JP3605406B1 - Clamping device for steel pipe pile - Google Patents

Abstract

Disclosed is a method for dispersing forces in three directions by extending a single clamp cylinder to prevent deformation of the steel pipe pile without being affected by the thickness of the steel pipe pile and the diameter of the steel pipe pile. An object of the present invention is to provide a clamp device for a steel pipe pile in which the deformation of the pile in the diameter direction is reduced.
In a steel pipe pile press-in and pull-out machine (1) having a steel pipe pile clamping device (3) disposed below, it is divided into two parts by way of an equalizer (16) at the other end of a clamp cylinder (15) integrated with a fixed claw (12). The movable pawls 13a and 13b are attached to constitute the steel pipe pile clamping device 3, and the fixed pawl 12 and the two movable pawls 13a and 13b are inscribed in the steel pipe pile by the extension of the clamp cylinder 15, and the steel pipe pile is placed from the inside. It has a configuration of a clamp device that can take a reaction force by clamping. The two movable claws 13a and 13b are independently rotatable in the horizontal direction about the pin 14 as an axis.
[Selection diagram] FIG.

Description

  The present invention relates to a steel pipe pile clamping device which is fixed on an existing steel pipe pile and which can press-fit or pull out a new steel pipe pile into the ground based on the reaction force of the existing steel pipe pile.

  Conventionally, in various civil engineering foundation works, steel pipe piles, such as steel pipe single piles and steel pipe sheet piles, have a large bearing capacity and are economical, so besides permanent structures, revetment work, mountain retaining work, and deadline work. It is widely used as a support pile for temporary construction work. For press-fitting and pulling out these steel pipe piles into the ground, for example, in places where there is no restriction on the sky, construction methods such as vibro hammer, diesel hammer or Nakahori type, and static load type steel pipe pile press-in machines are used. At the places, static load type steel pipe pile press-in and pull-out machines are mainly used.

  Focusing on this static load type steel pipe pile press-in / draw-out machine, a slide base is mounted on a pedestal, and a press-in / pull-out cylinder is attached to a support arm standing upright on the slide base, and the lifting / lowering body is moved up and down by the press-in / pull-out cylinder. The elevating body is provided with a pile gripping device that is rotatable about a vertical axis, and a plurality of clamp devices are provided below the pedestal and have claws that are inscribed in the existing steel pipe pile and project outward from the inner surface. This clamp device is slidably mounted in the lower part of the pedestal in the front-rear direction, and is slidably mounted in the lower part of the press-in / draw-out cylinder in the left-right direction, and clamps the existing pile by the clamp device. It is taking a reaction force by doing. In the curve construction, a mechanism to adjust the position of the clamp device to the "shift" in the left-right direction with respect to the normal line of the built-in pile in the traveling direction and to follow the deviation caused by the difference in the diameter of the existing pile and the pitch error of the existing pile Make up.

FIG. 8 is a cross-sectional view showing a main part of an example of a conventional clamp device. A movable claw 13 is attached to the other end of a clamp cylinder 15 integrated with a fixed claw 12 and fixed as the clamp cylinder 15 is extended. The claws 12 and the movable claws 13 are inscribed in the steel pipe pile and two-direction thrusts F and F are applied. The steel pipe pile is clamped from the inside by the frictional resistances R ₁ and R ₂ shown in FIG. The reaction force at the time of steel pipe pile press-fitting can be taken. FIG. 10 shows a main part of another example of a conventional clamping device, in which movable claws 13a and 13b are attached to the other ends of two clamp cylinders 15a and 15b integral with the fixed claws 12, respectively. The fixed claws 12 and the movable claws 13a, 13b are inscribed in the steel pipe piles along with the extension of 15a, 15b and thrusts 2 × F, F, F are applied in three directions, and the frictional resistances R ₁ , R shown in FIG. _The steel pipe pile can be clamped from the inside by R ₂ and R ₃ to take a reaction force at the time of press-fitting the steel pipe pile.

In Patent Document 1, a saddle is attached to the lower part of a slide frame of a pile press-in / pull-out machine so as to be slidable back and forth, a plurality of clamp slides are provided inside the saddle, and a clamp back-and-forth moving mechanism is provided between front and rear of each clamp slide. The clamp slides are independently connected so as to be able to move back and forth independently. Each clamp slide has a lower U-shaped clamp which clamps the outer periphery of the upper end of the steel pipe pile with fixed claws and movable claws on both sides. A clamp mechanism of a pile press-in and pull-out machine for steel pipe piles in which a frame is slidable left and right is disclosed. Further, Patent Literature 2 discloses a steel pipe pile or the like in which a deformation prevention plate is provided to abut against an inner side surface of a steel pipe peg or the like that is sandwiched, and a lifting means for moving the deformation prevention plate into and out of the steel pipe pile or the like is provided in a frame. Clamp mechanism has been proposed.
Japanese Patent Publication No. 7-72419 Japanese Patent Publication No. 8-9865

  In the above-described conventional steel pipe pile clamping device, for example, in the example shown in FIG. 8, in the example shown in FIG. , The width in the direction perpendicular to the extension direction of the clamp cylinder 15 does not become narrow even when the clamp cylinder 15 is reduced, so that the steel pipe pile is easily deformed, and the thickness of the applicable steel pipe pile is reduced. There is a problem that small cases cannot be handled. In the example shown in FIG. 10, the fixed claws 12 and the movable claws 13a, 13b are inscribed in the steel pipe pile with the extension of the two clamp cylinders 15a, 15b, and the thrusts 2 × F, F, F in three directions are applied to the steel pipe. Although the reaction force can be obtained by clamping the pile from the inside, if the applicable steel pipe pile diameter is relatively large, the force is dispersed in three directions by extending the two clamp cylinders 15a and 15b, and the existing steel pipe is displaced. Although the deformation of the pile in the diameter direction can be reduced, when the diameter of the steel pipe pile is small, only one clamp cylinder 15 can be arranged in the allowable space, so the configuration shown in FIG. 8 must be adopted. There is a problem that can not be obtained.

  In particular, in the example shown in FIG. 8, the thrust protruding outward in contact with the existing steel pipe pile is in one direction, and the amount of deformation of the steel pipe pile in the protruding direction becomes significantly larger than in the example in which the thrust is three directions. There is a drawback.

  Therefore, the present invention solves the problems of the conventional steel pipe pile clamping device described above, and the steel pipe pile is not deformed without being affected by the thickness of the applicable steel pipe pile. An object of the present invention is to provide a steel pipe pile clamping device capable of dispersing a force in three directions by extending a single clamp cylinder regardless of the diameter of the pile to reduce the deformation of the existing steel pipe pile in the diameter direction. And

  In order to achieve the above object, the present invention disposes a clamp device for a steel pipe pile below, and mounts the steel pipe pile on a pedestal fixed on an existing steel pipe pile and a slide base slidably mounted on the pedestal. A guide frame rotatably mounted on a vertical axis, an elevating body mounted on the guide frame so as to be movable up and down and having a pile press-in / draw-out cylinder, and a swivel provided below the elevating body In a steel pipe pile press-in / pull-out machine equipped with a free pile gripping device, a movable claw divided into two is attached to the other end side of a clamp cylinder integrated with a fixed claw with an equalizer interposed therebetween to provide a steel pipe pile clamping device. A clamping device that can take a reaction force at the time of press-fitting a steel pipe pile by inclining a fixed claw and two movable claws to the steel pipe pile by extending a clamp cylinder and clamping the steel pipe pile from the inside. Structure It is to.

  Specifically, by applying thrusts in three directions from the inside to the outside of the existing steel pipe pile by extending the clamp cylinder, the steel pipe pile is clamped from the inside, and the reaction force at the time of press-fitting the steel pipe pile is obtained by frictional resistance. I have. Each of the two movable claws is configured to be independently rotatable in a horizontal direction about a pin as an axis. Further, when the clamp cylinder is reduced, the fixed contact portion integral with the fixed claw contacts the two movable contact portions formed on the movable claw, so that the entire width of the movable claw is reduced in the clamp cylinder reduction direction. It is.

  According to the steel pipe pile clamping device obtained by the present invention, the force due to the extension of one clamp cylinder is dispersed and acts on the movable claw in two directions by the equalizer, and as a result, thrust in three directions is obtained. The steel pipe pile can be clamped without causing deformation of the steel pipe pile. In addition, when the clamp cylinder is reduced, the width in the direction perpendicular to the direction in which the clamp cylinder extends is narrowed, and the clamp can be easily released without being affected by the thickness of the steel pipe pile and the diameter of the steel pipe pile.

  Therefore, it is possible to minimize the deviation of the design reference pitch at the time of steel pipe pile press-in and pull-out, and the deformation of the steel pipe pile to be press-fitted and structural defects due to poor verticality, and eliminate the need for modification or re-construction work by other means. In addition to shortening the construction period, compared with the conventional two-cylinder system, it is possible to obtain an effect that the mechanism can be simplified, the mechanical cost can be reduced, and the manufacturing cost can be reduced.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a steel pipe pile clamping device according to the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a steel pipe pile press-in / pull-out machine 1 as a whole, 2 is a pedestal, and 3 is a clamp device which is disposed below the pedestal 2 and takes a reaction force by using an existing steel pipe pile. . In this example, the clamp device 3 is divided into a front clamp device 3a and a rear clamp device 3b. C indicates the traveling direction of the steel pipe pile press-in / draw-out machine 1. FIG. 2 is an enlarged side view of the front clamp device 3a, and FIG. 3 is an enlarged front view of the rear clamp device 3b.

  A slide base 4 is slidably mounted on the pedestal 2 along the traveling direction of the steel pipe pile press-in / draw-out machine 1, and a support arm 5 is rotatably mounted on the slide base 4 about a vertical axis. A guide frame 6 that is rotatably supported and rotatable around a bearing 6 a provided at the front of the support arm 5 is provided upright. The guide frame 6 can be tilted about a bearing 6a by expansion and contraction of a tilt cylinder (not shown).

  An elevating body 7 is mounted on the guide frame 6 so as to be able to move up and down. A pair of left and right pile press-in / pull-out cylinders 8 are mounted on both sides of the elevating body 7, and one end of the pile press-in / pull-out cylinder 8 is supported by the bearing portion 6a so as to drive the elevating body 7 up and down. Is configured.

  A pile gripping device 9 is provided below the elevating body 7 so as to be pivotable with respect to the elevating body 7. On the inner wall surface of the pile gripping device 9, two fixed chuck claws 10a, 10a and two movable chuck claws 10b, 10b are arranged at positions opposed to the fixed chuck claws 10a, 10a. Then, the outer periphery of the steel pipe pile for construction is pushed from the cylindrical direction to the fixed-side chuck claws 10a, 10a using the movable-side chuck claws 10b, 10b by the pressing force of the chuck cylinder 11 built in the pile gripping device 9. Then, the steel pipe pile is chucked and press-fitted into and pulled out from the ground.

  4 is a longitudinal sectional view showing a main part of the front clamp device 3a or the rear clamp device 3b, FIG. 5 is a cross sectional view of a main part of FIG. 4 showing a state where the clamp mechanism is extended, and FIG. FIG. 12 is a sectional view of a similar main part showing a state, in which 12 is a fixed claw, 13a and 13b are movable claws divided into two, and the movable claws 13a and 13b are provided with pins 14 and 14 at their axes. And can be rotated in the horizontal direction. Reference numeral 15 denotes a clamp cylinder integrated with the fixed claw 12, and movable claws 13 a and 13 b are attached to the other end of the clamp cylinder 15 via an equalizer 16 (equalizer).

  Reference numeral 17 denotes a fixed contact portion integral with the fixed claw 12, and reference numerals 18 and 18 denote movable contact portions formed on the movable claws 13a and 13b. When the clamp cylinder 15 is reduced, the fixed contact portion 17 integral with the fixed claw 12 comes into contact with the movable contact portions 18 formed on the movable claws 13a and 13b.

According to such a clamping device, when the existing steel pipe pile is clamped, the fixed claw 12 and the movable claws 13a and 13b are inscribed in the steel pipe pile, and the steel pipe pile is clamped from inside by the extension of the clamp cylinder 15. However, the detailed operation mode at this time is as follows. That is, while the thrust F ₁ in the left direction is added to the fixed claw 12 with the extension of the clamp cylinder 15, as shown in FIG. 5, the movable claws 13a, the 13b, the circumferential direction via the equalizer 16 each dispersed in two directions _F 1/2 thrust _F 2, _{F 3} is applied. The thrusts F ₂ , F ₃ are balanced with the resistances W ₁ , W ₁ , W ₂ , W ₂ applied to the movable claws 13a, 13b from the inscribed surface of the existing steel pipe pile.

Thus the thrust _{F 1} leftward from the fixed pawl 12 by extension of the clamp cylinder 15, the movable claw 13a, by the thrust _F 2, _{F 3} of the _F 1/2 in the circumferential direction occurs from 13b, FIG. As shown in FIG. 7, thrusts F ₁ , F ₂ , and F _{3 in} a total of three directions are applied from the inside to the outside of the existing steel pipe pile, and the fixed claw 12 and the movable claws 13a and 13b are placed inside the steel pipe pile. The reaction force at the time of press-fitting the steel pipe pile can be taken by the pressure contact and the frictional resistances R ₁ , R ₂ , R ₃ .

Next, an operation mode when releasing the clamp of the existing steel pipe pile will be described. FIG. 6 shows a state in which the clamp cylinder 15 is reduced, and the movable contact portions 18, 18 formed on the movable claws 13 a, 13 b contact the fixed contact portion 17 integral with the fixed claw 12, and the pin of the equalizer 16 is moved. A moment M ₁ is generated by the contact position of the movable contact portions 18, 18 and the distance L ₁ between the pins 14, 14 with the axes 14, 14 as axes, and the movable claws 13 a, 13 b are clamped about the pins 14, 14 as the center of rotation. By rotating the cylinder 15 in a direction in which the direction perpendicular to the reduction direction becomes narrower, the dimension B becomes narrower, and the clamped state of the steel pipe pile can be released. Therefore, when the clamp cylinder 15 is reduced, the fixed contact portion integral with the fixed claw 12 comes into contact with the two movable contact portions on the movable claws 13a and 13b side, so that the entire width of the movable claws 13a and 13b is reduced. The clamp can be released with a decrease in the direction.

  In order to sequentially press-fit the steel pipe piles for construction into the ground, the existing steel pipe piles are firmly clamped according to the above-described operation mode with the extension of each of the clamp cylinders 15 of the front clamp device 3a and the rear clamp device 3b. While taking the reaction force, the movable chuck jaws 10b, 10b are pushed in the direction of the fixed chuck jaws 10a, 10a by the pressing force of the chuck cylinder 11 built in the pile gripping device 9, and the steel pipe pile is chucked. The steel pipe pile is pressed into the ground by driving the press-in / draw-out cylinder 8 to lower the elevating body 7 along the guide frame 6.

  As described above in detail, according to the present invention, the force due to the extension of one clamp cylinder is distributed to the movable claws in two directions by the equalizer to obtain thrust in a total of three directions. The steel pipe pile can be clamped without being affected, and the width in the direction perpendicular to the extension direction of the clamp cylinder becomes narrow even when the clamp cylinder is reduced, so that the clamp is not affected by the thickness of the steel pipe pile and the diameter of the steel pipe pile. Can be easily released. Therefore, the present invention can be used for a method such as a vibro hammer, a diesel hammer, or a Nakahori type in press-fitting and removing a steel pipe pile into the ground in various types of civil engineering foundation work, and further, a static load type steel pipe pile press-in machine.

The side view which shows the steel pipe press-in / draw-out machine to which this invention is applied as a whole. FIG. 4 is an enlarged side view of the front clamp device. FIG. 4 is an enlarged front view of the rear clamp device. FIG. 2 is a longitudinal sectional view showing a main part of the clamp device according to the present invention. FIG. 5 is an essential part cross-sectional view of FIG. 4 illustrating a state where a clamp mechanism is extended. FIG. 5 is an essential part cross-sectional view of FIG. 4 illustrating a state where the clamp mechanism is reduced. The schematic diagram showing the state where the thrust of three directions was applied from the inside of the steel pipe pile. Sectional drawing of the principal part of the example of the conventional clamp apparatus. The schematic diagram showing the state where thrust in two directions was applied from the inside of the conventional steel pipe pile. Sectional drawing of the principal part of another example of the conventional clamp apparatus. The schematic diagram showing the state where thrust in two directions was applied from the inside of the conventional steel pipe pile.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 ... Steel pipe pile press-in / draw-out machine 2 ... Pedestal 3a ... Front clamp device 3b ... Rear clamp device 4 ... Slide base 5 ... Support arm 6 ... Guide frame 6a ... Bearing part 7 ... Elevating body 8 ... Pile press-in / pull-out cylinder 9 ... Pile Gripping device 10a: fixed-side chuck claw 10b: movable-side chuck claw 11: chuck cylinder 12: fixed claw 13a, 13b: movable claw 14: pin 15: clamp cylinder 16: equalizer 17: fixed contact portion 18: movable contact portion

Claims (4)

A clamping device for a steel pipe pile is provided below and a pedestal that is fixed on an existing steel pipe pile, and a slide base that is slidably disposed on the pedestal and is rotatable about a vertical axis. A steel pipe pile including an upright guide frame, an elevating body mounted on the guide frame so as to be able to move up and down, and having a pile press-in / draw-out cylinder attached thereto, and a pivotable pile gripping device provided below the elevating body. In a press-fitting extraction machine,
A clamp device for a steel pipe pile is formed by attaching two movable claws to the other end of a clamp cylinder integrated with a fixed claw with an equalizer interposed therebetween, and the fixed claws and two movable claws are formed by extending the clamp cylinder. The steel pipe pile is inscribed in the steel pipe pile, and the steel pipe pile is clamped from the inside, thereby taking a reaction force at the time of press-fitting the steel pipe pile. A clamping device for a steel pipe pile is provided below and a pedestal that is fixed on an existing steel pipe pile, and a slide base that is slidably disposed on the pedestal and is rotatable about a vertical axis. A steel pipe pile including an upright guide frame, an elevating body mounted on the guide frame so as to be able to move up and down, and having a pile press-in / draw-out cylinder attached thereto, and a pivotable pile gripping device provided below the elevating body. In a press-fitting extraction machine,
A clamp device is formed by attaching a movable claw divided into two parts via an equalizer to the other end side of the clamp cylinder integrated with the fixed claw, and extending the clamp cylinder from the inside to the outside of the existing steel pipe pile by extending the clamp cylinder. A steel pipe pile clamping device, characterized in that the steel pipe pile is clamped from the inside by applying thrusts in three directions and the reaction force at the time of press-fitting the steel pipe pile is taken by frictional resistance.   3. The steel pipe pile clamping device according to claim 1, wherein each of the two movable claws is independently rotatable in a horizontal direction about a pin as an axis.   When the clamp cylinder is reduced, the fixed contact portion integral with the fixed claw contacts two movable contact portions formed on the movable claw, so that the entire width of the movable claw is reduced in the clamp cylinder reduction direction. The clamping device for steel pipe piles according to claim 1, 2 or 3.

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