JP2761367B2 - End cutting equipment for steel pipe piles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing device for cutting an end portion into a tapered shape in a pile driving operation in order to increase joint strength when connecting steel pipe piles by welding.

[0002]

2. Description of the Related Art Steel pipe piles are usually connected by butt welding. The welding point is not so strong that the conventional endless belt-shaped reinforcing member 37 is attached to the opening of the steel pipe pile 38, and the steel pipe pile 38 is connected via the reinforcing member 37 before welding. I was going. Since the reinforcing member 37 is provided with a projection 39 at the center of the outer surface over the entire circumference,
A gap 40 of several millimeters is formed at the abutting portion of the two steel pipe piles 38, 38 to be welded, and the molten metal flows into the gap 40 to increase the joining strength. Although this method has a high effect on the relatively thin steel pipe pile 38, the thick steel pipe pile 41 is effective.
However, in some cases, only a small gap was provided, and the molten metal did not spread all the way to the back, resulting in insufficient bonding strength. Therefore, when connecting the thick steel pipe piles 41, 41, a tapered portion is provided at the end of the steel pipe pile before being transported to the site so as to ensure that the molten metal reaches all corners of the gap. Measures to form 42 are taken at the factory.

[0003]

However, since the factories for performing such processing are limited, there is a problem that the transportation to the factories and the transportation from the factories to the site are troublesome, and the transportation cost is increased. In some cases, the thinned end portion is deformed during transportation.

[0004] The present invention has been made in view of the above circumstances, and is a steel pipe pile that can be easily processed on site by directly utilizing the functions of the equipment existing on site after being directly sent from the manufacturer to the site. The purpose of the present invention is to provide an end cutting device.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an end cutting device for a steel pipe pile according to the present invention is provided at a center of a holder which is non-rotatably mounted on a vibration-preventing device of a rotary pile driver. A base body provided with a hole, fixing the bearing so that the shaft hole is positioned in the extension direction of the hole, and supporting a feed screw in the shaft hole so as to be rotatable and non-retractable; and A movable body that moves up and down without rotating, and the movable body has a detachable sliding guide that moves forward and backward in the hollow portion of the extension pile at the tip of a guide shaft that advances and retracts along the hole of the holder. And the blade base is fixed to the intermediate portion of the guide shaft so as to be non-rotatable.The sliding guide is fixed so as to share the center axis with the guide shaft and the blade base. The cutting blade is on a virtual plane orthogonal to the central axis,
A screw hole for screwing with the feed screw is formed in the center of the guide shaft along the center axis at substantially the same distance from the center axis.

In some cases, deceleration braking means is interposed between the shaft hole and the feed screw. In some cases, a mortar-shaped recess is provided on the end face of the head of the feed screw, and a tailstock provided with a mandrel abutting the recess is provided. In this case, the mandrel is provided at the upper end of the inherited pile. Is fixed to the fixed plate that fits in such a manner that the projected length can be adjusted while sharing the central axis with the inherited pile.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an apparatus for cutting an end of a steel pipe pile according to the present invention. The end cutting device for a steel pipe pile according to the present invention is mounted on the vibration-reducing device 2 of the rotary pile driver 1, and the extension pile 11 mounted on the auger 24 of the rotary pile driver 1 is rotated by a hydraulic motor. By gradually raising the cutting blade 16 with the stopping device 2 as a base, the lower end of the extended pile 11 is cut.

The end cutting device comprises a base 8 and the base 8
And a movable body 9 that moves up and down without rotating. The base 8 is provided with a hole 4 in the center of the holder 3 sandwiched by the vibration-preventing device 2 and integrally fixes the bearing 6 so that the shaft hole 5 is located in the extension direction of the hole 4.
The feed screw 7 is rotatably and irreversibly supported in the shaft hole 5, and the movable body 9 is extended to the tip of the guide shaft 10 which advances and retreats along the hole 4 of the holder 3, and the hollow of the pile 11 is formed. A sliding guide 13 that advances and retreats at the portion 12 is detachably fixed, and a blade base 14 is fixed to an intermediate portion of the guide shaft 10.

The feed screw 7 has a male screw formed at the tip thereof, and a base formed with a prism-shaped head for attaching a handle 25 for turning the feed screw 7 to the base. In addition, the sectional shapes of the hole 4 of the holder 3 and the guide shaft 10 are as follows.
Set in a polygonal shape or a gear shape that fits each other,
At the center of 4, a hole 26 having the same sectional shape as the hole 4 of the holder 3 and the guide shaft 10 is formed. That is, the guide shaft 10 non-rotatably slides along the hole 4 of the holder 3, and even when the blade base 14 passes through the intermediate portion of the guide shaft 10, the blade base 14 rotates with respect to the guide shaft 10. I will not do it. Then, the tightening screw 2 whose front end contacts the peripheral surface of the guide shaft 10 on the blade base 14.
7, the sliding of the blade base 14 along the guide shaft 10 is prevented. If a recess is provided on the surface of the guide shaft 10 where the tip of the tightening screw 27 abuts, the sliding of the blade base 14 is achieved. Movement prevention is more complete. Furthermore, the guide shaft 10 has its center shaft 15
A screw hole 17 having a female screw thread to be screwed with the leading end of the feed screw 7 is formed along the hole, and the sliding guide 13 has a diameter of the hollow portion 12 of the extension pile 11 having different sizes. A plurality of pillar-shaped or impeller-shaped members are provided in accordance with the size of the extension shaft 11 and the one that matches the size of the extension pile 11 to be used is fixed to the tip of the guide shaft 10.

Thus, the hole 4, the shaft hole 5, the feed screw 7, the guide shaft 10, the blade base 14, and the slide guide 13 of the holder 3 share a central axis 15 with each other. By arranging a plurality of equal cutting blades 16 at substantially equal positions on the virtual plane orthogonal to the central axis 15 at positions equidistant from the central axis 15, the respective cutting blades 16 always receive an even load. While being added, the lower end portion of the pile 11 is abutted, and cutting is preferably performed with the rotation of the pile 11.

The shape of the cutting blade 16 is such that it has a blade portion 28 inclined from the outside to the inside with respect to the central axis 15, and further extends inward to abut on the lower end surface of the pile 11 to limit cutting. Are formed. The blade portion 28 generally faces the extending direction of the pile 11 and forms a slightly recessed rake portion 41 on the front surface and a relief portion 30 on the rear surface. Regarding the mounting of the blade base 14 and the cutting blade 16, a groove 31 for mounting the cutting blade 16 on the blade base 14 in advance.
The cutting blade 16 is extended in the range of the groove 31 and is fixed after being positioned according to the size of the pile 11.
Further, for a thick pile, a jig 34 capable of slidably attaching the cutting blade 33 to the moving guide 32 inclined from the outside to the inside with respect to the center axis 15 may be used. Blade rest 14
As a fixing means of the cutting blade 16 and the cutting table 14 and the jig 34, and the jig 34 and the cutting blade 33, screwing or fastening with a screw may be considered.

On the other hand, the handle 2 attached to the feed screw 7
If the load when rotating 5 is not uniform, when the load is suddenly reduced, an excessive force is applied and the cutting blades 16 and 33 tend to bite deeply. Therefore, the cutting blades 16 and 33 are interposed between the shaft hole 5 and the feed screw 7 by decelerating braking means 18 using, for example, magnetism so that a uniform load is applied when the feed screw 7 is turned. The breakage of the steel is suppressed to prevent breakage.

Also, the central axis of the inherited pile 22 (not shown)
In some cases, a tailstock 21 is additionally provided so that the center axis 15 of the pile 11 coincides with that of the pile 11. That is, a mortar-shaped concave portion 19 having a centripetal inclined surface is provided on the end surface of the feed screw 7, and a mandrel 20 is inherited so as to fit into the concave portion 19, and the plate is set up along the central axis of the pile 22. A cylindrical penetrating portion 35 that fits with the opening is vertically provided on the back surface of the body to form the fixing plate 23, and a through hole (not shown) is formed at the center of the fixing plate 23, and the mandrel 20 is length-adjusted. The tailstock 21 freely inserted is added to the pile 2
2 is mounted on the upper opening. As a method for fixing the mandrel 20, the diameter of the through hole formed at the center of the fixing plate 23 is set to be substantially equal to the diameter of the mandrel 20, and the male screw 42 is formed at the base of the mandrel 20. A method of screwing the support member 43 having a flat bottom on the upper surface may be adopted, and a female screw screwing with the mandrel 20 may be formed in the through hole of the fixing plate 23. By providing the tailstock 21, the position of the central axis of the added pile 22 can be clearly seen, and the rotating shaft 15 of the added pile 11 is stabilized, so that the processing accuracy and safety are enhanced. . On the peripheral surface of the support member 43, for convenience in rotating, a lateral hole 36 may be formed from three or four directions toward the center, or the support member 43 itself may be formed into a hexagon like a nut. It may be molded.

[0014]

As described above, the use of the steel pipe pile end cutting device according to the present invention makes it possible to easily process the extended pile using the on-site rotary pile driving machine. Not only can the trouble of transportation related to the end processing be eliminated, but also the transportation cost can be reduced, and also the problem that the end of the processed steel pipe pile becomes deformed during transportation can be solved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing an example of an end cutting device for a steel pipe pile according to the present invention.

FIG. 2 is a plan view showing an example of a blade base of the end cutting device for a steel pipe pile according to the present invention.

FIG. 3 is a side view showing an example of a tailstock of the end cutting device for a steel pipe pile according to the present invention.

FIG. 4 is a rear view showing an example of a tailstock of the end cutting device for a steel pipe pile according to the present invention.

FIG. 5 is a partially cutaway side view showing an example of a joint portion of a steel pipe pile.

FIG. 6 is a partially cutaway side view showing an example of a joint portion of a steel pipe pile.

FIG. 7 is a side view showing a similar example of a cutting blade of the steel pipe pile end cutting device according to the present invention.

FIG. 8 is a view showing the use of the end cutting device for a steel pipe pile according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Rotary pile driver, 2 Shake prevention device 3 Holder, 4 Drilling hole, 5 shaft hole, 6 shaft bearing, 7
Feed screw 8 base, 9 movable body 10 guide shaft 11 extension pile, 12 hollow portion, 13 sliding guide 14 blade base 15 center axis 16 cutting blade 17 screw hole 18 deceleration braking means 19 recess, 20 mandrel, 21 core Push table 22 Inherited pile, 23 Fixing plate

Claims (3)

(57) [Claims] 1. A hole (4) is provided in the center of a holder (3) which is non-rotatably mounted on a vibration-preventing device (2) of a rotary pile driver (1), and a shaft is provided in the extension direction of the hole (4). A base body (8) having a bearing (6) fixed so that the hole (5) is located, and a feed screw (7) rotatably and non-removably supported in the shaft hole (5); A movable body (9) that moves up and down without rotating with respect to the base (8), wherein the movable body (9) has a hole (4) in the holder (3).
A sliding guide (13) which advances and retreats in a hollow portion (12) of the extension pile (11) is detachably fixed to the tip of a guide shaft (10) which advances and retreats along the guide shaft (1).
The sliding guide (13) comprises a guide shaft (10) and a blade base (1).
4) and the central axis (15) are shared so that a plurality of cutting blades (16) are mounted on the blade base (14).
The guide shaft (1) is disposed almost evenly at a position equidistant from the central axis (15) on a virtual plane orthogonal to 5).
An end cutting device for a steel pipe pile, wherein a screw hole (17) for screwing with the feed screw (7) is formed in the center of (0) along the central axis (15). 2. An end cutting device for steel pipe piles according to claim 1, wherein a deceleration braking means (18) is interposed between the shaft hole (4) and the feed screw (7). 3. A mortar-shaped recess (19) is provided on the end face of the head of the feed screw (7), and a tailstock (21) having a mandrel (20) abutting on the recess (19) is provided. 3. An end cutting device for a steel pipe pile according to claim 1, wherein the mandrel (20) is connected to a fixing plate (23) which is fitted to an upper end of the added pile (22). Addition pile (22) and center axis (1
(5) An end cutting device for a steel pipe pile, which is fixed so as to be able to adjust a protruding length while sharing (5).