JPH093880A - Site correction method for thin steel pipe pile correction jig used therefor - Google Patents

Abstract

PURPOSE: To perform accurate contact of two piles with each other by a method wherein, in a coupling part between the lower pile and the upper pile of a thin steel. pipe pile, irregularity between the upper and lower piles is corrected before connection of the two piles. CONSTITUTION: An annular ring 4 having an inner periphery with size larger than the outside diameter of an upper pile 2 and a correction jig 3 positioned facing the annular ring in the direction of diameter and radially joined in a screwed-in state with the ring 4 and comprising a plurality of correction bolts 5 having a tip protruding toward the inner peripheral side of the ring 4 are temporarily fixed on the outer periphery of the upper end of the lower pile 1 in such a state to protrude upward from the top end of the lower pile 1. The tips of the correction bolts 5 of the correction jig 3 are brought into abutment with the outer peripheral surface of the upper pile 2 dropped on the lower pile 1 and the sectional shape of the upper pile 2 is corrected to the same shape as that of the lower pile 1, and the lower end face of the upper pile 2 is brought into contact with the upper surface of the lower pile 1 throughout a whole periphery.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-site straightening method and a straightening jig for a thin-walled steel pipe pile in which the cross-sectional shape of the upper pile is straightened at the joint portion of the thin-walled steel pipe pile to match the lower pile.

[0002]

The connection of steel pipe piles in the field is performed by dropping the upper pile on the lower pile installed in advance and welding the joint joint. The joint needs to be accurately butted over the entire circumference in order to transmit the load.

In the case where the steel pipe pile is thinned in view of economical design or by being compounded with concrete filled inside, it is deformed in the radial direction due to its own weight during transportation and handling, and remains as it is. Although it is necessary to correct the deformation before connecting the lower pile and the upper pile, the correction is conventionally inefficient because it is performed using a wedge after installing the upper pile, which is a safety management problem. There is also.

On the other hand, the applicant has proposed a simple correction method using a funnel-shaped correction jig (Japanese Patent Application No. 6-89347).
issue). This is a method of correcting the shape by the reaction force received on the center side of the ellipse when both lower ends in the long axis direction of the upper pile that are deformed into an ellipse contact the inner peripheral surface of the correction jig. As the diameter increases, the amount of deformation increases, and if you try to give the corrective jig a corresponding diameter, the inclination angle will become loose, so if the pile diameter becomes a certain size, the lower end of the upper pile will become the inner circumference of the correction jig. It may not hit the surface and descend.

The present invention has been made in view of the above background, and proposes a method capable of correcting more accurately while solving the problems of the invention of the previously filed application.

[0006]

According to the present invention, the upper pile is forcibly corrected in the radial direction by using a correction bolt that is screwed into a ring that is temporarily fixed to the lower pile and has a tip protruding toward the inner peripheral side of the ring. By doing so, the accuracy of contact between the lower end surface of the upper pile and the upper end surface of the lower pile is increased, and the situation in which the upper pile does not fall on the lower pile due to its deformation is avoided.

The correction jig is temporarily fixed to the outer periphery of the upper end of the lower pile in a state of protruding upward from the top end of the lower pile, and the inner ring has an annular ring having a size larger than the outer diameter of the upper pile and the straightening jig. The straightening bolt is formed of a bolt and is radially engaged with the ring so as to face the diametrical direction of the lower pile, and the tip projects toward the inner peripheral side of the ring.

Since the tip of the straightening bolt strikes the outer peripheral surface of the upper pile dropped into the inner circumference of the ring in the radial direction, the straightening bolt forms a pair with the straightening bolt that is diametrically opposed to force the cross-sectional shape of the upper pile. Correct the same as the lower pile. If one of a pair of straightening bolts facing each other in the diameter direction is screwed into the center side, the straightening bolt on the opposite side pushes back the upper pile with a reaction force, so the upper pile extends beyond the circle at the upper end of the lower pile. If the straightening bolts are arranged facing each other, the upper pile can be efficiently straightened.

The upper pile is usually deformed into an elliptical shape when it is suspended on the lower pile, but the size of the inner circumference of the ring of the correction jig is set to be larger than the outer diameter of the upper pile in the deformed state. As a result, the lower ends of both ends in the major axis direction where the outer diameter becomes the largest are located on the inner peripheral side of the ring. Further, since it is not necessary to incline the inner circumference of the ring, the upper pile is dropped over the entire circumference of the inner circumference of the ring without causing a collision with the ring, and the problem of the previously filed invention is solved. As mentioned above, the elliptical upper pile is surely modified into a circular shape because both ends in the long axis direction are pushed toward the center by the correction bolts in that position, and at the same time, both ends in the short axis direction protrude outward in the radial direction. .

Since the straightening bolt forcibly corrects the cross-sectional shape of the lower end of the upper pile, the accuracy at the time of contact between the lower end surface of the upper pile and the upper end surface of the lower pile is increased, and the lower end surface of the upper pile is placed above the lower pile. It is possible to make contact with the end face over the entire circumference.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is the same as the thin steel pipe pile, in which the upper pile 2 of the same diameter is dropped on the lower pile 1 which is a thin steel pipe pile, and both piles are formed by using the straightening jig 3 of the invention according to claim 2. 1,2
Is a method of correcting the misalignment of the upper pile 2 and the lower pile 1 before the connection by welding.

As shown in FIG. 2, the straightening jig 3 is composed of an annular ring 4 and a plurality of straightening bolts 5 screwed onto the ring 4. The straightening jig 3 is attached to the outer periphery of the upper end of the lower pile 1 from the top end of the lower pile 1. It is temporarily fixed while protruding upward. Inner circumference of ring 4 is upper pile 2
Has a size larger than the outer diameter (in the case of a circular shape, the inner diameter is larger than the outer diameter of the upper pile 2 in a deformed state), and the correction bolts 5 face the diameter direction of the lower pile 1 in the radial direction of the ring 4. It is screwed, and the tip projects to the inner peripheral side of the ring 4. The plane shape of the ring 4 is preferably circular, but there is no problem if the axis of the straightening bolt 5 faces the center of the lower pile 1 as shown in FIG. The plurality of straightening bolts 5 are evenly arranged in the circumferential direction of the ring 4.

The embodiment shows a case where eight straightening bolts 5 are attached to the ring 4 so that the upper pile 2 can be straightened at a fixed position regardless of the deformed elliptical shape of the upper pile 2. The straightening bolts 5 diametrically oppose each other on the circumference along the ring 4, and if arranged in pairs, push both ends in the major axis direction of the ellipse toward the center side to push both ends in the short side direction outward from the center. Since the deformed shape of the upper pile 2 can be corrected into a circular shape, the circular shape of the lower pile 1 faces each other, and at least 2
It is enough if the books are arranged.

The straightening bolt 5 is screwed directly to the ring 4 in the radial direction, or is passed through the ring 4 and is screwed to a nut 6 fixed to the inner peripheral surface of the ring 4 by welding or the like, so that the ring 4 or the nut 6 is screwed. The amount of protrusion of the tip from the inner peripheral surface of the ring 4 is adjusted by adjusting the screwing length to the.

The tip of the straightening bolt 5 abuts the outer peripheral surface of the upper pile 2 dropped on the lower pile 1 toward the center of the upper pile 2 in the radial direction, and at the same time, is located on the opposite side.
Corrects the cross-sectional shape of the upper pile 2 to be the same as the lower pile 1 by applying a reaction force to the upper pile 2 toward the center of the circle, and the lower end of the upper pile 2 contacts the upper end of the lower pile 1 over the entire circumference. Let A groove for welding with the lower pile 1 is formed on the outer peripheral side of the lower end of the upper pile 2.

A backing ring 7 for welding with the upper pile 2 is supported on a stopper 8 on the inner peripheral surface of the upper end of the lower pile 1, and is arranged in a state of protruding upward from the top end of the lower pile 1. However, the backing ring 7 applies a reaction force to the upper pile 2 from the inner peripheral side in the opposite direction to the force from the straightening bolt 5 in the radial direction when correcting the upper pile 2 to move and straighten the upper pile 2. It works to restrain excessive deformation of time. The upper part of the backing ring 7 bends toward the center of the circle, and when the upper pile 2 is dropped, it is inscribed in the upper pile 2 to guide the lowering of the upper pile 2 as the shape correction by the straightening bolts 5 progresses, thereby ensuring verticality. Also has the role of holding.

When the upper pile 2 is dropped by bending the upper part of the backing ring 7, both ends of the lower end of the upper pile 2 which are deformed in an elliptical shape in the short axis direction come into contact with the upper end of the backing ring 7 and are long. Both ends in the axial direction are located on the outer peripheral side of the backing ring 7. After that, straightening bolts 5, which strike both ends in the long axis direction,
As the cross-sectional shape of the upper pile 2 is corrected to a circular shape by the correction of 5, the upper pile 2 gradually contacts the upper portion of the backing ring 7 and is guided by the backing ring 7 as it is to the lower pile 1 by its own weight. Descend to the top. When a force is applied from the both ends in the long axis direction of the upper pile 2 which is deformed into an elliptical shape to the center side by the correction bolts 5, the upper pile 2 is lowered and the inner peripheral surface of the upper pile 2 is backed by the backing ring
The completion of the straightening work is confirmed by the contact with the contact point, and the timing can be confirmed when the tightening force (torque) of the straightening bolt 5 changes.

The straightening jig 3 is placed on a receiver 9 which is detachably attached to the outer periphery of the upper end of the lower pile 1 and surrounds the upper pile 2. In the embodiment, the case where a plurality of independent receivers 9 are detachably attached to the lower pile 1 by using the magnets 10 is shown, but the receivers 9 are placed in a state in which the correction jig 3 can be horizontally stabilized and supported. The mounting method does not matter as long as it is temporarily fixed to the pile 1. As described above, if one of the pair of diametrically opposed straightening bolts 5, 5 is screwed into the center side and the outer peripheral surface of the upper pile 2 is pressed, the straightening bolt 5 on the opposite side reacts with the upper pile by reaction force. Since the ring 4 is pushed back, the ring 4 does not move relatively by screwing the straightening bolt 5, so that the straightening jig 3 does not need to be fixed to the receiver 9.

The ring 4 of the orthodontic jig 3 is divided into two or more ring members 40, 40 by being separated at about two locations in the circumferential direction for the convenience of attachment and detachment around the upper pile 2, and the ring members 40, 40 are The hinge 11 is openably and closably connected at one separation position, and the connection and disconnection are freely connected at the other position.

3 to 8 show ring members 40, 40 divided into two parts.
An example of connection is shown. 3 and 4, the stoppers 13 rotatably supported by the pins or bolts 12 on one ring member 40 are overlapped on the other ring member 40, and the pins 14 are dropped into the ring members 40 to connect them. 5 and 6 show that the stopper 13 is slidably supported by one ring member 40 and is connected to the other by a pin 14 as in FIG. 3, and FIGS. This is a case where the materials 40, 40 are combined so as to overlap each other on a plane, and the pin 14 is penetrated through the overlapping portion to be connected.

[0021]

According to the first aspect of the present invention, an annular ring, which is temporarily fixed to the lower pile and has an inner circumference larger than the outer diameter of the upper pile, is screwed in the radial direction so as to face the diameter. Since it is a method of forcibly correcting the upper pile in the radial direction by abutting a correction bolt protruding on the inner peripheral side of the ring on the outer periphery of the upper pile,
It is possible to reliably correct the cross-sectional shape of the upper pile to a circular shape, which increases the accuracy of the contact between the lower end surface of the upper pile and the upper end surface of the lower pile,
The lower end surface of the upper pile can be brought into contact with the upper end surface of the lower pile over the entire circumference.

The collision between the upper pile and the ring can be avoided by making the ring have a size that allows for the distance between both ends of the upper pile deformed into an elliptical shape in the long axis direction. Since there is no need to attach it, it is possible to prevent the situation in which the upper pile does not descend due to deformation, and the problem of the previously filed invention is solved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a mounting state of a correction jig.

FIG. 2 is a plan view of FIG.

FIG. 3 is a plan view showing an example of connecting the rings using a stopper.

FIG. 4 is an elevational view of FIG.

FIG. 5 is a plan view showing an example of connecting the rings using a stopper.

FIG. 6 is an elevational view of FIG.

FIG. 7 is a plan view showing an example of connecting rings using pins.

FIG. 8 is an elevational view of FIG.

[Explanation of symbols] 1 ... Lower pile, 2 ... Upper pile, 3 ... Straightening jig, 4 ... Ring, 40 ... Ring material, 5 ... Straightening bolt, 6 ... Nut, 7 ... Back Abutment ring, 8 ... Stopper, 9 ... Receiver, 10 ... Magnet, 11 ... Hinge, 12 ... Bolt, 13 ... Stopper, 14 ... Pin.

Front page continuation (71) Applicant 000001258 Kawasaki Steel Co., Ltd. 1-228 Kitahonmachi-dori, Chuo-ku, Kobe-shi, Hyogo (71) Applicant 000002118 Sumitomo Metal Industries, Ltd. 4-chome Kitahama, Chuo-ku, Osaka-shi, Osaka No. 33 (72) Inventor Setsu Yoshida 3-13-3 Nihombashi Muromachi, Chuo-ku, Tokyo Kubota Co., Ltd. Tokyo headquarters (72) Inventor Yoichi Yokoyama 3- 1-3 Nihombashi Muromachi, Chuo-ku, Tokyo Kubota Co., Ltd. (72) Inventor Shuzo Watanabe 2-3-3 Uchisaiwaicho, Chiyoda-ku, Tokyo Hibiya International Building Kawasaki Steel Corporation (72) Inventor Shinichi Kawashima 4-53 Kitahama, Chuo-ku, Osaka-shi, Osaka No. Sumitomo Metal Industries, Ltd. (72) Inventor Yasuki Takeichi, Marunouchi, 1-2, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor, Hiroshi Okada 2-3-6, Otemachi, Chiyoda-ku, Tokyo Within Nippon Steel Corporation

Claims (2)

[Claims] 1. A method of dropping an upper pile having the same diameter as that of a thin steel pipe pile on a lower pile which is a thin steel pipe pile to correct the misalignment of the lower pile of the upper pile before connecting both piles. An annular ring having a size larger than the outer diameter of the upper pile, and a plurality of straightening bolts that face the diameter of the lower pile and are screwed into the ring in the radial direction, and the tips project toward the inner peripheral side of the ring. Temporarily fix the straightening jig consisting of on the outer periphery of the upper end of the lower pile while protruding upward from the top end of the lower pile, and fix the straightening bolt of the straightening jig on the outer peripheral surface of the upper pile dropped on the lower pile. A method for straightening a thin-walled steel pipe pile by abutting the tip of the pile to straighten the cross-sectional shape of the upper pile to be the same as that of the lower pile and contact the lower end surface of the upper pile with the upper end surface of the lower pile over the entire circumference. 2. An annular ring used in the method according to claim 1, which is temporarily fixed to the outer circumference of the upper end of the lower pile and has an inner circumference larger than the outer diameter of the upper pile, and the diameter of the lower pile. A straightening jig consisting of a plurality of straightening bolts, which face each other in the radial direction and are screwed into the ring in a radial direction and whose tips project toward the inner peripheral side of the ring.