JP4516910B2 - Suspended pile driver - Google Patents

Description

According to the present invention, a working device, which is connected to a tip of a boom that can be raised and lowered with respect to a base machine by a pin connection and is supported in an upright posture, is mounted so as to be movable up and down through the top sheave of the leader. The present invention relates to a hanging pile driver that is moved up and down by a wire rope.

  As shown in FIG. 5, a suspended pile driving machine used for construction and civil engineering work is an upper swing body provided with a cockpit, a hydraulic unit, a winch or the like with respect to a lower traveling body 101 that can be traveled by a crawler. 102 is provided so that turning is possible. A boom 103 is attached to a base machine composed of the lower traveling body 101 and the upper swing body 102 in a slidable manner in front of the upper swing body 102. The boom 103 is assembled as a single body by a plurality of joint booms having a truss structure, so that the boom 103 is pulled up from the rear as shown in the figure by the wire rope 105 from the winch 111 hanged through the gantry 104 and stands up. It has become.

A leader 106 is pin-coupled and suspended from the tip of the boom 103 in a state of protruding upward from the tip, and the lower end side is supported by an arm 107 extending forward from the upper swing body 102 and stands upright. The reader 106 is held in the state. An auger 80 or the like that is a working device is attached to the leader 106 so as to be able to move up and down, and is suspended by a wire rope 110 that is suspended through the top sheave 108 of the leader 106. The wire rope 110 is fed from the winch 112 of the upper swing body 102, and the auger 80 moves up and down along the leader 106 by unwinding and unwinding the winch 112. The auger 80 is connected to a casing 90, a drilling rod, and the like, and the casing 90 is rotationally press-fitted into the ground by receiving rotation from the auger 80, or the ground is excavated by the drilling rod.
JP-A-4-228722

  However, in the conventional suspended pile driving machine 100, for example, when the casing 90 is pulled out after rotational press-fitting into the ground by the casing 90, the moment applied to the upper part of the leader 106 at a position higher than the tip of the boom 103 increases. There is a problem that the reader 106 is deformed at the top. That is, when the casing 90 is rotationally press-fitted, it enters into the ground by a propulsion force by a spiral blade (not shown) or the dead weight of the auger 80 or the like, but when the casing 90 is pulled out, the wire rope that suspends the auger 80 is used. Must be pulled up through 110. In particular, recently, a large-sized auger 80 having a large output has been used, and construction using a large-diameter casing 90 has increased. Therefore, the tensile load applied to the wire rope 110 also increases when the casing 90 is pulled out, and the force acting on the reader 106 is also increased accordingly.

The wire rope 110 sent out from the winch 112 of the upper swing body 102 is sent forward from the rear through the top sheave 108 of the leader 106, and the auger 80 attached to the leader 106 is suspended. Therefore, a bending moment is generated depending on the length of the arm of the top sheave 108, and this also acts on the leader 106.
In the suspended pile driving machine 100, the leader 106 is connected in a state of protruding upward from a point p pin-connected to the boom 103 in order to increase the lifting stroke of the auger 80. Therefore, when a large bending moment acts on the reader 106, bending deformation may occur in the upper portion 106a of the reader.

  Therefore, an object of the present invention is to provide a suspended pile driving machine that reduces the moment applied to the leader in order to solve such a problem.

The suspended pile driving machine according to the present invention is configured to unwind and wind a wire rope fed from a winch of a base machine, with a leader connected to and supported by a base machine boom at a position higher than the boom tip. The work device mounted on the leader is moved up and down by returning, and the top sheave of the leader is provided with a plurality of front sheaves and rear sheaves at the front and rear, and the leader or boom has the leader attached to the boom. A plurality of balance sheaves are provided in proximity to the connecting portion pin-coupled to the tip, and a wire rope spanned from the rear of the leader to the front working device via the top sheave is connected to the balance sheave at the rear of the leader. It is characterized in that it can be passed multiple times with the rear sheave.

Further, the suspended pile driver according to the present invention has a connection bracket for pin-connecting the leader to the boom at a position away from the top sheave, and the sheave bracket is fixed to the connection bracket. It is preferable that a plurality of balance sheaves are provided on the bracket.
Further, the suspended pile driver according to the present invention is configured to pin-couple the leader and the boom from the first sheave bracket provided at the boom front end portion and the first sheave bracket at the rear side of the boom. It is preferable that a second sheave bracket provided at a position close to the connecting bracket is fixed, and a plurality of the balance sheaves are provided on the second sheave bracket.

Moreover, it is preferable that the suspension type pile driving machine which concerns on this invention uses the suspension sheave provided in the said boom tip part for boom suspension as the said balance sheave.
In the suspended pile driving machine according to the present invention, the guide sheave provided at the tip of the boom for guiding the wire rope to the top sheave is preferably the balance sheave.

  On the other hand, the wire rope passing method of the suspended pile driver according to the present invention is such that the leader is connected to the boom of the base machine so that the upper part protrudes to a position higher than the tip of the boom, and the working device is attached to the leader. In order to move the wire rope up and down with the wire rope sent out from the winch of the base machine, the wire rope is passed from the back of the leader to the front through the top sheave of the leader having a plurality of front sheaves and rear sheaves. In front of the leader, it is passed a plurality of times between the front sheave and the sheave of the working device, and also in the back of the leader a plurality of times between the rear sheave and the balance sheave provided at the connecting portion between the leader and the boom. It is characterized by being handed over.

  Therefore, according to the present invention, since the wire rope is reciprocally hung behind the reader, the number of hanger behind the reader, which was only one in the prior art, becomes plural, and the back tension behind the reader can be increased. The bending moment acting on the upper part of the leader higher than the connecting part at the tip of the boom can be greatly reduced.

Next, an embodiment of a suspended pile driver according to the present invention will be described below with reference to the drawings. FIG. 1 is a view showing a suspended pile driving machine according to the first embodiment.
The suspension pile driving machine 10 is provided so that an upper turning body 3 having a cockpit, a hydraulic unit, a winch or the like can turn with respect to a lower traveling body 2 that can be driven by a crawler, as in the conventional example. It has been. A boom 4 for suspending a working device is attached to the base machine composed of the lower traveling body 2 and the upper revolving body 3 so as to be raised and lowered in front of the upper revolving body 3.

The boom 4 is provided such that the lower boom 4a is pivotally supported in front of the upper swing body 3 and can swing in the front-rear direction of the base machine . A plurality of joint booms are connected to the lower boom 4a in the longitudinal direction, and are assembled as an integral boom 4 as shown. The boom 4 is assembled in a tilted state, pulled up from the rear by the wire rope 11 from the winch 32 hanged through the gantry 5, and stands as shown in the figure. A support bracket 12 is provided at the upper end of the boom 4, and the connection bracket 13 fixed to the support bracket 12 in the upper part of the reader 6 is pin-connected at a point p. The leader 6 is attached so as to be suspended in a state where the leader upper portion 6a protrudes to a position higher than the tip of the boom 4 in this way. The leader 6 is supported at its lower end by an arm 7 extending forward from the upper swing body 3 in order to maintain an upright posture.

The reader 6 is divided in the longitudinal direction, and a plurality of reader members having a predetermined length are connected to each other as shown in the figure, and are configured as one. And the leader 6 comprised as a part of suspension type pile driving machine 10 has the guide pipe 14 on the right and left of the front (left side of drawing), and the auger 80 etc. which are working apparatuses are mounted | worn with it. The auger 80 is provided with a guide give 83 and is mounted so that the guide pipe 14 of the leader 6 can be slid from both left and right sides and can be moved up and down along the leader 6. Such an auger 80 is suspended by a wire rope 15 hanged through the top sheave 8 of the leader 6. The auger 80 is moved up and down along the leader 6 by unwinding or unwinding the wire rope 15 by the winch 31 provided in the upper swing body 3.

A casing, a drilling rod, and the like are connected to the auger 80 in the suspended pile driving machine 10 . The suspended pile driving machine 10 according to the present embodiment is an operation performed by connecting a casing 90 to an auger 80, and can withstand a tensile load when the casing 80 is pulled out. The bending moment that causes bending deformation is taken into consideration.
When the casing 90 is driven into the ground, the casing 90 is driven into the ground by a propulsive force generated by a spiral blade (not shown) provided at the lower end of the casing 90 or the weight of the auger 80 or the like. At this time, the reader 6 receives the rotational reaction force of the casing 90 that is rotationally press-fitted into the ground through the auger 80.

  On the other hand, when the casing 90 is pulled out, the casing 90 is reversely rotated from the auger 80, and is pulled upward by the wire rope 15 spanned through the top sheave 8 of the leader 6 together with the auger 80. Therefore, when the casing 90 is pulled out, the wire rope 15 fed from the upper swing body 3 is unwound from the rear of the leader 6 by the winch 31, and the auger 80 and the casing 90 are pulled up vertically in front of the leader 6. However, as described in the problem, recently, construction with a large-diameter casing 90 has been performed by a large auger 80, and the tensile load at the time of such casing drawing has increased. Accordingly, there is a problem that the bending moment acting along with this increases, and bending deformation occurs in the leader upper portion 6a.

In the suspended pile driving machine 10 , the wire rope 15 sent out from the winch 31 is sent to the rear sheave 25 of the top sheave 8 through the guide sheaves 21 and 22 behind the leader 6, and from there to the front sheave on the front side of the leader 6. 26 to the auger sheave 81 of the auger 80. When the casing 90 is pulled out, the tensile load of the wire rope 15 acts as a downward force before and after the top sheave 8 to generate a bending moment. The bending moment also acts on the leader 6, and in particular becomes a force that bends and deforms the leader upper portion 6a that is a free end above the point p that is pin-coupled to the tip of the boom 4. Therefore, the present embodiment aims to reduce the bending moment acting on the leader upper portion 6a.

  The top sheave 8 is provided at the upper end of the leader 6, and a plurality of front sheaves 26 and rear sheaves 25 are attached at positions protruding forward and backward of the leader 6. The wire rope 15 sent from the rear of the leader 6 is sent forward through the rear sheave 25 and is spanned a plurality of times between the front sheave 26 and the auger sheave 81 provided on the auger 80. That is, the auger 80 also has a plurality of auger sheaves 81 at its upper end, and the wire rope 15 is reciprocated up and down in front of the leader 6.

In this respect, the conventional suspended pile driving machine 100 shown in FIG. 5 is the same, but since the wire rope 110 is hooked behind the leader 106, the bending moment in the counterclockwise direction applied to the front is large. As a result, there is a problem that bending deformation occurs in the reader upper portion 106a. Here, FIG. 7 is a rope hanging view of such a conventional suspended pile driving machine 100.
5, in the suspended pile driving machine 100, the wire rope 110 fed from the winch 112 includes a guide sheave 121 at the tip of the boom 103, a guide sheave 122 at the back of the leader 106, and a rear sheave at the top sheave 108. 123 is passed over the auger sheave 81 of the auger 80 via the front sheave 124.

  In this case, as shown in FIG. 7, one wire rope 110 is hung up to the rear sheave 123 of the top sheave 108, whereas the front sheave 124 of the top sheave 108 and the auger sheave 81 of the auger 80 are reciprocated three times. It is a six-hang. Since the tensile load acting on the wire rope 110 is equal for each piece spanned between the sheaves, the load applied to the front of the top sheave 108 increases as the number of hooks in front of the reader 106 increases. Bending moment also increases.

On the other hand, in the suspended pile driving machine 10 of the present embodiment, as shown in the rope hanging diagram of FIG. For this purpose, as shown in FIG. 1, the sheave bracket 16 is formed integrally with the connecting bracket 13 of the reader 6, and a plurality of guide sheaves 22 are provided there. The guide sheave 22 corresponds to a balance sheave described in the claims.

Therefore, in this embodiment, as described above, the wire rope 15 sent out from the winch 31 is sent to the guide sheave 22 through the guide sheave 21 provided in the sheave bracket 17 at the rear end of the boom 4, The wire rope 15 is reciprocated between the guide sheave 22 and the rear sheave 25 of the top sheave 8. Thereafter, the wire rope 15 is sent to the front sheave 26, and is also reciprocated between the front sheave 26 and the auger sheave 81 of the auger 80. Therefore, a tensile load acts on the six wire ropes 15 in front of the leader 6, and a tensile load acts on the three wire ropes 15 in the rear of the leader 6, thereby reciprocating and hanging as described above. Since the tensile load between the passed sheaves is equal, the load applied to the rear of the leader 6 increases.

Here, FIGS. 8 and 9 illustrate the relationship between the force acting on the leader and the action on the leader in the suspension pile driver of the present embodiment (FIG. 8) and the conventional (FIG. 9). It is the figure (B) which showed the bending moment to do. As shown in FIG. 1A, leader axes G1 and G11 indicating the center lines of the leaders 6 and 106 are at positions separated by support axes B1 and B11 from a point p that is pin-coupled to the booms 4 and 103. The intersection point q between the leader axis G1, G11 and the support axis B1, B11. Horizontal axis lines Y1 and Y11 indicating lines connecting the front sheaves 26 and 124 of the top sheaves 8 and 108 and the rear sheaves 25 and 123 are intersections r with the leader axis lines G1 and G11. Here, it is assumed that the distances from the intersection point r to the front and rear loads F1, F2 or the acting points of the loads F11, F12 by the wire ropes 15 and 110 are equal.

Therefore, in the top sheave 8 of the present embodiment, the bending moment M1 around the intersection point r acts by the bending moment M1l counterclockwise due to the load F1 and the bending moment M1r clockwise due to the load F2. On the other hand, in the conventional top sheave 108, the bending moment M11 around the intersection point r acts by the bending moment M11l counterclockwise due to the load F11 and the bending moment M11r clockwise due to the load F12.
Further, a reaction force N by supporting the leaders 6 and 106 acts on a point p where the booms 4 and 103 and the leaders 6 and 106 are pin-coupled. Accordingly, bending moments M2 and M12 around the intersection point q act on the members of the support axes B1 and B11.

Therefore, as shown in FIG. 8B, the bending moment M1 acts on the leader upper portion 6a from the intersection point r to the intersection point q on the leader 6 of the present embodiment, and the leader 8 is applied to the arm 7 from the intersection point q. Up to the connected intersection s, the bending moment takes the maximum value M3 obtained by adding M2 to M1 at the intersection q, and decreases to zero at the intersection s at the lower end. Since the reaction force by the arm 7 is small in comparison with the whole, it is ignored.
On the other hand, also in the conventional reader 108, as shown in FIG. 9B, a bending moment M11 acts on the leader upper portion 106a from the intersection point r to the intersection point q, and the intersection point where the leader 108 is connected to the arm 107 from the intersection point q. Up to s, the bending moment takes the maximum value M13 obtained by adding M12 to M11 at the intersection point q, and decreases to zero at the intersection point s at the lower end. Similarly, the reaction force by the arm 107 is also ignored.

Although the maximum bending moments M3 and M13 act on the intersection point q between the intersection points qs, the leaders 6 and 106 are not easily deformed because they are supported by the connection brackets 13 and 113. However, the upper portion of the leader 6 a protruding from the tip of the boom 4, that is, between the intersection points qr is a free end, and this portion is deformed in construction using a large auger 80. Therefore, in order to prevent the deformation of the leader, it is necessary to reduce the bending moment between the intersection points qr. Therefore, in the suspended pile driving machine 10 of the present embodiment, the guide sheave 22 is provided so that the wire rope 15 can be reciprocated behind the leader 6. As a result, the number of hooks behind the leader, which was only one in the prior art, is three in the present embodiment, and the back tension behind the leader 6 can be increased.

Therefore, assuming that the length of the arm from the intersection r is L, in the suspended pile driving machine 10 of the present embodiment, M1 = M1l−M1r = F1 · L−F2 · L = F1 · L− (3/6) F1 · L = (1/2) F1 · L. Similarly, in the conventional suspended pile driving machine 10 , M11 = (5/6) F11 · L. Therefore, since F1 = F11, the suspension pile driving machine 10 can reduce the bending moment acting on the leader upper portion 6a by providing the guide sheave 22 and passing the wire rope 15 a plurality of times. . In the present embodiment, three is used, but the number can be further increased, and it is preferable that the same number is used before and after the reader 6. In the present embodiment, the number is three assuming that another wire rope is passed over the guide sheave 22. However, the bending moment acting on the reader 6 can be significantly reduced compared with the conventional example.

By the way, an upward tensile load acts on the guide sheaves 22 and 122 by the back tension. In the conventional suspended pile driving machine 100, since the guide sheave 122 is directly attached to the leader 106, it is considered that there is an influence due to the load acting on the leader 106. However, in the suspended pile driver 10 of the present embodiment, when a vertical line is drawn from the point p, the guide sheave 22 is received by the sheave bracket 16 because the guide sheave 22 is disposed at substantially the same position as the point p. The load due to the back tension is supported by the boom 4 and the influence on the leader 6 can be eliminated.
Further, in the present embodiment, the sheave bracket 16 is integrally formed on the connecting bracket 13 of the reader 6 and a plurality of guide sheaves 22 are provided, and the above effects can be realized by low-cost modification. it can.

Next, a second embodiment of the suspended pile driver of the present invention will be described. FIG. 2 is a view showing a suspended pile driving machine according to the second embodiment. As in the first embodiment, the suspended pile driver 20 is provided with the upper swing body 3 on the lower traveling body 2 that can be traveled by the crawler, and the leader 6 is suspended by the boom 4 that can be raised and lowered. It is attached. An auger 80 connected to a casing 90 is mounted on the leader 6 so as to be able to move up and down, and is suspended by a wire rope 15 from a winch 31 spanning each sheave. And in this embodiment, in order to suppress the bending moment to the leader 6, the following wire rope spanning structure is taken.

In this suspended pile driver 20 , the wire rope 15 fed out from the winch 31 is passed from the guide sheave 21 provided on the sheave bracket 17 at the rear of the tip of the boom 4 via the suspension sheave 27 for hanging the boom. It is sent to the top sheave 8. That is, the suspended pile driving machine 20 is provided with a plurality of hanging sheaves 27, and in this embodiment, the hanging sheave 27 is used. In the case of hanging and transporting by the boom 4 without attaching the leader 6, the wire rope 15 sent out from the winch 31 is suspended from the guide sheave 21 over the hanging sheave 27. However, in this case, in order to pass under the hanging sheave 27, a through hole (not shown) is formed so that the wire rope 15 passes through the tip of the boom.

The wire rope 15 is reciprocated between the suspended sheave 27 and the rear sheave 25 of the top sheave 8. In the present embodiment, the suspended sheave 27 corresponds to a balance sheave described in the claims.
Thereafter, the wire rope 15 is sent to the front sheave 26, and is reciprocated between the front sheave 26 and the auger sheave 81 of the auger 80. Therefore, also in this embodiment, as in the case of the rope hanging diagram of FIG. 6, the tensile load acts on the six wire ropes 15 in front of the leader 6, and the tensile load on the three wire ropes 15 behind the leader 6. It works.

Therefore, in the leader upper portion 6a of the leader 6 supported by the boom 4 via the connection bracket 13, the bending moment acting on the leader 6 can be greatly reduced by increasing the back tension by the wire rope 15. .
Then, an upward tensile load acts on the suspended sheave 27 due to the back tension, but in this embodiment, since the suspended sheave 27 provided in the boom 4 is used, the load due to the back tension is directly applied to the boom 4. Since it is supported, the influence on the reader 6 can be eliminated.
Furthermore, since the suspended sheave 27 provided in advance is used in the present embodiment, almost no modification to the boom 4 or the reader 6 is required, and the above-described effects can be realized easily and at low cost.

Next, a third embodiment of the suspended pile driver of the present invention will be described. FIG. 3 is a view showing a suspended pile driving machine according to a third embodiment. Similarly to the first embodiment, the suspended pile driving machine 30 is provided with the upper swing body 3 on the lower traveling body 2 that can travel by the crawler, and the leader 6 is suspended by the boom 4 that can be raised and lowered. Attached. An auger 80 connected to a casing 90 is mounted on the leader 6 so as to be able to move up and down, and is suspended by a wire rope 15 from a winch 31 spanning each sheave. And in this embodiment, in order to suppress the bending moment to the leader 6, the following wire rope spanning structure is taken.

In this suspended pile driving machine 30 , the wire rope 15 sent out from the winch 31 is sent directly to the top sheave 8 from the guide sheave 21 provided on the sheave bracket 17 at the rear of the tip of the boom 4. The suspended pile driving machine 30 is provided with a plurality of guide sheaves 21 with respect to the sheave bracket 17, and the wire rope 15 is reciprocated between the guide sheave 21 and the rear sheave 25. In the present embodiment, the guide sheave 21 corresponds to a balance sheave described in the claims.
The wire rope 15 is then sent to the front sheave 26, and is reciprocated between the front sheave 26 and the auger sheave 81 of the auger 80. Therefore, also in this embodiment, a tensile load acts on the six wire ropes 15 in front of the leader 6, and a tensile load acts on the three wire ropes 15 behind the leader 6.

  Therefore, in the leader upper portion 6a of the leader 6 supported by the boom 4 via the connection bracket 13, the bending moment acting on the leader 6 can be greatly reduced by increasing the back tension by the wire rope 15. . Then, an upward tensile load acts on the guide sheave 21 due to the back tension, but since the guide sheave 21 provided in the boom 4 is used in this embodiment, the boom 4 directly supports the load due to the back tension. Therefore, the influence on the reader 6 can be eliminated. Furthermore, in this embodiment, since the boom 4 and the reader 6 are not required to be modified, the above-described effects can be realized easily and at a low cost.

Next, a fourth embodiment of the suspended pile driver of the present invention will be described. FIG. 4 is a view showing a suspended pile driving machine according to a fourth embodiment. Similarly to the first embodiment, the suspended pile driving machine 40 is provided with the upper swing body 3 on the lower traveling body 2 that can be traveled by the crawler, and the leader 6 is suspended by the boom 4 that can be raised and lowered. Attached. An auger 80 connected to a casing 90 is mounted on the leader 6 so as to be able to move up and down, and is suspended by a wire rope 15 from a winch 31 spanning each sheave. And in this embodiment, in order to suppress the bending moment to the leader 6, the following wire rope spanning structure is taken.

In the suspended pile driver 40 , the wire rope 15 fed from the winch 31 is provided on the sheave bracket 18 at the tip of the boom 4 from the guide sheave 21 provided on the sheave bracket 17 at the rear of the tip of the boom 4. It is sent to the top sheave 8 through the guide sheave 28. That is, the sheave bracket 18 is fixed to the tip of the boom 4 in the suspended pile driving machine 40 , and a plurality of guide sheaves 28 are provided therein, and the wire rope 15 reciprocates between the guide sheave 28 and the rear sheave 25. And then passed over. In the present embodiment, the guide sheave 28 corresponds to a balance sheave described in the claims. Then, the wire rope 15 is sent to the front sheave 26 and is reciprocated between the auger sheave 81 and suspended.

Therefore, also in this embodiment, as in the case of the rope hanging diagram of FIG. 6, the tensile load acts on the six wire ropes 15 in front of the leader 6, and the tensile load on the three wire ropes 15 behind the leader 6. It works.
Therefore, in the leader upper portion 6a of the leader 6 supported by the boom 4 via the connection bracket 13, the bending moment acting on the leader 6 can be greatly reduced by increasing the back tension by the wire rope 15. .

Then, an upward tensile load acts on the guide sheave 28 due to the back tension. However, since the guide sheave 28 is disposed at substantially the same position as the point p by the sheave bracket 18 as in the first embodiment, the guide sheave 28 is guided. Since the load due to the back tension received by the sheave 22 is supported by the boom 4 via the point p, the influence on the leader 6 can be eliminated.
Further, in the present embodiment, the sheave bracket 18 is integrally formed on the boom 4 and a plurality of guide sheaves 28 are provided, and the above-described effects can be realized by low-cost modification.

  As mentioned above, although embodiment was described about the suspension type pile driving machine of this invention, all raise the back tension by increasing the number of wire ropes 15 behind the leader 6, and the leader upper part 6a of the leader 6 is made. The acting bending moment is reduced. Thereby, even when the large-sized auger 80 is used and the large-diameter casing 90 is pulled out, the work can be advanced without causing the reader 6 to bend.

In addition, although the 1st thru | or 4th embodiment was shown and demonstrated about the suspension type pile driving machine, this invention is not limited to such embodiment, A various change is possible in the range which does not deviate from the meaning.
For example, in the above-described embodiment, three wire ropes 15 are reciprocated between the guide sheave and the rear sheave, but five may be hung.

It is the figure which showed the suspension type pile driver of 1st Embodiment. It is the figure which showed the suspension type pile driver of 2nd Embodiment. It is the figure which showed the suspension type pile driver of 3rd Embodiment. It is the figure which showed the suspension type pile driver of 4th Embodiment. It is the figure which showed the conventional suspension type pile driver. It is a rope hanging figure in the suspension type pile driving machine of this embodiment. It is a rope hanging figure in the conventional hanging type pile driving machine. It is the figure which showed the relationship (A) of the force which acts on a leader, and the bending moment (B) which acts on a leader about the suspension type pile driving machine of 1st Embodiment. It is the figure which showed the relationship (A) of the force which acts on a leader, and the bending moment (B) which acts on a leader about the conventional suspension type pile driving machine.

2 Lower traveling body 3 Upper turning body 4 Boom 6 Leader 6a Leader upper part 8 Top sheave
10 Suspended pile driver 15 Wire rope 16 Sheave brackets 21 and 22 Guide sheave 25 Rear sheave 26 Front sheave 31 Winch 80 Auger 81 Auger sheave
90 casing

Claims (6)

The upper part of the boom of the base machine protrudes to a position higher than the tip of the boom, the leader is connected and supported, and the work device attached to the leader is unwound by unwinding and unwinding the wire rope sent from the winch of the base machine. In a suspended pile driver that moves up and down,
The leader top sheave is provided with a plurality of front sheaves and rear sheaves at the front and rear, and the leader or boom has a plurality of balance sheaves close to a connecting portion in which the leader is pin-coupled to the tip of the boom. The wire rope that is provided and passed from the rear of the leader to the front working device via the top sheave can be passed between the balance sheave and the rear sheave multiple times behind the leader. Suspended pile driver. In the suspended pile driver according to claim 1,
The leader has a connection bracket for pin coupling to the boom at a position away from the top sheave, a sheave bracket is fixed to the connection bracket, and a plurality of the balance sheaves are provided on the sheave bracket. A suspended pile driver characterized by being. In the suspended pile driver according to claim 1,
A first sheave bracket provided at the rear side of the boom and a second bracket provided at a position closer to the connecting bracket for pin-coupling the leader and the boom than the first sheave bracket at the boom tip portion . A suspended pile driver characterized in that a sheave bracket is fixed and a plurality of the balance sheaves are provided on the second sheave bracket. In the suspended pile driver according to claim 1,
A suspended pile driving machine characterized in that a suspension sheave provided at the tip of the boom for hanging a boom is the balance sheave. In the suspended pile driver according to claim 1,
A suspended pile driving machine characterized in that a guide sheave provided at the tip of the boom for guiding the wire rope to the top sheave is the balance sheave. A leader is connected to the boom of the base machine so that the upper part protrudes to a position higher than the tip of the boom, and the wire rope is used to lift and lower the working device attached to the leader with the wire rope sent out from the winch of the base machine. In a wire rope spanning method of spanning from the back of the reader to the front through the top sheave of the reader having a plurality of front sheaves and rear sheaves on the front and back,
In front of the leader, it is spanned a plurality of times between the front sheave and the sheave of the working device, and also in the back of the leader a plurality of times between the rear sheave and the balance sheave provided at the connecting portion between the leader and the boom. A wire rope spanning method for a suspended pile driver characterized by:

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