JP2004190397A - Tip cover mounting tool for pipe pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate mounting work (welding) while adjusting the plane direction of a tip cover to be orthogonal to the axis of a pipe pile in mounting the tip cover to the pipe pile driven into the ground, to the inside by a prescribed amount from the tip part. <P>SOLUTION: The mounting tool 1 has a gage part 10 fittable in the state of abutting at least at three points in a circumferential direction to the tip part inner peripheral surface of the pipe pile 2; a stopper part 11 abutting on the tip part opening edge of the pipe pile 2 when fitting the gage part 10 into the tip part of the pipe pile 2; and a magnet 12 provided on the side turned into the pipe pile 2 in the gage part 10 to attract the tip cover 5. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a jig for mounting a pipe pile front lid.
[0002]
[Prior art]
When building a building on soft ground, it is widely known that a pipe pile is previously driven into the ground.
A pipe pile (a pile driven while rotating) used in a pile driving machine such as a non-discharge-type rotary pile driving machine is, in many cases, a metal hollow pipe formed by centrifugally casting a steel or iron material (for example, Patent Document 1 etc.).
In such a pipe pile, it is preferable to close the tip end with a front lid in measuring the driving depth into the ground.
[0003]
In this case, the front lid is welded to the tip of the pipe pile when the pipe pile is manufactured. Recently, there has been proposed a pipe pile in which a drilling claw provided at the tip of the pipe pile is incorporated into the inside of the tip of the pipe pile. The efficiency is achieved (see Patent Document 2).
[0004]
[Patent Document 1]
JP-A-7-173832 [Patent Document 2]
JP-A-2002-81060
[Problems to be solved by the invention]
As described above, the attachment of the front lid is also recommended when the excavation claw is incorporated into the tip of the pipe pile.
Here, in order to mount the front lid, it is necessary to avoid interference with the excavation claw, so that the front lid has to be mounted in a state of being pulled inward by a predetermined amount from the tip of the pipe pile.
However, in attaching the front lid inward from the tip of the pipe pile by a predetermined amount in this way, it is very difficult to make the plane direction of the front lid accurately perpendicular to the axis of the pipe pile. there were.
[0006]
If the plane direction of the front lid is not orthogonal to the axis of the pipe pile, an error will occur in the measurement of the driving depth.
The present invention has been made in view of the above circumstances, and, when attaching a front lid to a pipe pile driven into the ground by a predetermined amount inward from a tip end thereof, the surface of the front lid with respect to the axis of the pipe pile. It is an object of the present invention to provide a pipe pile front lid mounting jig which can easily perform this mounting operation (welding) while making the directions orthogonal to each other.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has taken the following measures.
That is, the mounting jig 1 according to the present invention is used when the front cover 5 for closing the distal end is attached to the pipe pile 2 inward from the distal end by a predetermined amount.
The mounting jig 1 includes a gauge portion 10 that can be fitted to the inner peripheral surface of the tip of the pipe pile 2 at abutment at at least three points in the circumferential direction thereof. A stopper portion 11 which comes into contact with the opening edge of the tip of the pipe pile 2 when fitted into the tip of the pipe; and a magnet 12 for attracting the front lid 5 provided on the side of the gauge portion 10 which faces the inside of the pipe pile 2. And
[0008]
In the mounting jig 1 having such a configuration, when the gauge portion 10 is fitted into the distal end portion of the pipe pile 2, the outer surface of the gauge portion 10 abuts at three or more circumferential directions on the inner peripheral surface of the distal end portion of the pipe pile 2. Accordingly, the gauge portion 10 and the tip of the pipe pile 2 can be easily maintained in a concentric relationship.
Also, by fitting the stopper 11 to the opening edge of the tip of the pipe pile 2, the fitting amount of the gauge part 10 to the tip of the pipe pile 2 can be made constant.
For this reason, if the front lid 5 is attracted and held by the magnet 12 provided on the gauge portion 10 and the gauge portion 10 is fitted into the tip portion of the pipe pile 2, a predetermined amount of the inside of the tip portion of the pipe pile 2 is moved. The front lid 5 can be held in a predetermined position (in a state where the surface direction of the front lid 5 is perpendicular to the axis of the pipe pile 2).
[0009]
With the front lid 5 held in this manner, the inner periphery of the distal end portion of the pipe pile 2 and the outer peripheral surface of the front lid 5 are spot-welded at an appropriate number of places in the circumferential direction, or in the circumferential direction. May be given a predetermined length and then welded.
It is preferable that the gauge part 10 is formed in a ring shape that fits into the tip of the pipe pile 2 without looseness.
By doing so, the shape of the gauge portion 10 can be made the simplest, which leads to the fact that the mounting jig 1 can be manufactured with a simple structure and at low cost.
[0010]
It is preferable that the gauge portion 10 is provided with a play removing spring 15 capable of elastically pressing the inner peripheral surface at a position in contact with the inner peripheral surface of the distal end portion of the pipe pile 2.
In this way, when the gauge portion 10 is fitted into the tip of the pipe pile 2, a complete rattling prevention state can be obtained even if vibration or impact is applied to the pipe pile 2. The state of being positioned will be maintained. In addition, it is not necessary to increase the manufacturing accuracy of the gauge portion 10 itself, and it is possible to cope with the variation in the inner diameter accuracy of the pipe pile 2 side.
[0011]
The gauge section 10 has a main body section 14 having a portion that comes into contact with the inner peripheral surface of the distal end portion of the pipe pile 2, and a leg section 16 that projects from the main body section 14 to the inside of the pipe pile 2. Can be.
In this case, a welding work space 25 may be secured between the main body 14 and the magnet 12 along the axial direction of the pipe pile 2 in accordance with the amount of protrusion by the legs 16.
The welding rod 30 may be inserted into the welding work space 25 to perform welding between the inner peripheral surface of the tip of the pipe pile 2 and the outer peripheral surface of the front lid 5.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 show one embodiment of a mounting jig 1 according to the present invention.
FIGS. 5 and 6 show a pipe pile 2 manufactured by using the mounting jig 1. At the tip (lower end in FIG. 5), several spiral blades 3 are provided on the outer peripheral surface. Is provided, and a claw 4 for excavation is provided so as to protrude from the inside of the distal end portion toward the end thereof (downward in FIG. 5). The front lid 5 is incorporated at a position in which the pipe pile 2 is pulled inward from the claw 4 in the axial direction.
[0013]
The claw 4 is shaped so as to cross the inner diameter of the pipe pile 2 in a state of being bent in a crank shape. Due to this bent shape, the front surface 4a of the claw 4 in the rotation direction has a displacement W corresponding to the wall thickness with respect to the line P passing through the rotation center (tube axis) of the pipe pile 2; Due to the displacement amount W, the soil scraped by the claw 4 is pushed out in the oblique direction S, and as a result, the pipe pile 2 is efficiently driven into the ground.
The mounting jig 1 according to the present invention has a gauge part 10, a stopper part 11, and a magnet 12.
[0014]
The gauge portion 10 can be fitted in a state where the gauge portion 10 is in contact with the inner peripheral surface of the distal end portion of the pipe pile 2 at at least three points in the circumferential direction.
In the present embodiment, the gauge portion 10 is arranged at three equally spaced positions in the circumferential direction (ie, at intervals of 120 °) with respect to the main body portion 14 having a ring shape slightly smaller in diameter than the inner diameter of the pipe pile 2. (Where) a spring 15 is provided.
The main body 14 is formed, for example, by cutting a metal pipe into a ring. The main body portion 14 protrudes along the ring-shaped axial direction from the peripheral edge portion (the direction toward the inside of the pipe pile 2) corresponding to three positions in the circumferential direction where the backlash removing spring 15 is attached. A leg 16 is provided.
[0015]
The backlash removing spring 15 is obtained by cutting a spring plate material into a strip shape, and is welded between the end and the leg 16 in a state where the end is aligned with each leg 16 of the main body 14. ing. The other end of the play removing spring 15 is a free end, and normally retains a curved shape away from the outer peripheral surface of the main body 15.
Therefore, when the gauge part 10 is fitted into the tip of the pipe pile 2, the free end side of the spring 15 is first brought into contact with the inner peripheral surface of the tip of the pipe pile 2. Is pushed into the pipe pile 2, each rattle removing spring 15 is deformed flat while resisting its curved shape, and finally the entire length of each rattle removing spring 15 becomes the tip of the pipe pile 2. It comes into contact with the inner peripheral surface of the part and is in a state of being elastically pressed.
[0016]
Therefore, the gauge portion 10 is fitted to the tip of the pipe pile 2 without rattling.
At this time, the outer surface of the gauge portion 10 (corresponding to the play removing spring 15) is in contact with the inner peripheral surface of the distal end portion of the pipe pile 2 at three or more points in the circumferential direction. The position is inevitably aligned with the axis of the pipe pile 2, that is, the gauge portion 10 and the tip of the pipe pile 2 are kept in a concentric relationship.
As described above, the gauge portion 10 has the main body portion 14 formed in a ring shape, and has a hollow portion 17 formed therein.
[0017]
The hollow portion 17 is used as a working space for welding as described later.
The stopper 11 comes into contact with the opening edge of the distal end of the pipe pile 2 when the gauge section 10 is fitted into the distal end of the pipe pile 2.
In the present embodiment, the stopper portion 11 is formed as a donut disk having a diameter slightly larger than the main body portion 14 of the gauge portion 10, and the opening 20 provided at the center of the donut disk is It is welded so as to be in communication with the hollow portion 17 provided in the main body portion 14.
[0018]
Therefore, in the stopper portion 11 (doughnut board), the annular surface 11 a of the part protruding from the main body portion 14 of the gage portion 10 in a flange shape to the entire periphery thereof fits the gage portion 10 into the tip portion of the pipe pile 2. In this case, it is a contact surface (butting surface) to the pipe pile 2. That is, in this contact state, the gauge portion 10 does not enter the tip portion of the pipe pile 2 further.
The magnet 12 is provided on the side of the gauge portion 2 that is directed into the pipe pile 2. In this embodiment, a stay 23 is provided on the main body portion 14 of the gauge portion 10 so as to extend in a three-pronged shape while intersecting at a central portion in the hollow portion 17. The magnet 12 is supported at the central intersection portion of the stay 23. I can do it.
[0019]
The magnet 12 is provided with a dish-shaped magnet cover 24 for obtaining the effect of strengthening the magnetic force and also for protecting the magnet 12.
When the front lid 5 is attracted and held by the magnet 12, the front lid 5 does not reach (does not contact) the magnet 12 due to contact interference with the leg 16 provided on the gauge section 10. The position is set so as not to be equal to or slightly beyond the projecting position of the leg 16. It is assumed that there is no problem in which the front lid 5 contacts the magnet 12 and the leg 16 at the same time.
[0020]
As shown in FIG. 4, when the front lid 5 is attracted and held by the magnet 12, the leg 16 is provided on the main body 14 of the gauge 10, and the leg 16 is A gap is formed between the main body 14 of the gauge portion 10 and the magnet 12 along the axial direction of the pipe pile 2 between the adjacent portions.
This gap is used as a work space 25 when welding between the outer peripheral portion of the front lid 5 and the inner peripheral surface of the distal end portion of the pipe pile 2.
Next, a method of using the mounting jig 1 having such a configuration (a method of mounting the front lid 5 on the pipe pile 2) will be described.
[0021]
First, the front lid 5 is suction-held by the magnet 12 of the mounting jig 1.
Then, the gauge portion 10 is fitted into the distal end portion of the pipe pile 2 such that the front lid 5 comes first, and the annular surface 11a of the stopper portion 11 is brought into contact with the opening edge of the distal end portion of the pipe pile 2.
As a result, the front lid 5 is necessarily positioned at a position inside the tip of the pipe pile 2 by a predetermined amount and so as to be concentric. Further, the surface direction of the front lid 5 is held in a state orthogonal to the axis of the pipe pile 2.
The extent to which the front lid 5 is positioned from the tip of the pipe pile 2 to the inner position can be changed by changing the axial length of the main body 14 in the gauge section 10, but this length is approximately What is necessary is just to set it as about 50 mm.
[0022]
Therefore, a welding rod 30 is inserted from a portion where the opening portion 20 of the stopper portion 11 and the hollow portion 17 of the gauge portion 10 communicate with each other, and a gap is formed between the inner peripheral surface of the distal end portion of the pipe pile 2 and the outer peripheral surface of the front lid 5. Can be welded.
At this time, the welding may be performed in a dotted manner at an appropriate number of locations in the circumferential direction, or may be performed with a length in the circumferential direction. In any case, after this welding, if the mounting jig 1 is removed from the tip of the pipe pile 2, the front lid 5 will be left in the tip of the pipe pile 2. The entire circumference may be welded to the inner peripheral surface of the pipe pile 2.
[0023]
By the way, the present invention is not limited to the above embodiments, and can be appropriately changed according to the embodiments.
For example, the shape of the magnet 12, the support structure by the gauge unit 10, and the like can be appropriately changed.
Further, the gauge portion 10 may be fitted so that the entire periphery thereof comes into contact with the inner peripheral surface of the pipe pile 2.
[0024]
【The invention's effect】
As is clear from the above description, the jig for mounting the pipe pile head cap according to the present invention, when mounting the pipe head into the ground by a predetermined amount inward from the tip end of the pipe pile, This mounting work (welding) can be easily performed while the surface direction of the front lid is orthogonal to the center.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a mounting jig according to the present invention.
FIG. 2 is a plan view corresponding to FIG.
FIG. 3 is a sectional view taken along line AA of FIG. 2;
FIG. 4 is a side sectional view illustrating a state of use based on the state of FIG. 3;
FIG. 5 is a side view showing a pipe pile to which a front lid is attached using the attachment jig.
FIG. 6 is an enlarged sectional view taken along line BB of FIG. 5;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Mounting jig 2 Pipe pile 5 Tip 10 Gauge part 11 Stopper part 12 Magnet 15 Spring except play 23 Stay 25 Work space for welding

Claims (4)

A mounting jig used for mounting a front lid (5) for closing a tip inside a predetermined amount from a tip of the pipe pile (2),
A gauge part (10) which can be fitted to the inner peripheral surface of the tip of the pipe pile (2) at at least three points in the circumferential direction thereof, and this gauge part (10) is connected to the pipe pile (2). ) Is provided on the side of the gauge portion (10) facing the inside of the pipe pile (2), with the stopper portion (11) abutting on the opening edge of the pipe pile (2) when fitted into the distal end portion. A mounting jig for a pipe pile front lid, comprising: a head lid (5); and a magnet (12) for suction. The jig according to claim 1, wherein the gauge portion (10) is formed in a ring shape to fit into the tip of the pipe pile (2) without looseness. The gauge portion (10) is provided with a rattle removing spring (15) at a position in contact with the inner peripheral surface of the distal end portion of the pipe pile (2) so that the inner peripheral surface can be elastically pressed. 3. The jig for mounting a front end for a pipe pile according to claim 1 or 2. The gauge portion (10) has a body portion (14) having a portion that comes into contact with the inner peripheral surface of the tip portion of the pipe pile (2), and projects from the body portion (14) to the inside of the pipe pile (2). A foot portion (16), and the projection between the main body portion (14) and the magnet (12) along the axial direction of the pipe pile (2) in accordance with the amount of protrusion by the leg portion (16). 4. A jig for mounting a front end for a pipe pile according to any one of claims 1 to 3, wherein a working space (25) is secured.

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