JP2014101207A - Suspension type glove bucket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suspension type glove bucket capable of efficiently excavating sediment, by eliminating the problem by that the opening-closing direction of the glove bucket is one-way.SOLUTION: A suspension type glove bucket comprises: a sheave 1 for suspending a wire suspended from the boom tip of a shaft excavator; a suspension frame 2 for rotatably installing this sheave 1; a shell installing frame 4 rotatably installed around a shaft in the vertical direction to this suspension frame 2 by a turning bearing 3; a support plate 5 having an upper part fixed to this shell installing frame 4; shells 7 and 8 having a base end joined to a support shaft 6 provided on the lower end of the support plate 5 and openable-closable around the support shaft 6; and opening-closing cylinders 9 and 10 having a base end part rotatably fixed to the shell installing frame 4, having a tip part joined to the shells 7 and 8, and opening-closing the shells 7 and 8.

Description

  The present invention relates to a hanging grab bucket used for shaft construction such as sewerage work, underground structure construction work, well excavation work, and cast-in-place pile work.

  A rocking or swiveling vertical shaft excavator that press-fits a steel circular casing while rocking or swiveling, excavating the sediment inside the steel circular casing, and placing bottom concrete to construct the shaft. Construction method is used. In this case, a suspended grab bucket is generally used to excavate the earth and sand inside the steel circular casing.

  For example, Patent Literature 1 discloses a shell mounting frame suspended from a work machine main body, a plurality of shells whose base ends are coupled by fulcrums and openable and closable around the fulcrum, and a base end on the shell mounting frame. In a grab bucket having a plurality of open / close cylinders for opening and closing the plurality of shells with a tip portion fixed to the plurality of shells and having a tip portion coupled to the plurality of shells, the tip portion is rotatably coupled to the shell. Further, a grab bucket is disclosed in which a link member whose base end portion is rotatably coupled to the shell mounting frame is provided for each shell. The grab bucket is configured to be able to shorten the overall length in the vertical direction of the grab bucket with the shell closed.

  Further, Patent Document 2 discloses a dolly that can travel, a boom that is connected to the dolly so as to be tiltable, and that supports an excavator via a wire. A casing tube that is incorporated in the front part of the dolly is clamped and shaken. In the shaft excavating apparatus provided with the rocking press-fitting mechanism for moving and press-fitting, the shaft excavating apparatus in which the rocking press-fitting mechanism is formed so as to be capable of being reduced is described. When using it, lower the grab bucket and feed it into the casing, expand the clamp inside the casing to fix the grab bucket, drill the earth and sand inside the casing with the bucket, loosen the clamp and lift the grab bucket The shaft is constructed by repeating the operation of earth removal.

JP 2012-20869 A JP-A-6-2482

  When the conventional grab bucket disclosed in the above-mentioned Patent Document 1 and Patent Document 2 is suspended in a shaft, the opening and closing direction is determined by the direction of the sheave that suspends the grab bucket and suspends the wire that moves up and down. . Usually, a sheave is installed in parallel with the boom, and for this reason, the opening / closing direction of the grab bucket is determined by the direction of the boom.

  For example, when opening and closing two shells, the grab bucket can excavate soil in the opening and closing direction, but cannot excavate soil in the perpendicular direction. Therefore, earth and sand remain, and the press-fit efficiency of the casing is lowered, or earth and sand remain on the inner wall of the casing.

  Therefore, an object of the present invention is to provide a suspended grab bucket that can solve the problem caused by the opening and closing direction of the grab bucket being one direction and can efficiently excavate earth and sand.

In order to solve the above-described problems, a hanging type grab bucket according to the present invention includes a hanging frame that is suspended by a wire, a shell mounting frame that is attached to the hanging frame, and respective base ends that are coupled by fulcrums. A plurality of shells openable and closable around the fulcrum, and a plurality of opening and closing members whose base end portions are pivotally fixed to the shell mounting frame and whose distal end portions are coupled to the plurality of shells to open and close the plurality of shells. In the hanging type grab bucket provided with the cylinder for use, the shell mounting frame is configured to be rotatable around a vertical axis by a rotating means with respect to the hanging frame. .
This configuration allows excavation in any direction by changing the opening and closing direction of the grab bucket from the outside, so there is no leftover of sediment inside the circular casing during shaft excavation, etc., and efficient sediment excavation is performed. Can do.

The pivoting means includes a pivot bearing that rotatably couples the suspension frame and the shell mounting frame, and a pivot mechanism provided between the suspension frame and the shell mounting frame. This configuration can be easily implemented.
The rotating mechanism has a rotating cylinder with one end attached to the hanging frame and the other end attached to the shell mounting frame, so that the rotating cylinder can be expanded and contracted, and the shell mounting frame can be expanded with respect to the hanging frame. Rotates and can open and close the shell in any direction.

  According to the present invention, since the plurality of shells are configured to be rotatable around the vertical axis by the rotating means with respect to the shell mounting frame, the opening / closing direction of the grab bucket can be arbitrarily changed. For this reason, for example, there is no digging of the earth and sand inside the circular casing at the time of excavation of shafts, etc., the peripheral friction between the circular casing and the earth and sand is reduced, and the press-fitting efficiency of the circular casing is increased. Moreover, since the amount of earth and sand adhering to the inside of the circular casing is reduced, the so-called debris dropping operation of scraping the earth and sand inside the circular casing is simplified.

The external shape of the normal state of the hanging type grab bucket which concerns on embodiment of this invention is shown, (a) is a side view, (b) is a top view. The external shape of the 90 degree rotation state of the hanging type grab bucket which concerns on embodiment of this invention is shown, (a) is a side view, (b) is a top view. It is a side view of the state which opened the shell in the hanging type grab bucket which concerns on embodiment of this invention. It is a partial notch enlarged view of the rotation mechanism in the hanging type grab bucket which concerns on embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS The shaft excavation state using the hanging type grab bucket which concerns on embodiment of this invention is shown, (a) is a whole side view, (b) discharges the earth and sand excavated with the grab bucket to the loading platform of a dump truck. (C) is the partial side view of the state which is excavating by rotating the grab bucket.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
A suspended grab bucket (hereinafter, simply referred to as “grab bucket”) A according to an embodiment of the present invention is suspended from a boom tip of a shaft excavator as shown in FIGS. A sheave 1 that suspends the wire to be suspended, a suspension frame 2 that is rotatably attached to the sheave 1, and a pivot bearing 3 that allows the suspension frame 2 to rotate about a vertical axis. The base end is coupled to the shell mounting frame 4 installed at the top, the support plate 5 whose top is fixed to the shell mounting frame 4, and the support shaft 6 provided at the lower end of the support plate 5. A plurality of (in this example, a pair of) shells 7 and 8 that can be opened and closed around, and a base end portion that is pivotally fixed to the shell mounting frame 4, and a distal end portion that is coupled to the shells 7 and 8. Open / close switch for opening and closing 8 And a Sunda 9 and 10.

  As described above, the shell mounting frame 4 is installed so as to be rotatable with respect to the suspension frame 2 by the swing bearing 3, and can be rotated to an arbitrary angle, in particular, a rotation position of 90 degrees by the rotation cylinder 11. It is like that.

  A roller 12 is rotatably provided on the outer periphery of the shell mounting frame 4 in order to prevent the main suspension type grab bucket from colliding with the inner wall of the circular casing and applying an impact during excavation work in the circular casing. It has been.

An example of constructing a shaft using the grab bucket A having the above configuration will be described with reference to FIG.
In FIG. 5, the shaft excavator 20 used for the shaft construction includes a base machine 21 that can travel, and a boom 22 that can be swung, expanded, and raised from the base machine 21. The grab bucket A is suspended by the wire 23. A circular shaft excavator 30 is fixed to the base machine 21 by a connecting device 24. The circular shaft excavator 30 includes a base frame 31 and an elevating frame 32, and the elevating frame 32 is driven up and down with respect to the base frame 31 by an elevating cylinder 33 serving as an elevating means. A grip band 34 that grips the outer periphery of the steel circular casing 40 is provided inside the lift frame 32, and is configured to rotate or swing with respect to the lift frame 32 by a hydraulic motor 35.

  An excavating blade 41 is provided at the lower end of the circular casing 40, and the lifting cylinder 33 is rotated or rocked by the hydraulic motor 35 while the upper outer periphery of the circular casing 40 is held by the holding band 34. The shaft will be excavated by driving. The circular casing 40 excavates a shaft having a predetermined depth while changing the gripping position by the gripping band 34 and adding the upper part of the circular casing 40.

  The earth and sand inside the circular casing 40 is grabbed and lifted using the grab bucket A, and discharged to the loading platform of the external dump truck 50 as shown in FIG. In the present invention, when the earth and sand in the circular casing 40 is gripped by the grab bucket A, the angle of the shells 7 and 8 with respect to the central axis is rotated by 90 degrees as shown in FIG. There is no digging of earth and sand, the friction around the circular casing 40 and the earth and sand is reduced, and the press-fitting efficiency of the circular casing 40 is increased.

  The present invention eliminates the problems caused by the opening and closing direction of the grab bucket in one direction, and as a suspended grab bucket capable of efficiently excavating earth and sand, sewer work, underground structure construction work, well excavation It can be suitably used for construction of shafts such as construction and cast-in-place pile construction.

A Hanging grab bucket (grab bucket)
DESCRIPTION OF SYMBOLS 1 Sheave 2 Suspension frame 3 Slewing bearing 4 Shell mounting frame 5 Support plate 6 Support shaft 7,8 Shell 9,10 Opening / closing cylinder 11 Rotating cylinder 12 Roller 20 Shaft excavator 21 Base machine 22 Boom 23 Wire 24 Connecting device 30 Circular shaft excavator 31 Base frame 32 Elevating frame 33 Elevating cylinder 34 Grip band 35 Hydraulic motor 40 Circular casing 41 Drilling blade 50 Dump truck

Claims (3)

A suspension frame suspended by a wire; a shell attachment frame attached to the suspension frame; a plurality of shells whose base ends are coupled by fulcrums and openable and closable around the fulcrum; and the shell attachment frame A hanging grab bucket having a base end portion rotatably fixed thereto and a distal end portion coupled to the plurality of shells to open and close the plurality of shells.
A suspended grab bucket, wherein the shell mounting frame is configured to be rotatable about a vertical axis by a rotating means with respect to the suspended frame.   The pivoting means includes a pivot bearing that rotatably couples the suspension frame and the shell mounting frame, and a pivot mechanism provided between the suspension frame and the shell mounting frame. The suspended grab bucket according to claim 1.   The suspension type grab bucket according to claim 2, wherein the rotation mechanism is a rotation cylinder having one end attached to the suspension frame and the other end attached to the shell attachment frame.

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