JPH0348263Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a pile press-in machine equipped with a crane that is used when press-fitting long sheet piles at construction sites, civil engineering sites, etc.

[Conventional technology]

Generally, when pressing long sheet piles into the ground, a pile press-in machine with a leader that is held by a crane is used. At this time, in the conventional pile press-in machine with a leader, the lower end of the leader held by the crane is fixed to the central upper surface of the lower end frame, and the screw that excavates the ground is an auger excavation mechanism that moves up and down using the leader as a support. It was mounted so as to be able to move integrally with the lower end of the lower frame, and was housed in the inner diameter of a chucking mechanism provided at the front of the lower frame in a manner parallel to the leader. As described above, the conventional pile press-in machine is configured such that the section for fixing the lower end of the leader and the chucking mechanism for supporting the up-and-down operation of the screw are located at different locations.

[Problem that the invention attempts to solve]

According to the above, when the conventional pile press-in machine press-fits sheet piles, (1) the lower end of the leader is fixed to the upper center surface of the lower frame, so when the pile press-in machine is moved, the pile press-in is performed by operating a crane; Because the machine, leader, and auger excavation mechanism had to be lifted and moved, the crane used had to be larger in capacity, resulting in higher costs.

(2) Also, since the section that fixes the lower end of the leader and the chucking mechanism that moves the screw up and down are located in different locations, it is necessary to align the chucking mechanism and screw again (centering operation) after moving the pile press-in machine. Due to this, it was not possible to improve work efficiency.

(3) Furthermore, since the leader and screw are placed in different positions, if the ground is hard, the screw in the soil will cause a change in the digging angle, significantly reducing the accuracy of construction.

There was a problem.

[Means for solving problems]

This idea eliminates the leader and places the auger digging mechanism suspended from the crane.The upper end of the casing, in which the screw is concentrically housed, is attached directly below the center of the auger digging mechanism, and the lower end is attached to the upper frame. The casing is removably inserted into the chucking mechanism installed at the front, and the casing is pressed into the ground together with the sheet pile when the screw is digging.

[Effect]

Due to the above, the auger excavation mechanism is suspended from the crane during the press-fitting operation of the sheet pile, and the lower end of the casing, whose upper end is attached to the auger excavation mechanism, is removably inserted into the chucking mechanism. The upright position of the pile can be easily and reliably maintained, and even if the ground is somewhat hard, it is possible to prevent scandals such as the screw changing the digging angle in the soil, and the casing can be checked after the sheet pile is press-fitted. Since the pile press-in machine can be separated from the mechanism and moved independently, work efficiency can be greatly improved.

〔Example〕

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

The pile press-in machine according to this invention eliminates a conventional leader and is configured so that an auger digging mechanism D is suspended by a crawler crane C, as shown in FIG. Directly below the core of this auger excavation mechanism D, the upper end of a casing 3, in which a screw 4 is concentrically housed, is connected so that the screw 4 can rotate integrally with the auger excavation mechanism D. They are attached in one piece by screwing bolts etc. under the same conditions. The lower end of the casing 3 is removably fitted into a chucking mechanism B of a pile press-in machine A, which will be described below.

The pile press-in machine A that removably inserts the lower end of the casing 3 is constructed as follows. That is, as shown in FIGS. 1 to 3, this pile press-in machine A has a plurality of reaction force chucks 1a that grip the sheet pile P that has been driven into the bottom of the machine base 1. An upper frame 2 is placed directly above the machine base 1 so as to be slidable in the front-rear and left-right directions. A chucking mechanism B described below is provided at the front position of the upper frame 2 according to this aspect.

As shown in FIGS. 2 to 4, this chucking mechanism B has a vertical cylindrical outer shell, into which the lower end of the casing 3 and the sheet pile P can be inserted. A screw insertion portion 3a formed by a convex-shaped air zone extends vertically through the screw insertion portion 3a. And the screw insertion part 3
When the lower end of the casing 3 described above is removably inserted into the center position of the insertion portion 3a, a seat pile formed at one end of the outer circumference of the casing 3 is used for gripping a sheet pile formed at one end of the outer circumference of the casing 3. A push tooth 5b corresponding to the receiving tooth 3b is arranged so as to be movable back and forth. That is, as shown in FIG. 4 with a partial cross section, the push tooth 5b is formed by extending the piston rod 5a of the chucking cylinder 5, which is disposed at the lower lateral end position of the chucking mechanism B, in the direct upward direction. It is formed at an upper inner position of the piston rod 5a. Therefore, when the sheet pile P is inserted penetratingly into the screw insertion portion 3a between the casing 3 and the piston rod 5a, the piston rod 5a is pushed out toward the casing 3 by the operation of the chucking cylinder 5.
It is configured so that the sheet pile P can be gripped by both the receiving teeth 3b and the pushing teeth 5b.

The chucking mechanism B formed in the above manner is attached to the outer shell of the press-fit cylinder 6 which is vertically installed on the upper frame 2 at the adjacent position so as to be able to move up and down integrally. In this case, the press-fit cylinder 6 has its piston rod 6a attached to the front end side arm 2a of the upper frame 2 with the pin 1.
0, the pin 10 is erected so as to be able to swing around the pin 10 as a fulcrum. A press-fit cylinder 6 is arranged in this piston rod 6a so that it can be slid up and down by fitting the arm portion 6b into the slide longitudinal groove 2b on both sides of the upper front end of the upper frame 2 by operating the cylinder itself. ing.

In addition, when the pile press-in machine A moves to the rear side of the upper frame 2 using the sheet pile P as a support,
A reverse reaction cylinder 8 with a reaction chuck 8a, which serves as a support for the upper frame 2, is installed in a vertical arrangement. Furthermore, the inner guide 7 shown in FIG. 5 does not require digging with the screw 4 when the ground E into which the sheet pile P is driven is soft, so the inner guide 7 shown in FIG. It is fixed concentrically in position by tightening a bolt 9 screwed through a bolt hole in the arcuate surface 7a. Also in this case, one end of the outer periphery of the inner guide 7 has a receiving tooth 7b having the same shape as the receiving tooth 3b of the casing 3.
is formed.

When press-fitting the sheet pile P into the desired ground E using the pile press-in machine A with the above configuration,
As shown in FIG. 1, the auger digging mechanism D is suspended by a crawler crane C, and the lower end of the casing 3 in which the screw 4 is housed is connected to the chucking mechanism B.
It is inserted into the screw insertion part 3a and fixed.

In this state, after inserting the sheet pile P into the U-shaped air space of the screw insertion part 3a opened by operating the chucking cylinder 5 as shown in Fig. 4, and moving the piston rod 5a inward, the sheet pile P is P is the receiving tooth 3b of the casing 3 and the pushing tooth 5 of the chucking cylinder 5.
b allows for a stronger grip. In this state, by lowering the press-fit cylinder 6 by operating the press-fit cylinder 6 while driving the auger digging mechanism D, the chucking mechanism B, which is integrated with the outer shell of the press-fit cylinder 6, is also moved vertically at the same time. The lower end of the casing 3 is fitted into this chucking mechanism B in order to lower the casing 3.
will also descend in one piece. At this time, since the screw 4 is rotating in the spiral direction by the drive of the auger excavation mechanism D, the casing 3 and sheet pile P are simultaneously press-fitted into the excavated vertical hole while excavating the ground E with this screw 4. be able to.

After the gripping mode by the push teeth 5b of a is released and the press-fit cylinder 6 is returned to the initial upper air position, the sheet pile P is again pushed by the receiving teeth 3b of the casing 3 and the push teeth 5b of the piston rod 5a.
By pressing down the press-fitting cylinder 6 while holding the sheet pile P, the sheet pile P can be press-fitted in parallel with excavation.

In addition, when press-fitting the sheet piles P one after another as described above, these sheet piles P must be clamped by each reaction chuck 1a formed at the bottom of the machine base 1 as shown in Fig. 1. Thus, a stable fixing mode of the pile press-in machine A can be obtained. In addition, when the pile press-in machine A is moved forward after each sheet pile P is press-fitted, the reaction force chuck 8a of the reverse reaction force cylinder 8 is used to clamp the rear sheet pile P. All reaction chucks 1a are opened,
To smoothly and easily advance a pile press-in machine A by moving a machine platform 1 forward by one stroke and then clamping each sheet pile P at the advanced position again by a reaction chuck 1a for each position. I can do it.

In the above implementation, the press-in operation of the sheet pile P was explained, but the pile press-in machine A according to this invention is
Not only the press-fitting operation described above, but also the pulling-out operation of the sheet pile P press-fitted into the ground E can be performed by reversing the order of the operations described above.

Next, the ground E to be press-fitted is soft and the auger excavation mechanism D
If this is not necessary, remove the casing 3 from the position of the chucking mechanism B by inserting the screw 4, and then insert it into this position on one side of the blind plate as shown in Figure 5. Tightening of the bolt 9, which is inserted through the bolt hole of the circular arc surface 7a, with an inner guide 7 having a protruding circular arc surface 7a with a bolt hole and a receiving tooth 7b having the same shape as the receiving tooth 3b of the casing 3 described above on the other side. By attaching the sheet pile P removably with the support teeth 7b and the pushing teeth 5b on the chuck cylinder 5 side, the sheet pile P can be gripped by the receiving teeth 7b and the push teeth 5b on the chuck cylinder 5 side, and the press fit cylinder 6 can be pressed down without the need for excavating the screw 4. can be press-fitted.

[Effect of idea]

As explained above, this idea eliminates the leader and places the auger excavation mechanism D suspended from the crane, and the upper end of the casing, in which the screw is concentrically housed, is attached directly below the center of the auger excavation mechanism D. In addition, the lower end is removably inserted into the chucking mechanism installed at the front of the upper frame, and this casing is pressed into the ground together with the sheet pile when the screw excavates. It has a positive effect.

(1) Since the conventional leader is eliminated, there is no need to suspend and move the pile press-in machine and auger excavation mechanism together when moving the pile press-in machine, which reduces the capacity of the crane used. Since it is small in size, it is possible to reduce costs.

(2) In addition, the casing, which serves as the support for the screw connected to the auger excavation mechanism, is formed as a single unit concentrically with the screw, making it extremely easy to align the position after moving the pile press-in machine, which improves work efficiency. You can improve your performance.

(3) Furthermore, because the casing and screw are formed as a concentric unit, the screw does not change the digging angle in the soil even when the ground is hard, so it is possible to improve the accuracy of construction. There are effects such as being able to do it.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a pile press-in machine with a crane according to this invention, Fig. 2 is a plan view of the same pile press-in machine, Fig. 3 is a side view of the same, and Fig. 4 shows the chucking part using the same auger. FIG. 5 is a partially cross-sectional plan view showing the chucking portion without an auger. 2... Upper frame, 3... Casing, 3a
... Screw insertion part, 3b, 7b ... Receptacle tooth,
4...screw, 5b...push tooth, 6...press-fit cylinder, A...pile press-in machine, B...chucking mechanism, D...auger digging mechanism, P...sheet pile.

Claims (1)

[Scope of utility model registration request] The main body of the pile press-in machine is detachably attached to the existing sheet pile using a reaction chuck, the auger digging mechanism is suspended from a crane placed outside the area of the existing sheet pile, and a screw is concentrically placed directly below the center of the auger digging mechanism. At the same time, the lower end of the casing is removably inserted into the chucking mechanism installed in the front part of the upper frame, and the casing according to this embodiment is inserted into the ground together with the sheet pile when excavating with the screw. A pile press-in machine characterized by being press-fitted into a pile.