JP3771383B2 - 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 rotate a pile body normally having a large number of tons at a high speed and stop suddenly, a pile body holding device, a power device and a brake device become large, and there is a problem that a large equipment load is required. 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]
Therefore, in the present invention, a connecting body is sandwiched between the lower pile body and the upper pile body, and friction welding is performed by rotating the connecting body. Since the connection body is short and lightweight, the joint pile device for friction welding can be made small and simple.
[0006]
By the way, even when the connecting body as described above is used, if the connecting body is simply cylindrical, it is difficult to transmit the rotational force for high-speed rotation. For this reason, for example, it is conceivable to process a gear on the peripheral surface of the connection body so that the rotational force can be transmitted to the connection body via the gear.
[0007]
However, processing a gear that can withstand high-speed rotation for each connection body causes an increase in the cost of the connection body.
[0008]
The present invention has been made in view of such problems, and it is an object of the present invention to reliably transmit a rotational force for rotating a connection body at a high speed without performing fine processing on each connection body. And
[0009]
[Means for Solving the Problems]
Therefore, in the present invention, in the joint pile construction method for joining the upper pile body to the lower pile body by friction welding by sandwiching the connected body between the lower pile body and the upper pile body and rotating the connected body,
A rotational pile transmitting method is characterized in that a rotational force transmission member is detachably attached around the connection body, and the connection body is rotated via the rotational force transmission member.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
An example of the present invention will be described with reference to FIGS.
[0011]
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.
[0012]
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.
[0013]
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 connecting 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 1b 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 body 1 has a metal end plate, it is preferable that 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. Moreover, it is preferable that the connection body 2 is as short as possible within a range in which high-speed rotation and sudden stop can be performed with the rotational force transmission member 3 described below attached.
[0014]
A rotational force transmission member 3 is detachably attached around the connection body 2. The rotational force transmitting member 3 is for transmitting the rotational force from the driving device 4 such as a hydraulic motor to the connecting body 2 and rotating it at a high speed, and the rotational force transmitting member 3 in this example is a gear. Yes.
[0015]
The connection body 2 and the rotational force transmission member 3 will be further described with reference to FIGS.
[0016]
As shown in FIG. 2, the connecting body 2 has a cylindrical shape with substantially the same diameter as the pile body 1 (see FIG. 1), and a fixing plate 6 having through holes 5 on the upper and lower sides is projected on the side surface. ing.
[0017]
3A is a plan view of the rotational force transmission member 3, and FIG. 3B is a side view thereof. The rotational force transmitting member 3 in this example is an annular gear that is divided in two in the radial direction at the root portion, and the inner diameter when the two divided pieces are combined is substantially equal to the outer diameter of the connection body 2. Fixing plates 8 each having a through hole 7 project vertically from the split end of each split piece. Further, the central portion of the lower surface of the rotational force transmitting member 3 combined with the two divided pieces slightly protrudes downward, and its peripheral surface is a tapered surface 9. In addition, although the rotational force transmission member 3 in this example is divided into two parts, it can also be made into three or more parts.
[0018]
4A is a side view of the state where the rotational force transmitting member 3 is attached to the connection body 2, and FIG. 4B is a plan view thereof. The rotational force transmission member 3 is attached to the connection body 2 by assembling the divided pieces of the rotational force transmission member 3 to the connection body 2 so that the connection body 2 serves as the axial center of the rotational force transmission member 3. The fixing plate 8 and the fixing plate 6 of the connection body 2 are overlapped with each other and tightened with bolts 10 through the through holes 5 and 7. The rotational force transmission member 3 in this example is attached to the periphery of the connection body 2 with the connection body 2 as an axis, and constitutes an integral gear. Moreover, the rotational force transmission member 3 attached to the connection body 2 in this way can be removed from the connection body 2 by removing the bolt 10.
[0019]
As shown in FIG. 1, after the upper pile body 1 b is set up on the lower pile body 1 a with the connecting body 2 to which the rotational force transmitting member 3 is attached, the joint pile device 11 is set. This joint pile device 11 is provided with a moving base 13 with wheels having a U-shaped recess 12 in the front. A frame 15 for holding the support shaft 14 in the vertical direction is provided on the movable base 13. The support shaft 14 is slidable in the vertical direction, the lower pile body gripping portion 16, and the connection body rotation control portion. 17 and the upper pile holding part 18 are attached.
[0020]
First, the moving base 13 is brought close to the pile body 1 so that the lower pile body 1a enters the recess 12 in front of the movable base 13, and then the lower pile body gripping portion 16 and the upper pile body gripping portion 18 are respectively moved to the lower portion. While fixing to the pile body 1a and the upper pile body 1b, the connection body rotation control part 17 is set with respect to the rotational force transmission member 3 attached to the connection body 2. FIG.
[0021]
The lower pile body gripping portion 16 and the upper pile body gripping portion 18 are respectively as shown in FIG. 5, a gripping portion main body 19 slidably attached to the support shaft 14, and a gripping portion. A presser arm 21 that protrudes forward (pile body 1 side) from the main body 19 and bends in an L shape, and the inside of the bent piece becomes a presser portion 20, and a gripper main body that opposes the presser portion 20 of the presser arm 21 19 is provided with a receiving portion 22 having a V-shaped groove provided at the front surface position. The base part of the presser arm 21 is held so as to be movable back and forth with respect to the gripping part main body 19, and the worm gear 23 provided on the gripping part main body 19 is rotated forward and reverse by a driving device 24 such as a hydraulic motor. When the rack 25 formed at the base of the presser arm 21 is engaged with the worm gear 23, the rack 25 is moved forward and backward.
[0022]
The lower pile body gripping part 16 and the upper pile body gripping part 18 grip the lower pile body 1a and the upper pile body 1b, respectively. In this gripping, the presser arm 21 is advanced, the presser part 20 and the receiving part 22 are opened, the lower pile body 1a and the upper pile body 1b are inserted therebetween, and then the presser arm 21 is moved backward. The lower pile body 1 a and the upper pile body 1 b are sandwiched between the presser portion 20 and the receiving portion 22.
[0023]
On the other hand, the connection body rotation control unit 17 is as shown in FIGS. 6 and 7, and includes a rotation control unit main body 26 that is slidably attached to the support shaft 14 and forward from the rotation control unit main body 26. The presser arm 27 protrudes and is bent in an L shape so as to be tiltable in the horizontal direction. The presser arm 27 is provided with a cylinder / piston device 28 straddling the base side and the bent piece side, and the operation of the presser arm 27 (actuated by hydraulic pressure or pneumatic pressure) is activated by the cylinder / piston device 28. The bent piece can be tilted in the horizontal direction.
[0024]
At the tip of the bent piece of the presser arm 27, a rotatable idler gear 29 that meshes with the rotational force transmitting member 3 (gear in this example) attached to the connection body 2, and a tapered surface 9 on the lower surface of the rotational force transmitting member 3. A rotatable support roller 30 in contact therewith is provided. A drive gear 31 that also meshes with the rotational force transmitting member 3 is provided at the front surface position of the rotation control unit main body 26 facing the idler gear 29. The drive gear 31 is rotated by the drive device 4, whereby the rotational force transmission member 3 and the connection body 2 are rotated. Further, rotatable support rollers 32 and 33 that are in contact with the tapered surface 9 on the lower surface of the rotational force transmitting member 3 are provided at the front surface position of the rotation control unit main body 26 that forms a planar triangle with the support roller 30 as a vertex. The rotational force transmitting member 3 and the connection body 2 can be supported from three directions together with the support roller 30.
[0025]
The set of the connecting body rotation control unit 17 is a connecting body in which the rotational force transmitting member 3 is attached to the rotation control unit body 26 in a state where the bent portion of the presser arm 27 is tilted forward and extended to some extent. 2 and then the bent portion of the presser arm 27 is returned to engage the idler gear 29 and the drive gear 31 with the rotational force transmitting member 3, and the taper surface of the rotational force transmitting member 3 between the support rollers 30, 32, 33. This is done by pinching 9 and positioning it. When the drive device 4 is operated in this state to rotate the drive gear 31, the rotation is transmitted to the rotational force transmitting member 31 and rotated together with the connection body 2. At this time, the idler gear 29 and the support rollers 30, 32, 33 rotate with the rotation of the rotational force transmission member 3.
[0026]
After setting the joint pile device 11 as described above, the drive device 4 is operated, and the connection body 2 is rotated at high speed via the drive gear 31 and the rotational force transmission member 3. 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.
[0027]
When the frictional heat is sufficiently generated until the lower pile body 1a and the upper pile body 1b can be welded via the connecting body 2, the drive of the drive device 4 is stopped and a load is applied to the rotation of the drive gear 31. The rotation of the rotational force transmission member 3 is braked, and the rotation of the connection body 2 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 part 16, the connection body rotation control part 17 and the upper pile body gripping part 18 is released and the joint pile device 11 is moved, and then the rotation attached to the connection body 2 The force transmission member 3 may be removed and the required amount of the upper pile body 1b may be buried. If necessary, further friction welding of the pile body 1 is performed in the same manner. At this time, the previously used rotational force transmission member 3 can be attached to the new connection body 2 again and used. .
[0028]
8 and 9 show an example of the connection body rotation control unit 17 when the rotational force transmission member 3 is a pulley, which is basically the same as that described in FIGS. The mounting state of the rotational force transmitting member 3 to 2 is the same as that described above. However, the drive gear 29 in the example of FIGS. 6 and 7 does not exist, and the drive pulley 34 rotated by the drive device 4 is provided at a position slightly away from the rotational force transmission member 3. The difference is that the drive belt 35 is stretched between the transmission members 3.
[0029]
The configuration shown in FIGS. 8 and 9 can also be used when the rotational force transmission member is a sprocket and is rotated through a drive chain. In this case, the drive pulley 34 may be replaced with a drive sprocket, and the drive belt 35 may be replaced with a drive chain.
[0030]
8 and 9, the same reference numerals as those in FIGS. 6 and 7 denote the same members.
[0031]
When the rotational force transmission member 3 is a pulley or a sprocket and is rotated by the drive belt 35 or the drive chain, in order to make the connection body 2 easy to stop suddenly, a brake as shown in FIG. It is preferable to arrange the parts 36 side by side. The brake part 36 is attached to the brake part main body 37 slidably attached to the support shaft 14 so as to be slidable up and down, and the intermediate part is attached to the brake part main body 37 so that it can be tilted horizontally by the support pins 38. Two brake arms 40 having a brake plate 39 at a position, and a cylinder / piston device 41 that tilts the brake arm 40 in the horizontal direction by expanding or reducing the base side interval of the brake arm 40 are provided. .
[0032]
The brake part 36 is set by inserting the connecting body 2 between the brake arms 40 in a state where the distance between the base parts of the brake arm 40 is narrowed and the distance between the brake plates 39 is open. The brake plate 39 does not come into contact with the connection body 2 when the connection body 2 is rotated, and sandwiches the connection body 2 when the connection body 2 is brought into a state where friction welding can be performed by the rotation of the connection body 2, thereby suddenly stopping the rotation. If this brake part 36 is provided, the connection body 2 can be suddenly stopped without applying an excessive load to the drive belt 35 or the drive chain.
[0033]
11 and 12 show another example of the connection body rotation control unit 17, which is basically the same as that described with reference to FIGS. 6 and 7, but has positioning rollers 42 to 44. FIG. It has become. The positioning roller 43 is attached to the presser arm 27, and the positioning rollers 42 and 44 are provided on the front side of the rotation control unit main body 26 that forms a planar triangle with the positioning roller 43 as a vertex. Each of the positioning rollers 42 to 44 is rotatable, and comes into contact with the connection body 3 from three sides to position the connection body 2 at a correct position.
[0034]
If it carries out as mentioned above, it will become easy to perform the positioning of the connection body 2. FIG. In this case, the tapered surface 9 and the support rollers 30, 32, and 33 can be omitted.
[0035]
【The invention's effect】
The present invention is as described above, and has the following effects.
[0036]
(1) Since the connecting body 2 that rotates at high speed and stops suddenly for friction welding is short and light, it can be constructed with a small and simple joint pile device 11.
[0037]
(2) For the same reason, it is easy to maintain the balance during the high-speed rotation of the connection body 2, and no strict preparation is required, and the work is reduced.
[0038]
(3) By rotating the connection body 2 via the rotational force transmission member 3, the necessary rotational force can be reliably transmitted to the connection body 2.
[0039]
(4) Since the rotational force transmission member 3 can be attached to and detached from the connection body 2, the rotational force transmission member 3 can be used repeatedly, and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an example of a joint pile construction method according to the present invention.
FIG. 2 is an enlarged perspective view of the connection body shown in FIG. 1;
FIG. 3 is an enlarged view of the rotational force transmission member shown in FIG. 1;
4 is an enlarged view of a state in which the rotational force transmission member of FIG. 3 is attached to the connection body of FIG. 2;
FIG. 5 is an enlarged plan view of a lower pile body gripping portion and an upper pile body gripping portion shown in FIG. 1;
6 is an enlarged side view of the connection body rotation control unit shown in FIG. 1; FIG.
FIG. 7 is an enlarged plan view of the connection body rotation control unit shown in FIG. 1;
FIG. 8 is an enlarged side view showing an example of a connection body rotation control unit when a rotational force transmitting member is a pulley.
FIG. 9 is an enlarged plan view of the connection body rotation control unit shown in FIG. 8;
FIG. 10 is an enlarged plan view showing an example of a brake part.
FIG. 11 is a side view showing another example of a connection body rotation control unit.
12 is a side view of the connection body rotation control unit shown in FIG. 11. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pile body 1a Lower pile body 1b Upper pile body 2 Connection body 3 Rotational force transmission member 4 Drive device 5 Through-hole 6 Fixed plate 7 Through-hole 8 Fixed plate 9 Tapered surface 10 Bolt 11 Joint pile device 12 Recess 13 Moving base 14 Support shaft 15 Frame 16 Lower pile body gripping part 17 Connected body rotation control part 18 Upper pile body gripping part 19 Grasping part main body 20 Presser part 21 Presser arm 22 Receiving part 23 Worm gear 24 Drive device 25 Rack 26 Rotation control part main body 27 Presser Arm 28 Cylinder / Piston Device 29 Idler Gear 30 Support Roller 31 Drive Gear 32 Support Roller 33 Support Roller 34 Drive Pulley 35 Drive Belt 36 Brake Part 37 Brake Part Body 38 Support Pin 39 Brake Plate 40 Brake Arm 41 Cylinder / Piston Device 42 Positioning roller 43 Positioning roller 44 Positioning roller

Claims (2)

In the joint pile construction method to join the upper pile body to the lower pile body by friction welding by sandwiching the connected body between the lower pile body and the upper pile body and rotating this connected body,
A joint construction method characterized in that a rotational force transmission member is detachably attached around a connection body, and the connection body is rotated via the rotational force transmission member. The lower pile body is gripped by using a joint pile device provided with a lower pile body gripping part, a connecting body rotation control part and an upper pile body gripping part so as to be slidable vertically with respect to the support shaft provided in the vertical direction. An annular gear and a sprocket that are divided in the radial direction while fixing the holding portion and the upper pile body gripping portion to the lower pile body and the upper pile body, respectively, and pressing the upper pile body against the lower pile body through the connecting body Alternatively, a rotational force transmission member that is a pulley is detachably attached to the periphery of the connection body, assembled into an integral gear, sprocket or pulley, and the connection body is rotated by the connection body rotation control unit via this rotational force transmission member. The joint pile construction method of Claim 1 characterized by these.

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