JP3318270B2 - Leader mounting structure of pile driver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leader mounting structure for connecting a plurality of leaders used in a pile driver.

[0002]

2. Description of the Related Art A pile driver is equipped with a base machine such as a crawler crane, a winch for suspending a pile or a pile driver, and a leader for regulating the pile direction so that the pile can be driven at a predetermined angle. . The leader is equipped with a pile hammer, earth auger, etc., and is compatible with various types of pile driving.

Conventionally, this type of reader is configured as shown in FIG. That is, the reader 1 includes the reader main pipe 2 and the leader flanges 3 fixed to both ends of the reader main pipe 2. In each reader 1 having the same configuration, the flanges 3 are fastened by bolts 4 and nuts 5 and connected.

FIG. 1C is a partially broken longitudinal sectional view showing the connecting portion in an enlarged manner. The flange 3 has a donut shape and is fixed to the main pipe 2 by welding at two places A and B. Also, in order to secure the rigidity of the flange 3,
A reinforcing rib 6 is provided between the flange 3 and the outer periphery of the main pipe 2.
Are joined by welding. Each flange 3 has a bolt hole 7 into which a bolt 4 is inserted.

FIG. 1B is a sectional view taken along the line bb in FIG. 1A. The fastening of the flanges 3 by the bolts 4 and the nuts 5 is constant along the circumference of the flanges 3. It is done at intervals. In the figure, the illustration of the nuts 5 and the bolts 4 is partially omitted, and only the center positions thereof are shown at regular intervals. The reinforcing ribs 6 are also provided at regular intervals along the circumference of the flange 3.

[0006]

However, in the above-described conventional leader mounting structure, when the bolt 4 and the nut 5 are fastened, the head (or the nut 5) of the bolt 4 is turned with a tool. Another tool must be used to secure the opposite nut 5 (or bolt 4) so that it does not rotate. Since the bolt 4 and the nut 5 are large in size, conventionally, one worker turns the head (or the nut 5) of the bolt 4 with a tool such as a box wrench or an open-end wrench, and another worker stops the rotation. Therefore, the nut 5 (or the bolt 4) on the opposite side was fixed with a similar tool. For this reason, in the above-described conventional reader mounting portion structure, the fastening operation of the bolt 4 and the nut 5 requires 2
It required personnel and the work efficiency was not good.

[0007] In the above-mentioned conventional reader mounting portion structure,
The joining of the flange 3 and the main pipe 2 is performed by welding at two places A and B, and the joining of many reinforcing ribs 6 is also performed by welding. Therefore, the above-mentioned conventional leader mounting portion structure required many welding steps. Further, a large number of reinforcing ribs 6 were required, and the number of parts was large.

In addition, the leader 1 is warped due to the distortion due to welding, and a distortion removing operation is required to remove the warp. In the conventional leader mounting structure, it takes time to remove the distortion.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and a plurality of main pipes are fastened to each other by fixing bolts and nuts to flanges fixed to ends of the main pipe. In the leader mounting structure of the pile driver to be connected, the body outer diameter of one flange is smaller than the diameter obtained by subtracting the outer circumference turning radius of the fastener from the fastening center diameter of the bolt and nut, and the other flange is The body is characterized in that a detent portion having an outer diameter slightly smaller than a distance obtained by subtracting half of the two face widths of the bolt head or the nut from the fastening center diameter is formed.

In this structure, the outer diameter of the body of one flange is set to be small so that the fastener is rotated, and the body of the other flange is provided around the bolt head or the nut close to the nut. A stop portion is formed. For this reason, the nut or bolt head is turned using the fastener, and the opposite bolt head or nut hits the detent part formed on the body of the other flange, preventing it from rotating together. Is done.

[0011] The present invention also provides a leader mounting structure for a pile driving machine in which flanges fixed to ends of main pipes are fastened by bolts and nuts and a plurality of main pipes are connected. The outer diameter of the body is smaller than the diameter obtained by subtracting the outer circumference turning radius of the fastener from the center diameter of the bolt and nut, and the other flange has a groove to fit the bolt head or nut. It is characterized by being formed in a part.

In the present structure, the outer diameter of the body of one flange is set small so that the fastener is turned, and the body of the other flange is fitted with a bolt head or a nut. A groove is formed. For this reason, the nut or bolt head is turned using the fastener, and the opposite bolt head or nut hits the groove formed in the body of the other flange to prevent the nut or bolt from rotating together. .

Further, according to the present invention, in a leader mounting structure of a pile driving machine in which flanges fixed to ends of a main pipe are fastened by bolts and nuts and a plurality of main pipes are connected, each flange is A taper is formed at a peripheral end abutting on the main pipe, and the end of each main pipe is press-fitted along the taper and fixed to each flange.

According to this structure, the end of the main pipe is press-fitted along the taper, so that the shape of the peripheral end of the main pipe is corrected to a perfect circle, and the end of the main pipe and the flange are joined together. There is no gap between them, and the degree of adhesion of the connection part is increased. Therefore, the connection between the main pipe and the flange is completed by fixing at one place.

Further, the present invention is characterized in that the thickness of the body of each flange is greater than the thickness of the main pipe.

According to this structure, the rigidity of the flange is increased,
Conventional reinforcing ribs are no longer needed.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a structure for attaching a leader of a pile driver according to the present invention.

FIG. 2A shows a configuration in which the readers 11 are connected by the reader mounting portion structure according to the present embodiment.

Each reader 11 has a leader main pipe 12
And a left leader flange 13 and a right leader flange 14 fixed to both ends of the leader main pipe 12. In each of the readers 11 having a similar configuration, the right flange 14 of the reader 11 and the left flange 13 of the adjacent reader 11 are fastened and connected by bolts 15 and nuts 16.

FIG. 1B is a sectional view taken along line bb in FIG. 1A, and FIG. 1C is a sectional view taken along line cc in FIG. 1A. . Fastening between the flanges 14 and 13 by the nut 16 and the bolt 15
It is performed at regular intervals in the flange portions 14a and 13a of the collars 4 and 13. Each of these diagrams (b) and (c)
In the figure, the illustration of the nut 16 and the bolt 15 is partially omitted, and only the center positions thereof are shown at regular intervals. The hatched portions in each of these drawings (b) and (c) are the trunk portions 14 b and 13 b of the flanges 14 and 13.

FIG. 1A is a partially broken longitudinal sectional view showing an enlarged connection portion of each of the flanges 14 and 13, and FIG.
Is a cross-sectional view taken along the line b in FIG.
FIG. 2 is a sectional view taken along line c of FIG.

Each of the flanges 14 and 13 is provided with a flange 1
4a, 13a and body portions 14b, 13b. The outer diameter of the barrel portion 14a of the right flange 14 is [phi] D _1, the cylinder outer diameter [phi] D ₁ is a bolt 15 and fastening the central diameter [phi] D fastener outer circumferential dynamic radius _{R B} (FIG from _B of the nut 16 (b )) Is set smaller than the diameter (φD _B -2R _B ) obtained by subtracting). That is, for the right flange 14, a space of only turn contains tightening tool of the nut 16 is necessary, between the radius R _B and the body outer diameter [phi] D ₁ of the outer peripheral edge of the tightening tool is rotated Always has a gap of ΔR (see FIG. 4B). Note that φD ₀ is the diameter up to the outer peripheral end when the nut 16 rotates.

The outer diameter of the body 13b of the left flange 13 is also φD
_1, but in the body portion 13b, a distance obtained by subtracting the 2 surface width half B of the head of the bolt 15 from the fastening center diameter [phi] D _B (see FIG. _{(C)) (φD B -2} × B / only slightly smaller detent portion of the outer diameter [phi] D ₂ is formed than 2). In other words, half the width B of the two faces B of the head of the bolt 15 /
2, fastening central diameter [phi] D substantially equal to the distance obtained by subtracting the outer diameter [phi] D ₂ [Delta] L (see FIG. (C)) from _B, B / 2 from the relationship of parts machining tolerances and assembly tolerances only slightly smaller than [Delta] L (B / 2 <ΔL).

The inner diameter of each of the flanges 14 and 13 is φD
₃ and the thicknesses of the body portions 14b and 13b (D ₁ −
D ₃ ) / 2 is set to be thicker than the wall thickness t of the main pipe 12 ({(D ₁ −D ₃ ) / 2}> t). here,
The inner diameter of the main pipe 12 is [phi] D _P.

Each of the flanges 14 and 13 has a taper 14c,
3c are respectively formed. Each main pipe 12 is press-fitted at its end along the taper 14c, 13c, and then welded and fixed to each flange 14, 13 at a location A.

In the leader mounting portion structure according to the present embodiment, as described above, the outer diameter φD ₁ of the body portion 14 b of the right flange 14 is set small so that the fastener for tightening the nut 16 rotates. together are, in the body portion 13b of the left flange 13, detent portion of the outer diameter [phi] D ₂ proximate to the head of the bolt 15 is formed. For this reason, the nut 16 is turned using the fastener, and the head of the bolt 15 on the opposite side comes into contact with the detent portion formed on the body 13 b of the left flange 13.

As a result, when turning the nut 16, the bolt 1
5 are prevented from rotating together, and according to the leader mounting portion structure of the present embodiment, the bolt 15 and the nut 1
The fastening work of No. 6 can be performed by one worker, and work efficiency is improved.

In this structure, when assembling the leader 11, the end of the main pipe 12 is press-fitted along the tapers 14c, 13c of the flanges 14, 13 as described above. By press-fitting the end of the main pipe 12 along the tapers 14c and 13c in this manner, the inner diameter φD of the peripheral end of the main pipe 12 which is not necessarily a perfect circle is formed.
_P is corrected to a perfect circle. Along with this, the main pipe 1
The gap between the end of the main pipe 12 and the flanges 14 and 13 is eliminated, and the main pipe 12 and the flanges 14 and 1 are removed.
The degree of adhesion of the connection between the three is increased. Accordingly, the connection between the main pipe 12 and each of the flanges 14 and 13 is completed by welding at the single point A as described above, and defects generated in the welding are reduced and the reliability of welding is improved.

In this structure, the thickness of the body portions 14b, 13b of the flanges 14, 13 is set to the thickness t of the main pipe 12.
Thickness is greater than that, so the flange rigidity is increased. For this reason, it is not necessary to provide a large number of reinforcing ribs by welding in order to reduce the distortion of the entire reader unlike the conventional reader mounting portion structure.

As a result, according to the reader mounting portion structure of the present embodiment, the number of welding steps for assembling the reader 11 can be reduced, and the number of components of the reader 11 can be reduced. Also, because there are few welds,
Warpage generated in the reader 11 due to distortion due to welding is also reduced. For this reason, the operation of removing the warp generated in the reader 11 is reduced, and the distortion removing operation can be performed in a short time.

[0031] In the above embodiment, preventing the body portion 13b of the left flange 13, the detent portion of the outer diameter [phi] D ₂ proximate to the head of the bolt 15 is formed, the co-rotation of the bolt 15 and nut 16 did. However, the structure for preventing co-rotation is not limited to this. For example, the structure of the right flange 14 is the same as that of the above-described embodiment, and the body 1 of the left flange 13 is formed.
A structure in which a groove into which the head of the bolt 15 is fitted may be formed in the fastening portion between the bolt 15 and the nut 16 of 3b.

In this structure, the nut 16 is turned by using a fastener, and the head of the bolt 15 on the opposite side comes into contact with the groove formed in the body 13b of the flange 13 to prevent the nut 16 from rotating together. Is done. Therefore, the same effects as those of the above embodiment can be obtained by this structure.

In the above-described embodiment and the above-described modified embodiments, the case where the nut 16 is turned to fix the head of the bolt 15 with the detent is described.
May be turned to fix the nut 16 with a detent. According to this structure, the same effect as in the above embodiment can be obtained.

[0034]

As described above, according to the present invention, the nut or bolt head is turned by using a fastener, and the bolt opposite to the detent part formed on the body of the other flange is provided. The head or the nut hits and is prevented from rotating together. In addition, the nut or bolt head is turned using the fastener, and the opposite bolt head or nut hits a groove formed in the body of the other flange to prevent the nut or bolt from rotating together. For this reason, the fastening work of the bolt and the nut can be performed by one worker, and the working efficiency is improved.

Further, the end of the main pipe is press-fitted along the taper so that the shape of the peripheral end of the main pipe is corrected to a perfect circle, and a gap formed between the end of the main pipe and the flange. And the degree of adhesion of the connection part is increased. Therefore, the connection between the main pipe and the flange is completed by fixing at one place, and the reliability of welding is improved. Further, since the thickness of the body of each flange is set to be larger than the thickness of the main pipe, the rigidity of the flange is increased, and the conventional reinforcing rib is not required.

As a result, the number of welding steps for assembling the leader can be reduced, and the number of components of the leader can be reduced. In addition, the work of removing the warp generated in the leader due to the distortion due to welding can be performed in a short time.

[Brief description of the drawings]

FIG. 1A is a longitudinal sectional view of a main part of a leader attachment structure according to an embodiment of the present invention, FIG. 1B is a sectional view taken along line b in FIG. 1A, and FIG. 3 is a sectional view taken along line c of FIG.

FIG. 2A is a side view showing a configuration in which readers are connected by a reader attachment structure according to the embodiment;
(B) is a sectional view taken along line bb in (a), and (c) is a sectional view taken along line cc in (a).

3A is a side view showing a configuration in which readers are connected by a conventional reader mounting portion structure, FIG. 3B is a cross-sectional view taken along line bb of FIG. 3A, and FIG. FIG. 4 is a longitudinal sectional view of a main part of the reader mounting portion structure of FIG.

[Explanation of symbols]

11 Leader 12 Leader Main Pipe 13 Left Leader Flange 14 Right Leader Flange 13a, 14a Flanges 13b, 14b of Left Flange 13, Right Flange 14 Body 13c, 14c of Left Flange 13, Right Flange 14 Taper of left flange 13 and right flange 14 15 ... bolt 16 ... nut φD _B ... center diameter of fastening φD ₁ ... body part 13 of left flange 13 and right flange 14
b, 14b outside diameter φD ₂ ... outside diameter of detent part formed on body part 14b of left flange 13 φD ₃ ... body part 13 of left flange 13 and right flange 14
b, 14b inner diameter R _B … fastener outer circumference rotation radius B… two face widths of bolt 15 head t… wall thickness of main pipe 12

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E02D 7/14 E02D 13/04

Claims (5)

(57) [Claims] 1. A leader mounting structure for a pile driving machine in which flanges fixed to ends of a main pipe are fastened by bolts and nuts and a plurality of the main pipes are connected. The outside diameter is smaller than the diameter obtained by subtracting the outer circumference turning radius of the fastener from the fastening center diameter of the bolt and the nut, and the body of the other flange has the bolt head or the nut from the fastening center diameter. A non-rotating portion having an outer diameter that is slightly smaller than a distance obtained by subtracting half of the two surface widths is formed. 2. A leader mounting structure for a pile driving machine in which flanges fixed to ends of a main pipe are fastened by bolts and nuts and a plurality of the main pipes are connected. The outside diameter is smaller than a distance obtained by subtracting the outer circumference turning radius of the fastener from the fastening center diameter of the bolt and the nut, and the body of the other flange has a groove for fitting the bolt head or the nut. Is formed in the fastening portion, wherein the leader mounting portion structure of the pile driver is provided. 3. A leader mounting structure for a pile driver in which flanges fixed to ends of a main pipe are fastened by bolts and nuts and a plurality of the main pipes are connected, wherein each of the flanges is A taper is formed at a peripheral end portion abutting on the pipe, and each of the main pipes is press-fitted along the taper and fixed to each of the flanges. . 4. A taper is formed at a peripheral end of each of the flanges abutting on the main pipe, and the end of each of the main pipes is press-fitted along the taper and fixed to each of the flanges. The leader mounting part structure of the pile driver according to claim 1 or 2, characterized by the above-mentioned. 5. The pile driving machine according to claim 1, wherein each of the flanges has a body portion having a thickness greater than a thickness of the main pipe. Reader mounting structure.