JPH046814B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a pile press-in/extraction device that presses in or pulls out piles by vertically moving an elevating head. By making it possible to tilt in the direction, it is possible to optimize the pile press-in or pull-out direction and reduce the section resistance that occurs at the connection with the existing pile, thereby making it possible to perform good pile press-in or pull-out. This invention relates to a pile press-in/extraction device.

(Prior Art) In various types of construction and civil engineering work, there is a pile driving method in which retaining walls, caissons, etc. are constructed using steel sheet piles such as flat plates and grooves. One of the pile driving methods is the pile press-in method, in which multiple piles are connected together at the joints of their side edges, placed side by side into the ground, and then pressed into the ground. A self-propelled pile press-in device is widely used, which is mounted and fixed by a mechanism or the like and moves by itself along a row of piles as the pile press-in progresses.

This self-propelled pile press-in device generally has a mast that vertically slides the lifting head on the upper surface of a front/back/left/right movable table or swivel table installed on a base equipped with a clamp that grips the upper end of the existing pile. It is configured by being fixed at the top. When press-fitting a pile, a pile such as a steel sheet pile is attached to the lifting head, and the pile is press-fitted into the ground adjacent to the existing pile.

However, when piles such as steel sheet piles are pressed into the ground using a pile press-in device with the above configuration, the newly press-fitted piles along with the existing piles cause sliding friction at the joints with the existing piles, causing sectioning at the joints. resistance increases. Particularly, this section resistance increases significantly when a pile having a planar shape asymmetrical to the pile row is press-fitted into the ground, such as a channel steel sheet pile. That is, the surface of the thin bottom (abdomen) of the pile receives a large circumferential resistance from the ground layer, causing a torsion moment in the pile and applying a large stress to the connection part, which further increases the section resistance.

Also, depending on the shape of the pile, the point of application of the press-in force and the center line of the press-in machine may be misaligned, so the press-in machine will tilt to the left or right depending on the shape of the pile, but if the press-in operation is performed with the press-in machine tilted, Sectional resistance increases because the line of action of the force does not act perpendicular to the pile.

If the section resistance increases in this way, the verticality during pile press-in may be lost and the pile may fall forward, or even laterally, the pile may fall sideways, or the press-in force may increase, making it difficult to press-in the pile. Ta.

Therefore, in order to avoid the influence of section resistance, conventionally a method has been adopted in which the pile press-in device is made to take an aggressive forward leaning position to ensure directionality during pile press-in. In other words, a filler is applied between the base of the conventional pile press-in device and the existing pile that the rearmost clamp faces, and the pile press-in device is tilted.
This causes the mast or the lifting head to take a forward leaning position.

Alternatively, when press-fitting a pile, the existing pile is gripped only by the frontmost clamp and the other clamps are released, and the pile being press-fitted is temporarily raised slightly. As a reaction to this pulling out, the rear part of the base lifts up, and all the clamps are gripped and fixed to the existing piles in this lifted state. In other words, if the pile is press-fitted while the rear of the base is lifted up, the same effect as when using the above-mentioned filler material can be expected.

Furthermore, a pile press-in/extraction machine has been proposed in which a chuck is attached to a mast so that it can rotate and move up and down, and the mast is pivoted on the end of a base so that the mast can only be tilted forward and backward using a forward and backward tilting means such as a cylinder. There is.

(Problems to be Solved by the Invention) However, the conventional pile press-in device described above has the following problems.

In other words, in the former pile press-in method using additives, it is not possible to set the tilting state of the mast of the equipment according to various conditions that change depending on the form of the pile, geological conditions, etc. It had drawbacks such as being troublesome and time-consuming to use.

With the latter floating method, stability on the existing pile could not be ensured due to phenomena such as the clamp gripping point shifting due to irregular press-fit resistance. Furthermore, including a pull-out process during press-in naturally reduces pile press-in efficiency.

Furthermore, even in a pile press-in/extraction machine whose mast is tiltable in the front-back direction, it is impossible to prevent the machine from falling sideways due to the circumferential resistance that the pile receives when press-fitting a channel steel sheet pile or the like.

As described above, with conventional pile press-in methods including the above method, it is not possible to take measures to optimize the press-in direction of piles in response to various conditions, especially in response to sideways collapse of press-in piles in the direction of pile row progression. Moreover, there were problems such as the handling work being difficult and troublesome.

In view of the above-mentioned conventional problems, the present invention reduces the section resistance that occurs at the connection part with existing piles when piles such as steel sheet piles are press-fitted into the ground, and the direction angle of the pile press-in can be changed from front to back, left and right. It is an object of the present invention to provide a pile press-in/extraction device that can perform good pile press-in at the most appropriate angle in the direction of .

(Means for Solving the Problems) In order to achieve the above object, the pile press-in/extraction device of the present invention has a movable platform that can be moved back and forth and rotated or moved left and right on a base that has a clamp at the bottom that grips existing piles. In a pile press-in/extraction device, a mast is erected on this moving platform, and a vertically movable lifting head for press-fitting or pulling out piles is provided on the mast. a back-and-forth tilting means for rotatably attaching one shaft to the movable table and rotatably attaching the mast to the other axis of the cross shaft, and tilting the mast in the front and rear directions about the cross shaft; It is characterized by separately providing a left-right tilting means for tilting the mast in the left-right direction about the mast.

(Function) While the upper end of the existing pile row is gripped with a clamp to fix the entire device, the lifting head is positioned adjacent to the pile at the tip of the existing pile row so that the pile can be press-fitted. At this time, the mast, which can tilt in all directions on the movable platform, is tilted forward, taking into consideration the section resistance at the joint between the pile to be press-fitted and the existing pile. In other words, the mast is tilted to an optimal position by combining the front and rear inclinations of the mast through two-axis displacement in the front, rear, left, and right directions. This avoids the pile being subjected to irregular stress due to section resistance during press-fitting, and enables good pile press-fit. In addition, if the pile has a non-linear cross section such as a channel steel sheet pile, the mast on the movable platform is tilted to either the left or right side to ensure a balance of stress received when the pile is press-fitted.

The forward tilting of the mast is achieved by driving the forward and backward tilting means to rotate one of the cross shafts, thereby tilting the mast attached to the other cross shaft in the direction of rotation. Further, the mast is tilted in the left-right direction by driving the left-right tilting means to rotate the mast with respect to the other axis of the cross axis. In this case, since the longitudinal tilting means and the horizontal tilting means are provided separately, their respective drives are not hindered. Therefore, the pile press-in angle can be arbitrarily adjusted by alternately tilting in the front-rear direction and tilting in the left-right direction. Furthermore, since the mast is tilted forward and backward and left and right around the cross axis, the centers of these tilts coincide, making it possible to perform accurate tilting in both directions with simple control.

In this way, the mast is tilted in accordance with the stress applied to the pile that is press-fitted into the ground, and the direction in which the pile is press-fitted by the lifting head is appropriately set. In addition, it is possible to change the direction and degree of inclination of the mast in response to the section resistance and stress that change sequentially during pile press-in, making it possible to respond to all pile press-in conditions.

(Example) Figs. 1 to 4 show a pile press-in/extraction device according to an embodiment of the present invention, in which Fig. 1 is a partially sectional side view, Fig. 2 is an explanatory perspective view of the mast tilting mechanism, and Fig. 3 and 4 are a front view and a side view showing the mast in a tilted state.

In the drawings, 1 is a base. This base 1 has a plurality of clamps 2, 2, . . ., which grip the upper ends of existing piles P, P, .

Mounted on the top surface of the base 1 is a movable table 3 consisting of a back-and-forth movable table 3a that can be slid back and forth, a left-right movable table 3b that can be slid left and right, and a turning table 3c that can be turned. This moving platform 3
The structure may be of any type found in conventional devices of this type, and one of the tables making up the movable table 3 may be omitted, and the vertical position order can be set as appropriate. It is.

A mast 4 is tiltable in all directions on the movable table 3. As shown in FIG. 2, this mast 4 is attached to the movable base 3 via a cross shaft 8 attached to the movable base 3. The cross shaft 8 has two orthogonal shafts 8a and 8b, and one shaft 8a is rotatably supported by bearings 5, 5 provided on the upper surface of the turning table 3c of the moving table 3. Since this one shaft 8a is provided in a direction perpendicular to the front-rear direction of the mast 4, that is, aligned with the left-right direction of the mast 4, when the one shaft 8a rotates, the mast 4 cannot tilt in the front-rear direction. can.

The other axis 8b of the cross axis 8 is connected to this one axis 8a.
It is formed integrally with one shaft 8a so as to coincide with the direction orthogonal to the mast 4, that is, the front-rear direction of the mast 4. The mast 4 has a bearing 7 fixed to an internal beam 6,
7, and the other shaft 8b is rotatably inserted into the bearings 7, 7, thereby being rotatably supported by the other shaft 8b of the cross shaft 8. Therefore, the mast 4 can tilt in the left-right direction by rotating around this other shaft 8b.

Hydraulic pistons 10 and 9 are provided as tilting means for tilting the mast 4 in the front-rear direction and in the left-right direction. The hydraulic piston 10 is connected to the front of the mast 4 and the turning table 3c.
Both ends are connected to the mast 4, and the expansion and contraction of the mast 4 acts as a longitudinal tilting means for tilting the mast 4 in the longitudinal direction. On the other hand, the hydraulic piston 9 has both ends connected to the cross shaft 8 and one side surface of the mast 4, and functions as a left-right tilting means for tilting the mast 4 in the left-right direction by its expansion and contraction. These hydraulic pistons 9 and 10 are provided separately, and each can be driven independently.

The rods at both ends of each of the hydraulic pistons 9 are pivotally supported and expand and contract by hydraulic drive, thereby causing the mast 4 to tilt laterally to the left and right about the midpoint of the cross shaft 8 (see Fig. 3). ). On the other hand, hydraulic piston 1
The rods at both ends of the rotary shaft 3c are also pivotally supported, but the rods pivotally supported on the turning table 3c must be configured as a universal joint to enable rotation in all directions. By driving this hydraulic piston 10 to expand and contract, the mast 4
is allowed to tilt back and forth (Figure 4). Therefore, by independently controlling both hydraulic pistons 9 and 10, the mast 4 can be tilted in any direction and angle.

Moreover, the mast 4 is tilted in the front-rear direction and in the left-right direction around the cross shaft 8, and the angle of each tilting movement can be adjusted with the cross shaft 8 as a reference. For this reason, it is easy to control the front-rear and left-right tilting, and moreover, it is possible to perform accurate adjustments. Therefore, for example, the mast 4 can be tilted so that the phase between the grip at the upper end of the existing pile and the grip at the lower end of the newly press-fitted pile is minimized, and thereby the existing pile is tilted in the longitudinal direction of the pile row. There is an advantage that the press-fit pile can be easily press-fitted in any condition, even if the pile row is tilted in the left-right direction.

Reference numeral 11 denotes an elevating head that can slide up and down along the front part of the mast 4. This lifting head 11 is a pile
It has a chuck 12 for clamping and fixing P'. The structure of these elevating head 11 and chuck 12 is not particularly limited in the present invention.

In this embodiment, the movable table 3
However, the present invention is not limited to this, and the movable table 3 can also be configured by a combination of a back-and-forth moving table 3a and a left-right moving table 3b, or a combination of a back-and-forth moving table 3a and a turning table 3c.

The operation of the above embodiment will be explained below.

With the base 1 horizontally placed and fixed on the existing piles P, P... by the clamps 2, 2..., the back and forth moving table 3a, the left and right moving table 3b, and the turning table 3c are appropriately driven and controlled to move the existing pile P. , P . stake
Since P' is connected to the frontmost pile of the existing piles at the connecting part and press-fitted into the ground, it is necessary to set the direction of pile press-in, taking into account the section resistance during press-fit.

Therefore, the hydraulic pistons 9 and 10 are driven to change the designated position of the mast 4 with respect to the turning table 3c around the cross axis 8. In other words, the mast 4 is tilted with respect to the base 1 to the movable table 3 by controlling the inclination in the front, rear, right, and left directions using the cross shaft 8 as a fulcrum. Although the direction and degree of inclination cannot be specified depending on the type of pile and the geology, even if the mast 4 is slightly tilted forward, the influence of stress due to section resistance can be reliably reduced.

(Effects of the Invention) As is clear from the above, according to the present invention, the mast having the lifting head is provided so as to be tiltable in all directions around the cross axis, so that the connecting part with the existing pile is connected when the pile is press-fitted. The direction in which the piles clamped and fixed to the lifting head can be press-fitted can be optimized by taking into account the influence of section resistance, and in particular, piles can be press-fitted favorably as the piles can be counterbalanced to the left and right in the direction in which the pile row is traveling. Since the mast tilting mechanism consists of a cross shaft and a hydraulic piston, the mast can be tilted smoothly and reliably, and tilting control can be easily executed.The simple configuration also simplifies maintenance management. , can be easily applied to conventional device manufacturing processes.

[Brief explanation of drawings]

The drawings show embodiments of the present invention.
2 is a partially sectional side view of the pile press-in device, FIG. 2 is an explanatory perspective view of the mast tilting mechanism, FIG. 3 is a front view showing the mast in a tilted state, and FIG. 4 is a side view of the same. 1...base, 2...clamp, 3...movement stand,
4...Mast, 8...Cross shaft, 9, 10...Hydraulic piston, 11...Elevating head, P...Existing pile.

Claims (1)

[Scope of Claims] 1. A movable platform is attached to a base having a clamp at the bottom thereof that grips existing piles so as to be movable back and forth, turnable, or movable left and right, a mast is erected on this movable platform, and the piles are attached to the mast. In a pile press-in/extraction device that is provided with a vertically movable elevating head for press-fitting or pulling out a pile, one axis of a cross shaft having two orthogonal axes is rotatably attached to the movable table, and the cross shaft is The mast is rotatably attached to the other shaft, and a longitudinal tilting means for tilting the mast in the front-back direction about the cross axis and a left-right tilting means for tilting the mast in the left-right direction about the cross axis are separately provided. A pile press-in/extraction device.