JPH0640038U - Clamping device for steel pipe pile - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to prevent the holding claws from rotating when sandwiching steel pipe piles, to sandwich steel pipe piles of any diameter, and to sandwich piles other than steel pipe piles. [Structure] A holding claw 22 that abuts an inner surface of a steel pipe pile P is a fixed side, and a holding claw 21 that abuts an outer surface of a steel pipe pile P is a movable side, and the movable holding claw 21 is connected to a clamp cylinder 23. The tip surface of the fixed-side gripping claw 22 is formed into a curved surface shape to secure a contact area with the steel pipe pile P. The tip end surface of the movable holding claw 21 is a linear flat surface, and the holding claw 2 when sandwiched is provided.
Prevent rotation of 1. Since the movable holding claw 21 has a flat surface, it is possible to hold other piles such as a steel sheet pile.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a clamp device mounted on a pile press-fitting / pulling machine to generate a reaction force at the time of press-fitting / pulling out a steel pipe pile.

[0002]

[Prior art]

 The pile press-in / extractor lowers the chuck while holding the pile to press the pile into the ground, but is equipped with a clamp device to receive the reaction force from the ground during the press-fitting. This clamp device clamps the existing pile to fix the pile press-in / pull-out machine on the existing pile. In the case of a steel sheet pile-shaped pile, the flat surface of the steel sheet pile can be sandwiched by forming the tip surface of the clamping claw of the clamp device into a flat surface, but in the case of a steel pipe pile with a circular cross section, You cannot use a flat claw.

FIG. 5 and FIG. 6 show a conventional clamp device for sandwiching such a steel pipe pile P. The clamp device 50 is configured by suspending clamps 52, 52 from a saddle 51 of a pile press-fitting / pulling machine. The clamps 52, 52 are horizontally slid by the adjusting cylinders 53, 53 provided in the saddle 51 in the horizontal direction to adjust the distance to the steel pipe pile P. Further, each clamp 52 is provided with a pair of sandwiching claws 54 and 55 that sandwich the inner and outer surfaces of the steel pipe pile P. The tip surfaces of the holding claws 54 and 55 of each clamp 52 are formed into a curved surface shape that matches the curvature of the steel pipe pile P. Of the pair of holding claws, the holding claw 54 located on the outer surface side of the steel pipe pile P is the fixed side, and the holding claw 55 located on the inner surface side of the steel pipe pile P is the movable side. The movable holding claw 55 is connected to a clamp cylinder 56, and is pressed against the inner surface of the steel pipe pile P by the operation of the cylinder 56. Thereby, the steel pipe pile P is clamped by the pair of holding claws 54 and 55.

In the clamp device 50 having the above-described structure, when the gripping claw 55 on the movable side comes into contact with the steel pipe pile P, the gripping of the steel pipe pile P becomes unstable when the gripping claw 55 rotates, so that the gripping claw becomes unstable. It is necessary to prevent the rotation of 55. Therefore, in the illustrated example, two clamp cylinders 56 are connected to each holding claw 55 to prevent rotation. For the same purpose, the holding claw 55 is also prevented from rotating by engaging a key and a key groove (not shown).

[0005]

[Problems to be solved by the device]

 In the conventional clamp device, in order to prevent the rotation of the gripping claw, two clamp cylinders 56 are required for one gripping claw 55, so that the number of parts is large and the structure is complicated. Further, a hydraulic circuit for operating the two clamp cylinders 56 in synchronism is necessary, and it is difficult to control the operation. This is also the case when the rotation of the gripping claw is prevented by the key and the key groove, and the structure is complicated and assembly is troublesome. Further, the conventional clamp device can only clamp steel pipe piles, and cannot be used for clamping other flat piles such as steel sheet piles, and has a problem of poor versatility. The present invention has been made in consideration of the above circumstances, and it is possible to prevent the rotation of the gripping claws even with a single clamp cylinder, simplify the structure and control, and clamp other piles other than steel pipe piles. An object of the present invention is to provide a simple clamp device.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a clamping device that includes at least a pair of holding claws for sandwiching the inner and outer surfaces of an existing steel pipe pile, and obtains a reaction force from the ground when the steel pipe pile is press-fitted or pulled out. , A fixed side that contacts the inner surface of the steel pipe pile and a movable side that is connected to the clamp cylinder and presses the outer surface of the steel pipe pile, and the contact surface of the holding claw on the fixed side has a curved surface that matches the curvature of the steel pipe pile. It is characterized in that the pressing surface of the holding claw on the movable side is formed as a linear flat surface.

[0007]

[Action]

 When the steel pipe pile is pressed, the movable holding claw whose pressing surface is a flat surface is not affected by the curved surface of the steel pipe pile and does not rotate during pressing. Therefore, even with a single clamp cylinder, it is possible to reliably clamp steel pipe piles of any diameter. Moreover, since the pressing surface of the holding claw, which is a flat surface, also makes good contact with the flat portion, it is possible to clamp other piles such as steel sheet piles.

[0008]

【Example】

 FIG. 1 shows the overall construction of a pile press-fitting / pulling machine 1 to which an embodiment of the present invention is applied. The pile press-fitting / extracting machine 1 includes a plurality of clamps 2 for sandwiching each of a plurality of existing steel pipe piles P, and a chuck 3 for holding a new steel pipe pile PO and moving up and down. Then, while moving on the existing steel pipe pile P, a new steel pipe pile PO is press-fitted to construct a pile row. Each clamp 2 hangs down from a saddle 4, and a slide base 5 which is relatively movable in the pile row direction by at least one pitch of the existing steel pipe pile P is mounted on the saddle 4, and the mast is mounted on the slide base 5. 6 are erected. A guide rail 7 is provided in the vertical direction on the front side of the mast 6, and an elevating body 8 to which the chuck 3 is attached is slidably attached to the guide rail 7.

As shown in FIGS. 2 and 3, each clamp 2 is configured by having a clamp member 20 that holds one steel pipe pile P at each of two positions. These clamp members 20 are slid horizontally by the adjusting cylinders 10 and 10 provided horizontally on the saddle 4 to adjust the distance to the steel pipe pile P. Each clamp member 20 clamps the steel pipe pile P from its inner and outer surfaces, and therefore each clamp member 20 has a pair of gripping claws 21 and 22, respectively. Of the pair of holding claws, one holding claw 22 enters the inside of the steel pipe pile P and contacts the inner surface of the steel pipe pile P. One of the holding claws 22 is on the fixed side, and the tip end surface that abuts the inner surface of the steel pipe pile P is formed into a curved shape that matches the curvature of the steel pipe pile P.

On the other hand, the other holding claw 21 is located outside the steel pipe pile P and presses the outer surface of the steel pipe pile P. The holding claw 21 is connected to a clamp cylinder 23 provided on the clamp member 20, and is a movable side that moves in a direction toward or away from the steel pipe pile P by the operation of the clamp cylinder 23. The tip end surface of the movable-side holding claw 21 that presses the outer surface of the steel pipe pile P is formed into a flat surface that extends linearly along the tangential direction of the steel pipe pile P.

In the operation of the present embodiment configured as described above, when the clamp cylinder 23 is extended and operated, the movable side holding claw 21 advances and the flat tip end surface presses the outer surface of the steel pipe pile P. As a result, the steel pipe pile P can be sandwiched between the fixed side holding claws 22 and the reaction force when the new steel pipe pile PO is press-fitted by the chuck 3 can be received. In this pinching, the holding pin 21 on the movable side has a pressing action in a state where the pinching claw 22 on the fixed side is in contact with the steel pipe pile P with a large contact area, so that a predetermined pinching force can be obtained.

Further, since the movable-side holding claw 21 presses along the tangential direction of the steel pipe pile P, it is not affected by the curved surface of the steel pipe pile P. For this reason, the clamp cylinder 23 and the holding claw 21 can reliably press the steel pipe pile P without rotating. Therefore, the movable holding claw 21 can be operated by the single clamp cylinder 23. Further, it is not necessary to provide a key and a key groove for preventing rotation, the number of parts is reduced, the structure is simple, and the control is easy.

FIG. 4 shows a state in which the steel sheet pile 30 is clamped according to this embodiment. The sandwiching of the steel sheet pile 30 is carried out by bringing the claws 21, 22 into contact with the web W in the flat portion, but since the tip end surface of the movable-side claw 21 is a flat surface, the contact with the web W is made. The area can be increased. For this reason, piles other than steel pipe piles having flat parts such as steel sheet piles can be clamped, and versatility is expanded.

[0014]

[Effect of device]

 According to the present invention, since the movable-side holding claw has a linear flat surface, the movable-side holding claw does not rotate, the rotation prevention structure is not required, and the structure and control can be simplified. It is not necessary to manufacture claws according to the diameter of the pile, and it is also possible to clamp piles other than steel pipe piles.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a pile press-fitting / pulling machine to which an embodiment of the present invention is applied.

FIG. 2 is a side sectional view of an embodiment of the present invention.

FIG. 3 is a plan sectional view of an embodiment of the present invention.

FIG. 4 is a plan sectional view showing a sandwiched state of a steel sheet pile.

FIG. 5 is a side sectional view of a conventional device.

FIG. 6 is a plan sectional view of a conventional device.

[Explanation of symbols]

 2 Clamp 20 Clamp body 21 Clamping claw on the movable side 22 Clamping claw on the fixed side 23 Clamp cylinder P Steel pipe pile

Claims (1)

[Scope of utility model registration request] 1. A clamp device comprising at least a pair of holding claws for sandwiching the inner and outer surfaces of an existing steel pipe pile, and obtaining a reaction force from the ground when the steel pipe pile is pressed in or pulled out, wherein the pair of holding claws is an inner surface of the steel pipe pile. A fixed side that abuts against the clamp cylinder and a movable side that is connected to the clamp cylinder and presses the outer surface of the steel pipe pile.The contact surface of the holding claw on the fixed side is formed into a curved surface that matches the curvature of the steel pipe pile and is movable. Clamping device for steel pipe pile in which the pressing surface of the holding claw on the side is formed into a straight flat surface.