JP2009167704A

JP2009167704A - Pile driver

Info

Publication number: JP2009167704A
Application number: JP2008007562A
Authority: JP
Inventors: Yoji Ueno; 洋路上野
Original assignee: Nippon Sharyo Ltd
Current assignee: Nippon Sharyo Ltd
Priority date: 2008-01-17
Filing date: 2008-01-17
Publication date: 2009-07-30
Anticipated expiration: 2028-01-17
Also published as: JP4980937B2

Abstract

<P>PROBLEM TO BE SOLVED: To safely interrupt an extracting operation when an excessive extraction load is applied to a leader and enhance the working efficiency and reduce the cost for the recovery of the operation by reducing the labor and time required for the recovery. <P>SOLUTION: A connection member 11 for a base machine 3 and a wire rope 12 for back tension is formed of a link member 14, an adjust member 16, and a connection pin 17 for connecting the adjust member 16 and the link member 14 to each other. A weak part 14c broken before the wire rope 12 for back tension is broken when an excessive load is applied to the wire rope 12 for back tension is formed on the link member 14. Extraction prevention means for preventing the link member 14 from coming out of the adjust member 16 are attached to the link member 14 and the adjust member 16, respectively. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、杭打機に関し、詳しくは、リーダ頂部のトップシーブフレーム後部側とベースマシンとの間にバックテンション用ワイヤロープを備えた杭打機に関する。 The present invention relates to a pile driving machine, and more particularly, to a pile driving machine including a back tension wire rope between a rear side of a top sheave frame at a leader top and a base machine.

杭打機は、ベースマシンの前部に立設したリーダに沿ってオーガなどの作業装置を昇降させることにより、オーガスクリューなどの施工を行うものであって、オーガスクリューの推進力や引抜力によってリーダには前方に向かう曲げ荷重が作用し、この曲げ荷重が大きくなるとリーダが前方に撓んで施工に悪影響がでるため、リーダの後部側にバックテンション用ワイヤロープを設けて前記曲げ荷重をリーダの軸方向に作用する圧縮荷重に変換することにより、リーダの撓みを防止するようにしている（例えば、特許文献１参照。）。
特開２００１−３３６１５０号公報 The pile driver performs construction of auger screws and the like by raising and lowering a working device such as an auger along a leader erected at the front of the base machine. A bending load directed forward is applied to the leader, and when the bending load increases, the leader bends forward and adversely affects the construction. Therefore, a back tension wire rope is provided on the rear side of the leader, and the bending load is applied to the leader. By converting to a compressive load acting in the axial direction, the reader is prevented from bending (for example, see Patent Document 1).
JP 2001-336150 A

このような杭打機では、過大な引抜荷重などによってリーダが座屈することを防止するため、バックテンション用ワイヤロープの破断荷重をリーダの座屈荷重より小さく設定し、リーダが座屈する前にバックテンション用ワイヤロープを破断させてリーダを保護するようにしていた。 In such a pile driver, in order to prevent the leader from buckling due to an excessive pulling load or the like, the breaking load of the back tension wire rope is set to be smaller than the buckling load of the leader, and the back before the leader buckles. The leader wire was protected by breaking the tension wire rope.

しかし、バックテンション用ワイヤロープが破断したときの破断位置によっては、破断したバックテンション用ワイヤロープが２０〜３０ｍの高さからベースマシン上に落下することがあり、ベースマシンを損傷する虞があった。 However, depending on the breaking position when the back tension wire rope breaks, the broken back tension wire rope may fall on the base machine from a height of 20 to 30 m, possibly damaging the base machine. It was.

また、作業の復帰には、バックテンション用ワイヤロープを交換する必要があるだけでなく、バックテンション用ワイヤロープを交換するためにリーダを分解する必要があるなど、多大な手間や時間、コストを要していた。 In addition to returning the work, it is not only necessary to replace the back tension wire rope, but it is also necessary to disassemble the reader to replace the back tension wire rope. It was necessary.

そこで本発明は、過大な引抜荷重などが作用したときに、バックテンション用ワイヤロープを破断させることなくリーダを保護することができ、高所からバックテンション用ワイヤロープが落下することもなく、作業の復帰に掛かる手間や時間を少なくし、コストの低減を図ることができる杭打機を提供することを目的としている。 Therefore, the present invention can protect the leader without breaking the back tension wire rope when an excessive pulling load or the like is applied, and the back tension wire rope does not fall from a high place. An object of the present invention is to provide a pile driving machine that can reduce the labor and time required for the return and reduce the cost.

上記目的を達成するため、本発明の杭打機は、ベースマシンの前部に立設されたリーダの頂部中心部にトップシーブフレームを揺動可能に取り付けるとともに、該トップシーブフレームの後部側と前記ベースマシンとの間にバックテンション用ワイヤロープを設けた杭打機において、前記バックテンション用ワイヤロープの下端部と前記ベースマシンとを連結する連結部材に、前記バックテンション用ワイヤロープの破断荷重より小さな荷重で破断する脆弱部を設けるとともに、該脆弱部が破断したときに前記バックテンション用ワイヤロープの下端部をベースマシン側に保持する保持部を設けたことを特徴とし、前記連結部材は、前記バックテンション用ワイヤロープの下端部に連結されるリンク部材と、前記ベースマシンに取り付けられて前記リンク部材を上下方向に移動可能に収容するアジャスト部材と、該アジャスト部材と前記リンク部材とを連結する連結ピンとを備え、該連結ピン及び前記リンク部材のいずれか一方に、前記バックテンション用ワイヤロープに過大な荷重が掛かった時に、該バックテンション用ワイヤロープが破断するより前に破断する脆弱部を設けるとともに、前記リンク部材とアジャスト部材とに、前記脆弱部が破断した際に、前記リンク部材がアジャスト部材から抜け出ることを防止してバックテンション用ワイヤロープの下端部を保持する抜け止め手段を備えているものでもよい。 In order to achieve the above object, the pile driving machine of the present invention has a top sheave frame swingably attached to the center of the top of a leader standing upright at the front of the base machine, and a rear side of the top sheave frame. In the pile driving machine provided with a back tension wire rope between the base machine and the connecting member that connects the lower end portion of the back tension wire rope and the base machine, the breaking load of the back tension wire rope In addition to providing a fragile portion that breaks with a smaller load, and a holding portion that holds the lower end portion of the back tension wire rope on the base machine side when the fragile portion is broken, the connecting member A link member coupled to the lower end of the back tension wire rope and attached to the base machine An adjustment member that accommodates the link member so as to be movable in the vertical direction; and a connection pin that connects the adjustment member and the link member, and the back tension wire is connected to either the connection pin or the link member. When an excessive load is applied to the rope, a fragile portion that breaks before the back tension wire rope breaks is provided, and when the fragile portion breaks in the link member and the adjustment member, the link It may be provided with a retaining means for preventing the member from slipping out of the adjusting member and holding the lower end portion of the back tension wire rope.

また、前記リンク部材と前記アジャスト部材とを上下方向に長尺に形成し、前記アジャスト部材内に前記リンク部材を収容し、アジャスト部材の長手方向に設けた複数のピン挿通孔の一つとリンク部材の下部に設けたピン挿通孔とに前記連結ピンを挿通してアジャスト部材とリンク部材とを連結し、前記リンク部材の前記ピン挿通孔よりも上方に、幅狭に形成した前記脆弱部を設けるとともに、前記抜け止め手段は、前記リンク部材の前記脆弱部と前記バックテンション用ワイヤロープとの連結部との間に形成した上下方向の長孔と、前記アジャスト部材から前記長孔内に突設された抜け止めピンとで構成され、前記脆弱部が破断したときに、該抜け止めピンと前記長孔の下端部とが当接して前記リンク部材が抜け止めされるものや、前記リンク部材と前記アジャスト部材とを上下方向に長尺に形成し、前記アジャスト部材内に前記リンク部材を収容し、アジャスト部材の長手方向に設けた複数のピン挿通孔の一つとリンク部材の下部に設けたピン挿通孔とに前記連結ピンを挿通してアジャスト部材とリンク部材とを連結し、前記連結ピンに周溝から成る前記脆弱部を形成するとともに、前記抜け止め手段は、前記リンク部材の前記ピン挿通孔と前記バックテンション用ワイヤロープとの連結部との間に形成した上下方向の長孔と、前記アジャスト部材から前記長孔内に突設された抜け止めピンとで構成され、前記脆弱部が破断したときに、該抜け止めピンと前記長孔の下端部とが当接して前記リンク部材が抜け止めされるものでもよい。 Further, the link member and the adjustment member are formed to be long in the vertical direction, the link member is accommodated in the adjustment member, and one of a plurality of pin insertion holes provided in the longitudinal direction of the adjustment member and the link member The connecting pin is inserted into a pin insertion hole provided in a lower portion of the link member to connect the adjustment member and the link member, and the weakened portion formed narrowly is provided above the pin insertion hole of the link member. In addition, the retaining means includes a vertically extending long hole formed between the fragile portion of the link member and the connecting portion of the back tension wire rope, and protrudes from the adjusting member into the elongated hole. And the link member is prevented from coming off when the fragile portion is broken and the lower end portion of the elongated hole comes into contact with the retaining member. The adjustment member and the adjustment member are formed to be long in the vertical direction, the link member is accommodated in the adjustment member, and one of a plurality of pin insertion holes provided in the longitudinal direction of the adjustment member and the lower part of the link member The connecting pin is inserted into the provided pin insertion hole to connect the adjusting member and the link member, and the weakened portion formed of a circumferential groove is formed in the connecting pin. It is composed of a vertical hole formed between the pin insertion hole and the connecting portion of the back tension wire rope, and a retaining pin protruding from the adjustment member into the long hole, and the fragile When the portion breaks, the retaining pin and the lower end of the elongated hole may come into contact with each other to prevent the link member from coming off.

本発明の杭打機によれば、バックテンション用ワイヤロープに過大な荷重が作用したときに、連結部材に設けた脆弱部が先に破断するので、バックテンション用ワイヤロープを破断させずにリーダの座屈を防止できる。したがって、バックテンション用ワイヤロープが高所から落下することがなく、作業の復帰は、破断した連結部材の部品を交換するだけでよいことから、短時間かつ低コストで作業を再開することができる。また、連結部材の脆弱部が破断したときにバックテンション用ワイヤロープの下端部を保持することにより、バックテンション用ワイヤロープが跳ね上がってリーダなどを破損することを防止できる。 According to the pile driving machine of the present invention, when an excessive load is applied to the back tension wire rope, the weakened portion provided in the connecting member breaks first, so that the leader without breaking the back tension wire rope. Can be prevented from buckling. Therefore, the back tension wire rope does not fall from a high place, and the work can be restored simply by replacing the broken parts of the connecting member. Therefore, the work can be resumed in a short time and at a low cost. . Further, by holding the lower end portion of the back tension wire rope when the fragile portion of the connecting member breaks, it is possible to prevent the back tension wire rope from jumping up and damaging the leader or the like.

図１乃至図４は本発明の杭打機の第１形態例を示す図で、図１はバックテンション用ワイヤロープの連結具を示す正面図、図２は図１のII-II断面図、図３はリンク部材が破断した状態を示す連結具の要部断面正面図、図４は杭打機の正面図である。 1 to 4 are views showing a first embodiment of the pile driving machine of the present invention, FIG. 1 is a front view showing a connecting tool for a back tension wire rope, and FIG. 2 is a sectional view taken along line II-II in FIG. FIG. 3 is a cross-sectional front view of the main part of the connector showing a state in which the link member is broken, and FIG. 4 is a front view of the pile driving machine.

本形態例に示す杭打機１は、クローラ２ａを備えた走行部２と、該走行部２上に旋回可能に設けられたベースマシン３と、該ベースマシン３の前部に設けられたフロントブラケット３ａに支持され、前方にガイド４ａを備えたリーダ４と、該リーダ４を後方から支持するバックステー５と、前記リーダ４の頂部に設けられたトップシーブフレーム６とを備えている。 The pile driving machine 1 shown in the present embodiment includes a traveling unit 2 provided with a crawler 2a, a base machine 3 provided on the traveling unit 2 so as to be able to turn, and a front provided at a front portion of the base machine 3. A reader 4 supported by the bracket 3a and provided with a guide 4a in the front, a back stay 5 for supporting the reader 4 from the rear, and a top sheave frame 6 provided on the top of the reader 4 are provided.

トップシーブフレーム６は、リーダ４の頂部中心部に設けた取付ピン６ａによって前後方向に揺動可能に支持され、トップシーブフレーム前方側に上部シーブ７が、トップシーブフレーム後方側にロープ掛金具８がそれぞれ設けられている。上部シーブ７には、下部にスクリュー９ａを備えたオーガ９などの作業装置を昇降させるオーガ用ワイヤロープ１０が架け渡され、ロープ掛金具８には、下端部が連結部材１１を介してベースマシン３に連結されたバックテンション用ワイヤロープ１２の上端部が取り付けられている。 The top sheave frame 6 is supported by a mounting pin 6a provided at the center of the top of the leader 4 so as to be swingable in the front-rear direction. The top sheave 7 is on the front side of the top sheave frame, and the rope hook 8 is on the rear side of the top sheave frame. Are provided. An auger wire rope 10 that lifts and lowers a working device such as an auger 9 having a screw 9 a at the lower part is bridged on the upper sheave 7. An upper end portion of a back tension wire rope 12 connected to 3 is attached.

連結部材１１は、バックテンション用ワイヤロープ１２の下端部に設けられた二股状の取付具１３に連結されるリンク部材１４と、ベースマシン３に設けられた二股状のブラケット１５に連結されるアジャスト部材１６と、該アジャスト部材１６と前記リンク部材１４とを連結する連結ピン１７とを備えている。リンク部材１４は、長尺な板部材で形成され、上部に前記取付具１３とリンク部材１４とを連結するリンク取付ピン１８の取付孔１４ａが、下部に前記連結ピン１７のピン挿通孔１４ｂがそれぞれ形成され、該ピン挿通孔１４ｂの上部に幅狭に括れた状態に形成した脆弱部１４ｃが設けられるとともに、該脆弱部１４ｃと前記取付孔１４ａとの間には上下方向の長孔１４ｄが形成されている。 The connecting member 11 includes a link member 14 connected to a bifurcated fixture 13 provided at the lower end of the back tension wire rope 12 and an adjuster connected to a bifurcated bracket 15 provided in the base machine 3. A member 16 and a connecting pin 17 that connects the adjusting member 16 and the link member 14 are provided. The link member 14 is formed of a long plate member, and an attachment hole 14a of the link attachment pin 18 for connecting the attachment 13 and the link member 14 to the upper part, and a pin insertion hole 14b of the connection pin 17 to the lower part. A fragile portion 14c formed in a narrowed state is provided at the top of the pin insertion hole 14b, and a vertically elongated hole 14d is formed between the fragile portion 14c and the mounting hole 14a. Is formed.

アジャスト部材１６は、前記リンク部材１４を収容可能な縦長の箱状に形成されたものであって、上端に開口部１６ａを備えたケース状の本体部１６ｂと、該本体部１６ｂの下部を固定ピン１９により前記ブラケット１５に固着する固着部１６ｃとを備え、該固着部１６ｃには固定ピン１９の装着孔１６ｄが形成されている。本体部１６ｂの対向する両側面１６ｅ，１６ｅには、上下５対のピン挿通孔１６ｆが上下方向に等間隔でそれぞれ対向して形成されている。また、前記両側面１６ｅ，１６ｅの上部には、抜止めピン２０を装着する一対の挿通孔１６ｇ，１６ｇが設けられている。さらに、アジャスト部材１６の一側面１６ｇには、最も上部のピン挿通孔１６ｆの上部と、最も下部のピン挿通孔１６ｆの下部とに、シャフト挿通片１６ｈ，１６ｈがそれぞれ突設されている。連結ピン１７は、アジャスト部材１６の一対のピン挿通孔１６ｆ，１６ｆに挿通可能な長さを備え、基端部にはリング状のシャフト挿通片１７ａが突設されている。 The adjustment member 16 is formed in a vertically long box shape that can accommodate the link member 14. The adjustment member 16 fixes a case-like main body portion 16 b having an opening 16 a at the upper end and a lower portion of the main body portion 16 b. A fixing portion 16c fixed to the bracket 15 by a pin 19 is provided, and a mounting hole 16d for the fixing pin 19 is formed in the fixing portion 16c. On the opposite side surfaces 16e, 16e of the main body portion 16b, five pairs of upper and lower pin insertion holes 16f are formed facing each other at equal intervals in the vertical direction. In addition, a pair of insertion holes 16g and 16g for mounting the retaining pins 20 are provided on the upper sides of the both side surfaces 16e and 16e. Further, on one side surface 16g of the adjusting member 16, shaft insertion pieces 16h and 16h project from the upper part of the uppermost pin insertion hole 16f and the lower part of the lowermost pin insertion hole 16f, respectively. The connecting pin 17 has a length that can be inserted into the pair of pin insertion holes 16f, 16f of the adjustment member 16, and a ring-shaped shaft insertion piece 17a projects from the base end portion.

この連結部材１１の組み付けは、前記リンク部材１４の上部を前記バックテンション用ワイヤロープ１２の二股状の取付具１３の間に挿入し、該取付具１３に形成された通孔１３ａ，１３ａとリンク部材１４の取付孔１４ａとにリンク取付ピン１８を装着してリンク部材１４とバックテンション用ワイヤロープ１２とを連結するとともに、アジャスト部材１６の固着部１６ｃをベースマシン３に設けられた二股状のブラケット１５の間に挿入し、該ブラケット１５の通孔とアジャスト部材１６の装着孔１６ｄとに固定ピン１９を装着することにより、アジャスト部材１６とベースマシン３とを連結する。 The connecting member 11 is assembled by inserting the upper portion of the link member 14 between the bifurcated attachments 13 of the back tension wire rope 12 and linking with the through holes 13a and 13a formed in the attachment 13. A link attachment pin 18 is attached to the attachment hole 14 a of the member 14 to connect the link member 14 and the back tension wire rope 12, and a fixing portion 16 c of the adjustment member 16 is a bifurcated shape provided in the base machine 3. The adjusting member 16 and the base machine 3 are connected by inserting the fixing pin 19 into the through hole of the bracket 15 and the mounting hole 16 d of the adjusting member 16.

次に、アジャスト部材１６の開口部１６ａからリンク部材１４を挿入し、バックテンション用ワイヤロープ１２の張りを調整してアジャスト部材１６の対向するピン挿通孔１６ｆ，１６ｆとリンク部材１４のピン挿通孔１４ｂとに連結ピン１７を挿入し、アジャスト部材１６とリンク部材１４とを連結することにより、バックテンション用ワイヤロープ１２の下端部とベースマシン３とを連結部材１１により連結する。さらに、アジャスト部材１６の上部に形成した一対の挿通孔１６ｇ，１６ｇに、リンク部材１４の長孔１４ｄを通して抜止めピン２０を装着するとともに、アジャスト部材１６と連結ピン１７とに突設したシャフト挿通片１６ｈ，１６ｈ，１７ａの挿通孔に抜止めシャフト２１を挿入して連結ピン１７を抜け止めする。 Next, the link member 14 is inserted from the opening 16a of the adjusting member 16, the tension of the back tension wire rope 12 is adjusted, and the pin insertion holes 16f, 16f facing the adjustment member 16 and the pin insertion hole of the link member 14 are adjusted. The connecting pin 17 is inserted into 14 b and the adjusting member 16 and the link member 14 are connected, whereby the lower end portion of the back tension wire rope 12 and the base machine 3 are connected by the connecting member 11. Further, a retaining pin 20 is attached to the pair of insertion holes 16g, 16g formed in the upper part of the adjustment member 16 through the long hole 14d of the link member 14, and a shaft insertion projecting from the adjustment member 16 and the connecting pin 17 is provided. The retaining shaft 21 is inserted into the insertion holes of the pieces 16h, 16h, 17a to prevent the connecting pin 17 from coming off.

このように形成された杭打機１において、前記リンク部材１４の脆弱部１４ｃは、前記バックテンション用ワイヤロープ１２の破断荷重より小さな引張破断荷重となる断面積に設定されており、作業中にスクリュー９ａの推進力や引抜力によってバックテンション用ワイヤロープ１２に引張荷重が作用すると、取付具１３及びリンク取付ピン１８を介してリンク部材１４にも引張荷重が作用し、脆弱部１４ｃに引張応力が掛かる。そして、バックテンション用ワイヤロープ１２に大きな引張荷重が作用したときには、バックテンション用ワイヤロープ１２及び連結部材１１の中で構造的に最も弱く設定されている脆弱部１４ｃが破断し、他のバックテンション用の部材、特にバックテンション用ワイヤロープ１２が破断することを防止しながらリーダ４の座屈を回避することができる。 In the pile driving machine 1 formed in this way, the weakened portion 14c of the link member 14 is set to have a cross-sectional area having a tensile breaking load smaller than the breaking load of the back tension wire rope 12, and during the operation, When a tensile load is applied to the back tension wire rope 12 by the propulsion force or pulling force of the screw 9a, the tensile load is also applied to the link member 14 via the fixture 13 and the link mounting pin 18, and the tensile stress is applied to the fragile portion 14c. It takes. When a large tensile load is applied to the back tension wire rope 12, the weakest portion 14 c that is structurally weakest among the back tension wire rope 12 and the connecting member 11 breaks, and other back tension It is possible to avoid buckling of the leader 4 while preventing breakage of the members for use, particularly the back tension wire rope 12.

さらに、脆弱部１４ｃが破断すると、バックテンション用ワイヤロープ１２に引っ張られてリンク部材１４が上方に跳ね上がる状態になるが、リンク部材１４に設けた長孔１４ｄの下端部が前記抜止めピン２０に当接することにより、リンク部材１４がアジャスト部材１６から飛び出すことを防止でき、バックテンション用ワイヤロープ１２の下端部が上方に跳ね上がってリーダ４やオーガ用ワイヤロープ１０、油圧配管などに当たり、これらを損傷することを防止できる。 Further, when the fragile portion 14c is broken, the link member 14 is pulled up by the back tension wire rope 12, but the lower end portion of the long hole 14d provided in the link member 14 is connected to the retaining pin 20. By abutting, the link member 14 can be prevented from jumping out of the adjustment member 16, and the lower end portion of the back tension wire rope 12 jumps upward and hits the leader 4, the auger wire rope 10, hydraulic piping, etc., and damages them. Can be prevented.

また、杭打機１を復帰させる際には、破断したリンク部材１４の交換作業を行うだけでよく、バックテンション用ワイヤロープ１２の交換やリーダ４の分解、組立を行う必要がないことから、復帰作業に掛かる手間や時間を少なくすることができ、作業性の大幅な向上を図ることができるとともにコストの低減も図ることができる。 Further, when returning the pile driving machine 1, it is only necessary to replace the broken link member 14, and it is not necessary to replace the wire rope 12 for back tension and to disassemble and assemble the leader 4. The labor and time required for the return work can be reduced, and the workability can be greatly improved and the cost can be reduced.

図５乃至図７は本発明の第２形態例を示し、図５はバックテンション用ワイヤロープの連結具を示す正面図、図６は図５のVI−VI断面図、図７は連結ピンが破断した状態を示す連結具の要部断面正面図である。なお、前記第１形態例と同様の構成要素を示すものには、同一の符号を付して、その詳細な説明は省略する。 5 to 7 show a second embodiment of the present invention, FIG. 5 is a front view showing a connecting tool for a back tension wire rope, FIG. 6 is a sectional view taken along VI-VI in FIG. 5, and FIG. It is a principal part sectional front view of a connector showing the state where it fractured. In addition, the same code | symbol is attached | subjected to what shows the component similar to the said 1st example, and the detailed description is abbreviate | omitted.

本形態例は、前記リンク部材１４には脆弱部を設けず、連結ピン１７の軸部に周方向に形成した２本の周溝で脆弱部１７ｂ，１７ｂを形成している。この脆弱部１７ｂ，１７ｂは、リンク部材１４の両側に位置しており、脆弱部１７ｂ，１７ｂが破断したときに、中央部がリンク部材１４のピン挿通孔１４ｂ内に残り、両端部がアジャスト部材１６の両ピン挿通孔１６ｆ内に残るように形成されている。また、シャフト挿通片１６ｈ，１６ｈの反対面には、破断した連結ピン１７の先端部がピン挿通孔１６ｆから飛び出ることを防止するガードバー２２が設けられている。 In this embodiment, the link member 14 is not provided with a fragile portion, and the fragile portions 17b and 17b are formed by two circumferential grooves formed in the circumferential direction on the shaft portion of the connecting pin 17. The fragile portions 17b and 17b are located on both sides of the link member 14. When the fragile portions 17b and 17b are broken, the central portion remains in the pin insertion hole 14b of the link member 14, and both end portions are adjustment members. It is formed so as to remain in both the 16 pin insertion holes 16f. A guard bar 22 is provided on the opposite surface of the shaft insertion pieces 16h, 16h to prevent the tip of the broken connecting pin 17 from jumping out of the pin insertion hole 16f.

本形態例では、連結ピン１７の脆弱部１７ｂ，１７ｂを、前記バックテンション用ワイヤロープ１２の破断荷重より小さな剪断破断荷重となる断面積に設定しており、バックテンション用ワイヤロープ１２に大きな引張荷重が作用したときには、バックテンション用ワイヤロープ１２が破断する前に連結ピン１７の脆弱部１７ｂ，１７ｂが破断するようにしている。 In this embodiment, the fragile portions 17b, 17b of the connecting pin 17 are set to have a cross-sectional area having a shear breaking load smaller than the breaking load of the back tension wire rope 12, and the back tension wire rope 12 has a large tensile force. When a load is applied, the fragile portions 17b and 17b of the connecting pin 17 are broken before the back tension wire rope 12 is broken.

このように、バックテンション用ワイヤロープ１２に大きな引張荷重が作用したときに、バックテンション用ワイヤロープ１２が破断する前に破断する脆弱部１４ｃ，１７ｂを連結部材１１に設けておくことにより、バックテンション用ワイヤロープ１２が破断することを防止でき、破断したバックテンション用ワイヤロープ１２が高所からベースマシン３上に落下してベースマシン３上の各部が損傷することを防止できる。さらに、リンク部材１４の長孔１４ｄと抜止めピン２０とによってバックテンション用ワイヤロープ１２の下端部をベースマシン３に保持することにより、バックテンション用ワイヤロープ１２の下端部が跳ね上がることも防止できる。 In this way, by providing the connecting member 11 with weak portions 14c and 17b that break before the back tension wire rope 12 breaks when a large tensile load acts on the back tension wire rope 12, the back tension wire rope 12 The tension wire rope 12 can be prevented from breaking, and the broken back tension wire rope 12 can be prevented from falling onto the base machine 3 from a height and damaging each part on the base machine 3. Furthermore, the lower end portion of the back tension wire rope 12 can be prevented from jumping up by holding the lower end portion of the back tension wire rope 12 to the base machine 3 by the long hole 14d of the link member 14 and the retaining pin 20. .

なお、本発明の杭打機は、上述の各形態例に限るものではなく、バックテンション用ワイヤロープの下端部を油圧シリンダに連結したものにも適用でき、連結部材を鉛直方向に配置せずに、例えば、バックテンション用ワイヤロープの下端部をシーブを介して水平方向とし、水平方向に配置した連結部材を介してベースマシンに連結することもできる。また、リンク部材をベースマシンに取り付け、アジャスト部材をバックテンション用ワイヤロープに取り付けることもできる。さらに、バックテンション用ワイヤロープを複数本有するものにも適用可能である。 Note that the pile driving machine of the present invention is not limited to the above-described embodiments, but can be applied to a back tension wire rope having a lower end connected to a hydraulic cylinder, and the connecting member is not arranged in the vertical direction. In addition, for example, the lower end portion of the back tension wire rope may be set in the horizontal direction via the sheave and connected to the base machine via a connecting member arranged in the horizontal direction. Further, the link member can be attached to the base machine, and the adjustment member can be attached to the back tension wire rope. Further, the present invention can be applied to one having a plurality of back tension wire ropes.

本発明の第１形態例を示すバックテンション用ワイヤロープの連結具を示す正面図である。It is a front view which shows the coupling tool of the wire rope for back tension which shows the 1st form example of this invention. 図１のII-II断面図である。It is II-II sectional drawing of FIG. 同じくリンク部材が破断した状態を示す連結具の要部断面正面図である。It is a principal part sectional front view of a connector showing the state where a link member fractured similarly. 同じく杭打機の正面図である。It is a front view of a pile driver similarly. 本発明の第２形態例を示すバックテンション用ワイヤロープの連結具を示す正面図である。It is a front view which shows the coupling tool of the wire rope for back tension which shows the 2nd form example of this invention. 図５のVI−VI断面図である。It is VI-VI sectional drawing of FIG. 同じく連結ピンが破断した状態を示す連結具の要部断面正面図である。It is a principal part sectional front view of a connector showing the state where a connecting pin fractured similarly.

Explanation of symbols

１…杭打機、２…走行部、２ａ…クローラ、３…ベースマシン、３ａ…フロントブラケット、４…リーダ、４ａ…ガイド、５…バックステー、６…トップシーブフレーム、６ａ…取付ピン、７…上部シーブ、８…ロープ掛金具、９…オーガ、９ａ…スクリュー、１０…オーガ用ワイヤロープ、１１…連結部材、１２…バックテンション用ワイヤロープ、１３…取付具、１４…リンク部材、１４ａ…取付孔、１４ｂ…ピン挿通孔、１４ｃ…脆弱部、１４ｄ…長孔、１５…ブラケット、１６…アジャスト部材、１６ａ…開口部、１６ｂ…本体部、１６ｃ…固着部、１６ｄ…装着孔、１６ｅ…側面、１６ｆ…ピン挿通孔、１６ｇ…挿通孔、１６ｈ…シャフト挿通片、１７…連結ピン、１７ａ…シャフト挿通片、１７ｂ…脆弱部、１８…リンク取付ピン、１９…固定ピン、２０…抜止めピン、２１…抜止めシャフト、２２…ガードバー DESCRIPTION OF SYMBOLS 1 ... Pile driver, 2 ... Running part, 2a ... Crawler, 3 ... Base machine, 3a ... Front bracket, 4 ... Leader, 4a ... Guide, 5 ... Back stay, 6 ... Top sheave frame, 6a ... Mounting pin, 7 ... upper sheave, 8 ... rope hook, 9 ... auger, 9a ... screw, 10 ... wire rope for auger, 11 ... connecting member, 12 ... wire rope for back tension, 13 ... fixture, 14 ... link member, 14a ... Mounting hole, 14b ... Pin insertion hole, 14c ... Fragile part, 14d ... Long hole, 15 ... Bracket, 16 ... Adjusting member, 16a ... Opening part, 16b ... Main part, 16c ... Adhering part, 16d ... Mounting hole, 16e ... Side surface, 16f ... Pin insertion hole, 16g ... Insertion hole, 16h ... Shaft insertion piece, 17 ... Connecting pin, 17a ... Shaft insertion piece, 17b ... Fragile part, 18 ... Link mounting pin , 19 ... fixing pin, 20 ... fixing pin, 21 ... retaining shaft 22 ... guard bar

Claims

A top sheave frame is swingably attached to the center of the top of the leader standing at the front of the base machine, and a back tension wire rope is provided between the rear side of the top sheave frame and the base machine. In the pile driver, the connecting member that connects the lower end portion of the back tension wire rope and the base machine is provided with a fragile portion that breaks with a load smaller than the rupture load of the back tension wire rope. A pile driving machine comprising a holding portion for holding the lower end portion of the back tension wire rope on the base machine side when the wire breaks.

The connecting member includes a link member connected to a lower end portion of the back tension wire rope, an adjustment member that is attached to the base machine and accommodates the link member so as to be movable in the vertical direction, the adjustment member, and the A connecting pin for connecting the link member to the link member, and when an excessive load is applied to the connecting wire or the link member before the back tension wire rope breaks. The link member and the adjustment member are provided with a fragile portion that breaks, and when the fragile portion breaks, the link member is prevented from coming out of the adjustment member and the lower end portion of the back tension wire rope is held. The pile driving machine according to claim 1, further comprising retaining means for preventing the slipping.

The link member and the adjustment member are formed long in the vertical direction, the link member is accommodated in the adjustment member, and one of a plurality of pin insertion holes provided in the longitudinal direction of the adjustment member and the lower part of the link member The adjustment pin and the link member are connected to the pin insertion hole provided in the link member by connecting the adjustment member and the link member, and the weakened portion formed narrowly is provided above the pin insertion hole of the link member, and The retaining means protrudes into the elongated hole from the vertical member formed between the fragile portion of the link member and the connecting portion between the back tension wire rope and the adjust member. The link member is constituted by a retaining pin, and when the fragile portion is broken, the retaining member and the lower end portion of the elongated hole come into contact with each other to prevent the link member from coming off. 2 pile driver described.

The link member and the adjustment member are formed long in the vertical direction, the link member is accommodated in the adjustment member, and one of a plurality of pin insertion holes provided in the longitudinal direction of the adjustment member and the lower part of the link member The adjusting pin and the link member are connected to the pin insertion hole provided in the connecting pin to connect the adjusting member and the link member, and the weakened portion including a circumferential groove is formed in the connecting pin. A vertical hole formed between the pin insertion hole and the connecting portion of the back tension wire rope, and a retaining pin protruding from the adjustment member into the long hole, The pile driving machine according to claim 2, wherein when the fragile portion breaks, the retaining pin and the lower end of the elongated hole come into contact with each other to prevent the link member from coming off.