JP3756675B2 - Jointing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a joint pile construction method for reinforcing the ground by connecting and burying pile bodies, for example, when the support layer of the ground is in a deep part or when the height of the construction space is limited.
[0002]
[Prior art]
Conventionally, as a joint pile construction method, the upper pile body is set up on the lower pile body buried in the ground, and the upper pile body is pressed against the lower pile body and rotated at a high speed to thereby frictionally weld the pile bodies one after another. A method of adding is known (Japanese Patent Laid-Open No. 10-131178).
[0003]
[Problems to be solved by the invention]
By the way, in order to perform the friction welding in the conventional joint pile construction method, the pile body is rotated at a high speed in order to generate frictional heat until welding is possible, and the pile body is rotated after the necessary frictional heat is generated. It is necessary to stop suddenly.
[0004]
However, in order to make a pile body, which usually has many tons, rotate at a high speed and can be stopped suddenly, the pile body holding device, power unit and brake device become large-scale, and there is a problem that the equipment burden is large. is there. In addition, if there is a deficiency in preparation for shaft alignment, vertical alignment, etc. before high-speed rotation, the balance of pile bodies that are rotated at high speed tends to be lost, so this preparation must be done strictly. There is also a problem that takes.
[0005]
The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to make it possible to add a pile body by friction welding without using a large-scale device with a simple operation.
[0006]
[Means for Solving the Problems]
For this purpose, in the present invention, the connecting body is sandwiched between the lower pile body and the upper pile body, while the lower pile body gripping portion and the connecting body rotation are slidable vertically with respect to the support shaft provided in the vertical direction. Using the joint pile device provided with the control part and the upper pile body gripping part, while fixing the lower pile body gripping part and the upper pile body gripping part to the lower pile body and the upper pile body, respectively, Pile construction characterized by joining the upper pile body to the lower pile body by friction welding by rotating the connected body by the connected body rotation control part of the joint pile device while pressing against the lower pile body through the connected body A method is provided.
[0007]
Further, the present invention provides the above-mentioned pile construction method, wherein the lower pile body gripping part, the connection body rotation control part, and the upper pile body gripping part are slidable vertically with respect to the support shaft provided in the vertical direction. Fix the lower pile body gripping part and the upper pile body gripping part to the lower pile body and the upper pile body, respectively, and press the upper pile body against the lower pile body via the connecting body using the provided joint pile device However, the present invention also provides a joint pile construction method characterized by friction welding by rotating the connection body by the connection body rotation control unit of the joint pile device.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An example of the present invention will be described with reference to FIGS.
[0009]
In FIG. 1, 1 is each pile body to be embed | buried, 1a, 1b is the lower pile body and upper pile body which are the connection objects now. As each pile body 1, although it is usually preferable that it is a steel pipe pile, if a metal end plate (generally made of steel) capable of friction welding is provided on the connection surface, a steel pipe concrete pile (steel pipe and Concrete piles or concrete piles may be used.
[0010]
The lower pile body 1a is embedded in the ground leaving the upper part exposed on the ground. Each pile body 1 may be buried by striking, but it is preferable to bury the pile body 1 by rotating press-fitting as the lowest pile body 1 having a screw blade at the tip. When the pile body 1 is rotationally press-fitted, the upper pile body 1b can be pressed against the lower pile body 1a via the connecting body 2 using a device for rotational press-fitting at the time of friction welding described later.
[0011]
After burying the lower pile body 1a in the ground leaving the upper part, the upper pile body 1b is erected on the upper end of the lower pile body 1a so as to be substantially aligned with the central axis. At this time, the connection body 2 is sandwiched between the upper end surface of the lower pile body 1a and the lower end surface of the upper pile body 1a with the central axis substantially matched. As will be described later, this connection body 2 is rotated at high speed to join the upper pile body 1b to the lower pile body 1a by friction welding. In order to obtain a good friction welding state, each pile body 1 is When it is a steel pipe pile, it is preferable that it is the same material as this steel pipe pile, and when each pile 1 has a metal end plate, it is the same material as this metal end plate. The connecting body 2 is usually a hollow cylindrical body having the same diameter as each pile body 1, but can also be a solid cylindrical body. Further, the connecting body 2 can be set with a rotation mechanism and a brake mechanism, which will be described later, and is preferably as short as possible within a range in which high-speed rotation and sudden stop can be performed.
[0012]
As described above, after the upper pile body 1b is erected on the lower pile body 1a with the connecting body 2 interposed therebetween, the joint pile device 3 is set. This joint pile device 3 is provided with a moving base 5 with a wheel having a U-shaped recess 4 in the front, and a frame 7 for holding the support shaft 6 in the vertical direction is provided on the moving base 5. A lower pile body gripping portion 8, a connecting body rotation control portion 9, and an upper pile body gripping portion 10 are attached to the support shaft 6 so as to be slidable vertically.
[0013]
First, the moving base 5 is brought close to the pile 1 so that the lower pile body 1a enters the recess 4 in front of the movable base 5, and then the lower pile body gripping portion 8 and the upper pile body gripping portion 10 are respectively connected to the lower pile. While fixing to the body 1a and the upper pile body 1b, the connection body rotation control part 9 is set with respect to the connection body 2. FIG.
[0014]
The lower pile body gripping portion 8 and the upper pile body gripping portion 10 are as shown in FIGS. 1 and 2, respectively, and a gripping portion main body 11 slidably attached to the support shaft 6; A presser arm 13 that protrudes forward (pile body 1 side) from the gripping part body 11 and bends in an L shape, and the inside of the bent piece becomes a presser part 12, and a grip that faces the presser part 12 of the presser arm 13 It has the receiving part 14 which makes the plane V-shaped groove | channel provided in the holding | maintenance part main body 11 front surface position. The base of the presser arm 13 is held so as to be movable back and forth with respect to the gripping part main body 11, and a worm gear 15 provided on the gripping part main body 11 is rotated forward and reverse by a driving device 16 such as a hydraulic motor. When the rack 17 formed at the base of the presser arm 13 is engaged with the worm gear 15, the rack 17 is moved back and forth.
[0015]
The lower pile body gripping portion 8 and the upper pile body gripping portion 10 are fixed to the lower pile body 1a and the upper pile body 1b by moving the presser arm 13 forward and opening between the presser portion 12 and the receiving portion 14, respectively. In the state, the lower pile body 1a and the upper pile body 1b are inserted between them, and then the presser arm 13 is retracted to sandwich the lower pile body 1a and the upper pile body 1b between the presser portion 12 and the receiving portion 14. It is done by grabbing.
[0016]
On the other hand, the connection body rotation control unit 9 is as shown in FIGS. 1, 3 and 4, and a rotation mechanism and a brake mechanism are provided on the rotation control unit main body 18 slidably attached to the support shaft 6. It has been provided.
[0017]
The rotation mechanism is as shown in FIG. 1 and FIG. 3. The rotation mechanism protrudes forward from the rotation control unit main body 18, bends in an L shape, and has a presser arm 20 provided with a presser roller 19 at the end of the bent piece. The auxiliary roller 21 and the driving roller 22 are provided respectively at the front surface of the rotation control unit main body 18 having a plane triangle with the presser roller 19 as a vertex. As with the presser arm 13 in the lower pile body gripping portion 8 and the upper pile body gripping portion 10, the presser arm 20 includes a worm gear 24 that is rotated forward and backward by a drive device 23 such as a hydraulic motor, and a presser arm 20. It is moved forward and backward by meshing with a rack 25 formed at the base of the base.
[0018]
In the setting of the rotating mechanism to the connection body 2, the presser arm 20 is also moved forward, and the connection body 2 is inserted between the presser roller 19, the auxiliary roller 21 and the drive roller 22. By reversing the arm 20, the connecting body 2 is sandwiched between the pressing roller 19, the auxiliary roller 21, and the driving roller 22 and held. When the drive roller 22 is rotated by a drive device 26 such as a hydraulic motor in this state, the rotation of the drive roller 22 is transmitted to the connection body 2 due to the frictional force between the drive roller 22 and the connection body 2, and the connection body 2 is rotated. be able to. The presser roller 19 and the auxiliary roller 21 are rotatable, and rotate with the rotation of the connection body 2 while pressing and stabilizing the connection body 2.
[0019]
The brake mechanism is as shown in FIG. 1 and FIG. It has two brake arms 29 and a drive unit 30 such as a hydraulic cylinder piston that tilts the brake arm 29 in the horizontal direction by expanding or reducing the base side interval of the brake arm 29.
[0020]
The setting of the brake mechanism to the connection body 2 is performed by inserting the connection body 2 between the brake arms 29 with the distance between the base portions of the brake arm 29 narrowed and the distance between the brake plates 28 opened. The brake plate 28 is not in contact with the connecting body 2 when the connecting body 2 is rotated by the rotating mechanism, and when the connecting body 2 is brought into a state where friction welding can be performed by the rotation of the connecting body 2, the connecting plate 2 is sandwiched and the rotation is suddenly stopped. It is something to be made.
[0021]
After setting the joint pile device 3 as described above, the drive device 26 is operated in a state where the brake plate 28 is separated from the connection body 2, and the connection body 2 is rotated at high speed via the drive roller 22. Along with this rotation, the upper pile body 1b is pressed against the lower pile body 1a, and frictional heat is generated as the connecting body 2 rotates. The pressing of the upper pile body 1b to the lower pile body 1a can be performed by applying a downward force to the upper end portion of the upper pile body 1b in the same manner as in the past.
[0022]
When the frictional heat is sufficiently generated until the lower pile body 1a and the upper pile body 1b can be welded, the operation of the drive device 26 is stopped, the drive device 30 is activated, and the brake plate 28 at the tip of the brake arm 29 is connected. The body 2 is sandwiched and its rotation is suddenly stopped. And thereby, the upper pile body 1b can be connected via the connection body 2 with respect to the lower pile body 1a. After that, each set of the lower pile body gripping portion 8, the connection body rotation control portion 9 and the upper pile body gripping portion 10 is released, and after the joint pile device 3 is moved, the necessary amount of the upper connection body 1b is buried. If necessary, further friction welding of the pile body 1 may be performed in the same manner.
[0023]
FIG. 5 shows another example of the joint pile device 3 used in the present invention. The auxiliary roller 31 is rotatable to a position corresponding to the drive roller 22 of the connection body rotation control unit 9 described in FIGS. 1 and 3. And the connection body 2 is rotated by the rotation of the drive gear 33 that meshes with the connection body gear 32 formed on the peripheral surface of the connection body 2. The point that the described brake mechanism is omitted is different from the joint pile device 3 described in FIGS. The brake of the connecting body 2 in the joint pile device is applied by stopping the driving of the driving device 26 and applying a load to the rotation of the driving gear 33. If it does in this way, transmission of the rotational force from the drive device 26 to the connection body 2 is reliable, and there exists an advantage which can be set as the simpler pile device 3 which abbreviate | omitted the brake mechanism. In FIG. 5, the same reference numerals as those in FIGS. 1 to 4 denote the same members.
[0024]
【The invention's effect】
The present invention is as described above, and has the following effects.
[0025]
(1) The connection body 2 sandwiched between the lower pile body 1a and the upper pile body 1b is rotated at a high speed for friction welding. Since this connection body 2 is short and lightweight, friction welding is possible. The rapid stop after the necessary high-speed rotation and the necessary frictional heat can be performed with the small and simple joint pile device 3, and the equipment burden is greatly reduced.
[0026]
(2) For the same reason as described above, the balance at the time of high-speed rotation of the connection body 2 can be easily maintained, so that no strict preparation is required and the work is reduced.
[Brief description of the drawings]
FIG. 1 is an explanatory view of a joint pile construction method according to the present invention and a joint pile device used therefor.
FIG. 2 is an enlarged plan view of a lower pile body gripping portion and an upper pile body gripping portion portion in the joint pile device of FIG. 1;
FIG. 3 is an enlarged plan view of a rotation mechanism portion of a connection body rotation control unit in the joint pile device of FIG. 1;
4 is an enlarged plan view of a brake mechanism portion of a connection body rotation control unit in the joint pile device of FIG. 1. FIG.
FIG. 5 is a view showing another example of a joint pile device used in the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pile body 1a Lower pile body 1b Upper pile body 2 Connection body 3 Joint pile apparatus 4 Recessed part 5 Moving base 6 Support shaft 7 Frame 8 Lower pile body holding part 9 Connection body rotation control part 10 Upper pile body holding part 11 Grasp part main body 12 Presser part 13 Presser arm 14 Receiving part 15 Worm gear 16 Drive device 17 Rack 18 Rotation control part main body 19 Presser roller 20 Presser arm 21 Auxiliary roller 22 Drive roller 23 Drive device 24 Warm gear 25 Rack 26 Drive device 27 Support pin 28 Brake plate 29 Brake arm 30 Drive device 31 Auxiliary roller 32 Connector gear 33 Drive gear

Claims (1)

Included No other hand sandwiching the connector between the lower pile body and the upper pile body slidably lower pile body gripping portion up and down respectively relative to the support shaft provided vertically, the connection member rotation control unit and the upper pile Using the joint pile device provided with the body gripping part, the lower pile body gripping part and the upper pile body gripping part are fixed to the lower pile body and the upper pile body, respectively, and the upper pile body is connected via the connecting body. A joint construction method characterized in that the upper pile body is joined to the lower pile body by friction welding by rotating the connected body by the joint body rotation control unit of the joint pile device while pressing against the lower pile body.

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