bearing 9. The rotary frame 8 on the rotary side is the rod end of the cylinder 2 on the rotary side, and the rotary frame 10 on the stationary side is the cylinder 3 on the fixed side.
Are connected to the rod ends via brackets.

The chuck portion opens and closes three moving bands 5, 6, 7 connected by expansion and contraction of the chuck cylinder 1 provided as a pair, and the moving bands 5, 6, 7 and the fixed band 4 form a casing. Chuck or open tube 11.

As shown in FIG. 5, when the ready-mixed concrete is carried in from the concrete mixer truck a, such a casing tube 11 is easier to work when the tube mouth (upper end of the tube 11) is buried lower. If the tube mouth is higher than the all-casing excavator as shown in Fig. 5,
It is very dangerous because it is necessary to raise the mixer truck a along the sloping platform b and raise the position of the mixer truck a to inject fresh mixed concrete. For this reason, it is common to embed the casing tube 11 to a position slightly higher than the upper end and the upper surface of the elevating frame.

Referring to FIG. 10 below, the actual fair 7-6231
The workbench of the known all-casing excavator disclosed in No. 1 will be briefly described. A work step 26 is provided on the outer side of the upper frame 25, and a ring-shaped footrest plate 27 is placed on the inner side thereof.

The footrest plate 27 is a casing tube 11
(The members common to those in the known examples shown in FIGS. 6 to 9 will be described with the same reference numerals.) A ring body whose inner diameter is formed according to the outer diameter is divided into two parts, and a U-shaped cross section. When mounting on the upper frame 25, the ribs of the footrest plate 27 formed in a U shape are formed on the outside of the head of the bolt 28 (FIG. 10 (b)) screwed to the upper frame 25. It is positioned by hooking the part. Thereby, the gap between the work step 26 and the casing tube 11 can be closed.

When the outer diameter of the casing tube 11 is different, the working step 26 is performed by replacing the casing tube 11 with a footrest plate 27 having an inner diameter corresponding to the outer diameter.
The gap between the casing tube 11 and the casing tube 11 can be closed. With such a configuration, a footrest plate 27 that serves as a workbench
Is provided on the upper surface of the upper frame 25, the end of the tube 11 is located at a considerably low position, and workability such as bolt tightening at the time of connecting the tube is extremely deteriorated.

[0011]

In the all-casing excavator as described above, when a casing tube 11 having a small diameter is used, a wide gap is created between the work space and the casing tube 11, which results in workability. Becomes worse. In addition, since the problem that mud enters the excavator main body through the gap, it is an object of the present invention to solve these problems and provide a workbench with better workability.

[0012]

In an all-casing excavator, a workbench 29 is provided on the rotating frame 8 side accompanied by rotation.
Installed. Further, the workbench 29 is divided into a plurality of pieces, and the downwardly facing claws 31 provided on the workbench side are attached to the rotary frame 8
Hole 31 formed in the bracket 30 provided on the inner surface of the
It was inserted in A and attached. Further, the workbench is divided into a plurality of pieces, and an insertion hole 32 is provided at the end of the workbench 29,
This is mounted by inserting it into the fixing claw 32A provided upward on the bracket 30 provided on the inner surface of the rotating frame 8 on the rotating side.

[0013]

DETAILED DESCRIPTION OF THE INVENTION A description will be given with reference to FIGS. FIG. 1 shows a mounting structure of a workbench 29 according to the present invention (since it appears symmetrically, only the left side of the center line is shown). In FIG. 1, a bracket 30 is provided inside the rotating frame 8 on the rotating side that rotates together with the casing tube 11 of the elevating frame 14, and the work table 29 is attached to this.

FIG. 2 shows an example of a mounting method of the workbench 29. This is provided with a downward claw 31 at the bottom of the workbench 29, and a bracket 30 attached to the rotating frame 8 on the rotating side.
It is a method of inserting from above into the hole portion 31A formed in.

FIG. 3 shows another mounting example of the workbench 29. In this case, the insertion hole 3 provided in the workbench 29 is shown.
2 is dropped into a claw 32A provided upward on a bracket 30 provided on the rotating frame 8 side.

FIG. 4 shows the casing tube 11 on the workbench.
It is the figure which compared the work attitude | position at the time of carrying out addition work etc. of a conventional type (left side of a figure). The height of the upper end of the casing tube 11 to be embedded is such that the workbench 29 is attached to the rotary frame 8 on the rotary side in the present invention as shown on the right side of the figure, so that the upper frame 25 of the conventional type (left side of FIG. 4) is used. The position is lower than that of the footrest plate 27 provided above, and it becomes unnecessary to bend the waist extremely as shown in FIG.

[0017]

According to the first aspect of the present invention, when a casing tube having a small diameter is used, a wide gap is created between the working space and the casing tube, but since the working table is provided on the rotating frame, the working table is located at a low position. As a result, workability was improved and mud did not enter the excavator body. Further, according to the second or third aspect of the invention, the workbench can be attached and detached very easily, which contributes greatly to the improvement of workability.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a mounting structure of a workbench of the present invention,
Only the left side of the center line is shown.

FIG. 2 is a diagram showing a first example of how to attach a workbench.

FIG. 3 is a diagram showing a second example of how to attach the work table.

FIG. 4 is a comparison diagram of a work posture on a workbench according to a conventional type and the present invention.

FIG. 5 is a view showing a conventional working state when pouring concrete.

FIG. 6 is a plan view of a main part of a known tubing device.

FIG. 7 is a side view of the same.

FIG. 8 is a plan view of a main part of the tubing apparatus.

FIG. 9 is a side view of the tubing apparatus.

FIG. 10 shows a workbench mounting structure in a known excavator, (a) is a partially sectional front view, (b) is an enlarged view of a main part of (a),
(c) is a plan view.

[Explanation of symbols]

1 Chuck Cylinder 2 Rotation Side Cylinder 3 Fixed Side Cylinder 4 Fixed Band 5,6,7 Moving Band 8 Upper Rotating Frame 9 (Rotating Side) Upper Rotating Frame 11 (Rolling Side) Upper Rotating Frame 11 Casing Tube 12 Jack Cylinder 13 Base Frame 14 Lifting frame 15 Thrust cylinder 16 Lower rotating frame 17 Ring gear 18 Hydraulic motor 19 Reducer 20 Output shaft 21 Pinion gear 22 Idler gear 23 Idler shaft 24 Bearing 25 Upper frame 26 Working step 27 Footrest plate 28 Bolt 29 Workbench 30 Bracket 31 Claw 31A hole 32 insertion hole 32A claw

Claims (3)

(57) [Claims] 1. A workbench of an all-casing excavator, characterized in that a workbench (29) is attached to a rotating frame (8) side accompanied with rotation in the all-casing excavator. 2. The workbench (29) is divided into a plurality of pieces, and the downward claw (31) provided on the workbench side is provided with a rotary frame on the rotation side.
Holes formed in the bracket (30) provided on the inner surface of (8)
The workbench of the all-casing excavator according to claim 1, wherein the workbench is inserted into the (31A) and attached. 3. The worktable is divided into a plurality of worktables, and the worktable (29)
Insert the insertion hole (32) at the end of this and insert it into the fixing claw (32A) provided upward on the bracket (30) provided on the inner surface of the rotating frame (8) on the rotating side. The workbench of the all-casing excavator according to claim 1.