JP6242250B2 - How to raise the boom - Google Patents

Description

  The present invention relates to a method for raising a boom, and more particularly, to a method for raising a boom of a construction machine using an extendable boom.

  A telescopic boom that supports a telescopic boom from below with a hoisting cylinder is widely used as a boom for various mobile cranes, and in recent years, it is also used as a boom for an earth drill (see, for example, Patent Document 1). ). In addition, as a method of raising and lowering the lattice boom of the crane, a pendant rope having one end connected to the tip of the boom, a hoisting rope connecting the other end of the pendant rope and a gantry provided at the rear of the base machine, and a hoisting rope In a crane equipped with a winch that winds up and down, a method of raising and lowering the boom by changing the length of the hoisting rope by winding and feeding the hoisting rope with the winch (for example, Patent Document 2).

JP 2009-46866 A JP 2009-40571 A

  When trying to apply the method described in Patent Document 2 to erect the boom of the earth drill using the telescopic boom described in Patent Document 1, the telescopic boom is moved by the telescopic cylinder while feeding the hoisting rope from the winch. It was necessary to work while stretching, and complicated work was required. In addition, in order to extend the telescopic boom that is hung in the horizontal direction, it was necessary to secure a work space for the extension of the boom.

  Therefore, an object of the present invention is to provide a stand-up method for standing up a boom of a construction machine using a telescopic boom without performing complicated work in a limited work space.

  In order to achieve the above object, the boom rising method according to the present invention includes an upper swing body that is turnably provided on an upper portion of a lower traveling body, and a base end that is provided to be raised and lowered at a front portion of the upper swing body A boom raising method for a construction machine comprising a telescopic boom and a gantry provided at the rear part of the upper swing body, wherein the construction machine has one end connected to at least the second and subsequent boom tips. A pendant rope, a middle sheave provided at the other end of the pendant rope, a gantry sheave provided at the upper end of the gantry, a hoisting rope wound between the gantry sheave and the middle sheave, and the hoisting rope A hoisting drum mounted on the rear part of the upper revolving structure for winding up the gantry sheave and the middle sheave when the boom is raised from a horizontal state. The undulation length of rope between the blanking remains constant, is characterized by erecting the telescopic boom by extending the telescopic boom.

  The boom raising method according to the present invention eliminates the need to feed the hoisting rope, and can raise the boom only by the work of extending the telescopic boom. Further, since the telescopic boom does not extend in the horizontal direction when the boom stands, it does not take up work space.

It is explanatory drawing which shows an example of the earth drill which implements the boom standing-up method of this invention (horizontal state). It is also explanatory drawing (intermediate state). It is also an explanatory view (standing state). It is a side view which shows a state.

  FIG. 1 thru | or FIG. 3 shows an example of the earth drill which implements the boom standing-up method of this invention. The base machine 12 in the earth drill 11 is provided with an upper swing body 15 rotatably on the upper portion of the lower traveling body 13 via a swing bearing 14. A telescopic boom 16 is provided at the front portion of the upper swing body 15 so that it can be raised and lowered, and a foldable gantry 17 is provided at the rear portion of the upper swing body 15. A main winding rope (not shown), which is an elevating rope for lifting a kelly bar (not shown), is wound around the central portion of the upper swing body 15 between the telescopic boom 16 and the gantry 17 in order from the front. An auxiliary winding drum 19 in which a main winding drum 18 and an auxiliary winding rope (not shown) are wound, and a hoisting drum 21 in which a hoisting rope 20 for boom hoisting described later is wound, are arranged. A counterweight 22 is mounted at the end. Further, a driver's seat 15a and an equipment room 15b are provided on the right side of the upper swing body 15, and an engine room (not shown) containing an engine and a hydraulic pump is provided on the left side.

  The telescopic boom 16 is a three-stage telescopic type having a box-shaped cross section, and a lower boom (a mounting bracket 23 provided at the base end portion is mounted to the boom bracket of the upper swing body 15 so as to be able to undulate via a foot pin ( Base boom) 16a, a second boom 16b inserted into the lower boom 16a in an extendable manner, and an upper boom 16c inserted into the second boom 16b in an extendable manner.

  Further, the telescopic boom 16 is provided with a first telescopic cylinder (not shown) for extending and retracting the second boom 16b relative to the lower boom 16a between the lower boom 16a and the second boom 16b. A second telescopic cylinder (not shown) is provided between the boom 16c and the upper boom 16c to expand and contract with respect to the second boom 16b.

  Furthermore, the tip of a pair of left and right pendant ropes 24 for raising and lowering the boom is attached to the tip of the second boom 16b. Further, a top sheave 25 around which a main rope for lifting and a supplementary rope are hung is provided at the tip of the upper boom 16c, and the lower boom 16a has a front for supporting a Keriba driving device (not shown). A frame 26 and a plurality of frame cylinders 27 are attached.

  A middle sheave 28 is provided at the other end of the pendant rope 24, one end of which is connected to the tip of the second boom 16 b, and a gantry sheave 29 is provided at the upper end of the gantry 17. The hoisting rope 20 is wound between the middle sheave 28 and the gantry sheave 29, and the hoisting rope 20 between the middle sheave 28 and the gantry sheave 29 is wound by the hoisting drum 21 and sent out. Can be changed.

  Next, the procedure of the boom raising method of the present invention will be described with reference to FIGS. When the earth drill 11 is transported, the telescopic boom 16 is shortened in the horizontal direction and the gantry 17 is also folded. As shown in FIG. 1, the earth drill 11 that has moved to a place where the telescopic boom 16 is desired to stand is first mounted with a counterweight 22 at the rear part of the upper swing body 15 to raise the gantry 17.

  In this state, the second boom 16b is extended with respect to the lower boom 16a by the first telescopic cylinder while keeping the length of the hoisting rope 20 between the middle sheave 28 and the gantry sheave 29 constant without operating the hoisting drum 21. Then, as shown in FIG. 2, the tension of the pendant rope 24 and the hoisting rope 20 and the force to extend the second boom 16b work, and the telescopic boom 16 rotates around the base end of the lower boom 16a. And begin to stand up.

  When the length of the hoisting rope 20 between the middle sheave 28 and the gantry sheave 29 is kept constant, when the second boom 16b is extended to the maximum with respect to the lower boom 16, as shown in FIG. It becomes. When the second boom 16b is fixed to the lower boom 16a by an arbitrary fixing means, a crane operation can be performed. Furthermore, a work as an earth drill can be performed by appropriately attaching a kelly bar driving device or the like from this state and extending the upper boom 16c.

  Thus, it is not necessary to operate the hoisting drum 21, and the telescopic boom 16 can be erected only by the extension work by the first telescopic cylinder. Moreover, since the second boom 16b does not extend with respect to the lower boom 16 in the horizontal direction, no work space is taken up.

In addition, the number of expansion / contraction steps in the telescopic boom is arbitrary, and the attachment position of the pendant rope may be provided at the tip of at least the second and subsequent steps other than the lower boom. Moreover, although implementation with an earth drill is described, it can be implemented with various construction machines such as a pile driver and a crane as long as the telescopic boom is used.

  DESCRIPTION OF SYMBOLS 11 ... Earth drill, 12 ... Base machine, 13 ... Lower traveling body, 14 ... Turning bearing, 15 ... Upper turning body, 15a ... Passenger seat, 15b ... Equipment room, 16 ... Telescopic boom, 16a ... Lower boom, 16b ... Second Boom, 16c ... Upper boom, 17 ... Gantry, 18 ... Main winding drum, 19 ... Supplementary winding drum, 20 ... Relief rope, 21 ... Relief drum, 22 ... Counterweight, 23 ... Mounting bracket, 24 ... Pendant rope, 25 ... Top sheave, 26 ... Front frame, 27 ... Frame cylinder, 28 ... Middle sheave, 29 ... Gantry sheave

Claims (1)

An upper swinging body provided on the upper portion of the lower traveling body, a telescopic boom having a proximal end capable of raising and lowering at a front portion of the upper swinging body, and a gantry provided at a rear portion of the upper swinging body; A boom standing method for a construction machine equipped with
The construction machine includes a pendant rope having one end connected to the tip of the boom at the second and subsequent stages, a middle sheave provided at the other end of the pendant rope, and a gantry sheave provided at the upper end of the gantry; A hoisting rope wound between the gantry sheave and the middle sheave, and a hoisting drum mounted on the rear part of the upper swing body for winding the hoisting rope,
When the boom is raised from a horizontal state, the telescopic boom is raised by extending the telescopic boom while keeping the length of the hoisting rope between the gantry sheave and the middle sheave constant. Boom standing method.

Images