JP6436820B2 - Wear gauge and inspection method - Google Patents

Description

  The present invention relates to a wear gauge and an inspection method, and more particularly, to a wear gauge for measuring a wear degree of a ball seat attached to a lower end of a backstay that supports a leader of a pile driver from the rear, and an inspection method using the wear gauge. .

  The three-point pile driver is configured to support the leader, which can be raised and lowered at the front of the base machine, with the left and right back stays from the rear, and the lower end of the back stay is connected to the outriggers of the base machine via the ball seat. Attached to the beam.

  It is necessary to periodically measure the wear degree of the ball seat so that the ball seat is worn and the back stay does not fall off the outrigger beam. In order to measure the wear degree of the ball seat, parts such as a leader and a back stay must be disassembled and assembled each time, and a method for facilitating disassembly and assembly has been devised (see, for example, Patent Document 1). .)

JP-A-6-299554

  However, even if the disassembly / assembly method of Patent Document 1 is used, the work burden is large in order to disassemble at each inspection. In addition, the pile driver may be operated for a long time depending on the construction site, and there is a demand for maintaining the state in which the leader is standing upright.

  Therefore, an object of the present invention is to provide a wear gauge capable of performing a primary inspection of the degree of wear while keeping the leader upright.

  In order to achieve the above object, the wear gauge according to the present invention is a wear gauge for measuring a wear degree of a ball seat attached to a lower end of a backstay that supports a leader of a pile driver from the rear, wherein the ball seat includes the backstay. A spherical portion formed at the lower end of the ball, a ball seat base having a ball receiving portion for rotatably supporting the spherical portion, and an annular ball seat for accommodating the spherical portion in the ball receiving portion The wear gauge is formed of a C-shaped large piece member placed on the ball seat cover and a small piece member that can be inserted into a gap portion of the large piece member. Yes.

  Further, the inspection method of the present invention is the above-described inspection method using the wear gauge, wherein the large piece member and the small piece member are pressed against the spherical portion in a push-and-run state in which the spherical portion is pressed against the ball receiving portion. When the amount of the small piece member with respect to the large piece member exceeds a preset length, or in a pulling state in which the spherical portion is pulled up from the ball receiving portion, the large piece member and the small piece member are It presses against a spherical part, and when the protrusion amount of the small piece member with respect to the said large piece member exceeds the length set beforehand, it is judged that an overhaul inspection is required.

  According to the wear gauge and the inspection method of the present invention, the detailed disassembly and inspection can be performed by measuring the amount of protrusion and protrusion of the small piece member inserted into the gap portion of the C-shaped large piece member with the reader standing. Therefore, it is possible to reliably avoid the danger of the leader collapsing due to falling off due to wear of the ball seat, and the work efficiency is extremely high.

It is the perspective view which showed the wear gauge which shows a ball seat and the 1st example of this invention. It is a partial cross section side view similarly. FIG. 2 is an explanatory view (a plan view and a sectional side view) showing a relationship between a wear gauge and a new ball seat showing a first embodiment of the present invention. It is explanatory drawing (a top view and a cross-sectional side view) which similarly shows the relationship in a hand-held state of a wear gauge and a worn ball seat. It is explanatory drawing (a top view and a cross-sectional side view) which similarly shows the relationship in a pulling state of a wear gauge and a worn ball seat. It is explanatory drawing (a top view and a cross-sectional side view) which shows the relationship between the wear gauge which shows the 2nd example of this invention, and a new ball seat. It is explanatory drawing (a top view and a cross-sectional side view) which similarly shows the relationship in a hand-held state of a wear gauge and a worn ball seat. It is explanatory drawing (a top view and a cross-sectional side view) which similarly shows the relationship in a pulling state of a wear gauge and a worn ball seat. It is a side view of a pile driver. It is a top view of a pile driver.

  9 and 10 show an example of a three-point pile driver using the wear gauge of the present invention. 1 to 5 show a first embodiment of the wear gauge of the present invention. The pile driving machine 1 is undulated by a base machine 4 composed of a lower traveling body 2 and an upper revolving body 3 pivotably provided on the lower traveling body 2, and a front bracket 4a at the front of the base machine 4. The reader 5 is provided, and two backstays 6 and 6 that support the reader 5 from behind are provided. In addition, a foldable gantry 7 is provided at the rear of the upper swing body 3. A first winch drum 10 in which a first wire rope 9 that is a lifting rope for the working device 8 is wound in order from the front in the center in the width direction of the upper swing body 3 between the leader 5 and the gantry 7; A second winch drum 13 wound with a second wire rope 12 that is an elevating rope for the lower guide 11, a third winch drum 15 wound with an auxiliary winding rope (third wire rope) 14, and for raising and lowering the leader A fourth winch drum 17 around which a hoisting rope (fourth wire rope) 16 is wound is disposed.

  The first wire rope 9 sent out from the first winch drum 10 is hung on the top sheave 18 and hangs down from the upper end of the leader 5, and suspends the work device 8 along the leader 5 so as to be able to be raised and lowered. The first wire rope 9 is unwound from the first winch drum 10 while the screw shaft 19 is rotationally driven by the working device 8, and the working device 8 is lowered to perform excavation work. Further, a lower guide 11 for securing the verticality of the screw shaft 19 is suspended by the second wire rope 12 so as to be movable up and down along the leader 5.

  Outrigger beams 20 and 20 projecting to the left and right are provided on the rear side portion of the upper swing body 3, and front jacks 21 and 21 are provided on the front side portion of the front bracket 4a. Outrigger jacks 22 and 22 and front jacks 21 and 21 respectively provided in 20 are extended to hold the base machine 4 horizontally.

  The back stay 6 has an upper end attached to an intermediate portion of the leader 5, a stay cylinder 30 at the lower portion, and a ball seat 31 at the lower end of the stay cylinder 30. The ball seat 31 includes a spherical portion 32 formed at the lower end of the stay cylinder 30, a ball seat base 34 having a ball receiving portion 33 that rotatably supports the spherical portion 32, and the spherical portion 32. It is comprised with the annular | circular shaped ball seat cover 35 for accommodating in.

  The ball seat base 34 is fixed to the upper surface of the outrigger beam 20. The ball seat cover 35 is formed of a pair of halves obtained by halving an annular plate material, and the inner peripheral side forms a spherical surface 35 a that is continuous with the spherical surface of the ball receiving portion 33. A plurality of bolt holes provided at equal intervals in the circumferential direction are formed in the periphery of the upper surface of the ball receiving portion 33 of the ball seat cover 35 and the ball seat base 34. After the spherical portion 32 is accommodated in the spherical receiving portion 33 of the spherical seat base 34, the half of the spherical seat cover 35 is installed so as to sandwich the upper portion of the spherical portion 32, and the spherical seat cover 35 is sphered by a plurality of bolts 36. It is fixed to the seat base 34.

  The wear gauge 40 is formed by a C-shaped large piece member 41 placed on the ball seat cover 35 and a small piece member 42 that can be inserted into a gap portion of the large piece member 41. The large piece member 41 and the small piece member 42 are formed by cutting one annular plate member, and have a larger diameter than the head of the bolt 36 at equal intervals in the circumferential direction so as to correspond to the plurality of bolts 36. A through hole 43 is provided. The cut surfaces of the large piece member 41 and the small piece member 42 are parallel to each other. That is, the opposing surfaces 44 and 44 forming the gap portion of the large piece member 41 and both end surfaces 45 and 45 of the small piece member 42 are parallel to each other. Further, since the annular plate member is cut, the curvature of the inner peripheral surface 41a of the large piece member 41 and the curvature of the inner peripheral surface 42a of the small piece member 42 are equal, and the curvature of the outer peripheral surface 41b of the large piece member 41 and the small piece member are the same. The curvature of the outer peripheral surface 42b of 42 is equal.

  When the ball seat 31 is new, there is no gap between the spherical portion 32 and the ball receiving portion 33 as shown in the lower part of FIG. In this state, when the large piece member 41 and the small piece member 42 are pressed against the spherical portion 32, the opposing surface 44 is such that the outer end of the end surface 45 of the small piece member 42 and the outer end of the opposing surface 44 substantially coincide with each other. Cut-out portions 46, 46 are formed on the outer peripheral portion.

  As the backstay 6 is used, the spherical portion of the ball seat 31 is worn, and a gap is generated between the spherical portion 32 and the ball receiving portion 33. An inspection method using the wear gauge 40 will be described with reference to FIGS. 4 and 5.

First, before using the wear gauge 40, the working device 8 is wound up about 50 cm from the ground and the brake is applied. Further, the front jack 21 and the outrigger jack 22 are brought into a grounded state. Next, the reader 5 is tilted backward by about 2 degrees, and the spherical portion 32 is pressed against the ball receiving portion 33 as shown in the lower part of FIG.

Then, the large piece member 41 is placed on the ball seat cover 35 so that the small piece member 42 can be inserted from the rear side of the pile driving machine 1, and the small piece member 42 is pressed against the spherical portion 32. The amount L of the small piece member 42 with respect to the large piece member 41, that is, the distance between the outer end portion of the facing surface 44 of the large piece member 41 and the outer end portion of the end face 45 of the small piece member 42 is measured.

  Further, when the large piece member 41 is placed 180 degrees on the ball seat cover 35 so that the small piece member 42 can be inserted from the front side of the pile driving machine 1, and the small piece member 42 is pressed against the spherical portion 32. The amount L of L is measured.

  If either one or both of the amounts L of the two measurements are set to a predetermined length, for example, the diameter of the spherical portion 32 is 138 mm, the average value of the amounts L exceeds 1.5 mm. In such a case, it is determined that detailed inspection is necessary after disassembling the reader 5 and the like.

  In addition, the reader 5 can be inspected in the same manner even when the leader 5 is tilted forward by about 2 degrees and the spherical portion 32 is pulled up from the ball receiving portion 33 as shown in the lower part of FIG.

Similarly to the check of the pushing state, the large piece member 41 is placed on the ball seat cover 35 so that the small piece member 42 can be inserted from the rear side of the pile driving machine 1, and the small piece member 42 is pushed to the spherical portion 32. Hit it. The protrusion amount M of the small piece member 42 with respect to the large piece member 41, that is, the distance between the outer end portion of the facing surface 44 of the large piece member 41 and the outer end portion of the end face 45 of the small piece member 42 is measured.

  Further, when the large piece member 41 is placed 180 degrees on the ball seat cover 35 so that the small piece member 42 can be inserted from the front side of the pile driving machine 1, and the small piece member 42 is pressed against the spherical portion 32. Measure the amount of protrusion M.

  When one or both of the protrusion amounts M of these two measurements are set to a predetermined length, for example, the diameter of the spherical portion 32 is 138 mm, the average value of the protrusion amounts M exceeds 3.5 mm. In such a case, it is determined that detailed inspection is necessary after disassembling the reader 5 and the like.

  6 to 8 show a second embodiment of the wear gauge of the present invention. In addition, in the following description, the same code | symbol is attached | subjected to the component same as the component of the pile driver shown to the said 1st example, and detailed description is abbreviate | omitted.

  While the outer peripheral surface 42b of the small piece member 42 of the first embodiment is formed on an arc, the outer peripheral surface 42c of the small piece member 42 'of the wear gauge 40 shown in this embodiment is formed in a straight line. . By forming in this way, the amount of entry L and the amount of protrusion M can be measured by the length of the outer peripheral surface 42 c protruding from the cut-off portion 46. It is also possible to determine at a glance whether or not the wear limit has been reached by coloring the end face 45.

DESCRIPTION OF SYMBOLS 1 ... Pile driver, 2 ... Lower traveling body, 3 ... Upper turning body, 4 ... Base machine, 4a ... Front bracket, 5 ... Leader, 6 ... Back stay, 7 ... Gantry, 8 ... Working device, 9 ... 1st Wire rope, 10 ... first winch drum, 11 ... lower guide, 12 ... second wire rope, 13 ... second winch drum, 14 ... auxiliary winding rope, 15 ... third winch drum, 16 ... hoisting rope, 17 ... first 4 winch drum, 18 ... top sheave, 19 ... screw shaft, 20 ... outrigger beam, 21 ... front jack, 22 ... outrigger jack, 30 ... stay cylinder, 31 ... ball seat, 32 ... spherical portion, 33 ... ball receiving portion, 34 ... Ball seat base, 35 ... Ball seat cover, 40 ... Wear gauge, 41 ... Large piece member, 42, 42 '... Small piece member, 41a, 42a ... Inner peripheral surface, 41b, 42 , 42c ... outer peripheral surface, 43 ... insertion holes, 44 ... facing surface 45 ... end surface, 46 ... cut off portion, L ... enter weight, M ... overhang

Claims (2)

In the wear gauge that measures the degree of wear of the ball seat attached to the lower end of the backstay that supports the leader of the pile driver from behind,
The ball seat is
A spherical portion formed at the lower end of the backstay;
A ball seat base having a ball receiving portion for rotatably supporting the spherical portion;
It is composed of an annular ball seat cover for storing the spherical portion in the ball receiving portion,
The wear gauge is formed of a C-shaped large piece member placed on a ball seat cover and a small piece member that can be inserted into a gap portion of the large piece member. In the inspection method using the wear gauge according to claim 1,
In the push-and-hold state in which the spherical portion is pressed against the ball receiving portion, the large piece member and the small piece member are pressed against the spherical portion, and the amount of the small piece member with respect to the large piece member exceeds a preset length. Or
In the pulling state in which the spherical portion is pulled up from the ball receiving portion, the large piece member and the small piece member are pressed against the spherical portion, and the protruding amount of the small piece member with respect to the large piece member exceeds a preset length. An inspection method characterized by determining that an overhaul is necessary.

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