JP2002348861A - Steel parts for steel piles - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To easily and cost-effectively manufacture a steel pile having wings and tip blades, and yet to provide a mechanically reasonable and reasonably structured steel pile. Provide a steel part for piles that can be manufactured. SOLUTION: A pipe portion 8, a tip blade 4, and a wing 5 connected to a pile body steel pipe 2 are integrally provided by casting. The thickness of the wing 5 on the outer peripheral end 11 side is smaller than the thickness of the inner peripheral end 12, and the pipe portion 8 is thickened 13 by casting in the boundary region with the wing 5. The reinforcing rib 9 is provided integrally with the pipe portion 8 by casting, and the thread portion 6 for screwing connection with the pile body steel pipe 2 is formed on the pipe portion 8 by casting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a steel part for a steel pile.

[0002]

2. Description of the Related Art For example, as a steel pipe pile for rotary press-fitting, a tip of a steel pipe, that is, a lower end thereof is provided with a cutting edge for excavation, or a steel pipe at a tip portion or a middle portion in a longitudinal direction to increase a supporting force. Are provided. Conventionally, this steel pipe pile was manufactured by using a steel plate for a tip blade and a wing, and this was welded to a pile body steel pipe at a factory or a pile driving site to be manufactured and used for pile driving. .

[0003]

However, as described above, in order to manufacture a steel pipe pile, it is necessary to cut out a tip blade or a wing from a steel plate as a component of the pile.
In addition, these parts must be welded to the long pile body steel pipe, which requires labor and costs.

[0004] In addition, since a large force is applied to the inner peripheral end side of the wing and the portion where the wing and the tip blade are joined in the pile body during the pile driving process, it is necessary to ensure that this portion can withstand it. No.

[0005] However, since the wing is made of a steel plate as described above, if the thickness at the inner peripheral end is set to be large, the thickness at the outer peripheral end also becomes large, and the wing of the wing is enlarged. The outer peripheral end side was designed excessively in strength, which sometimes acted harmfully.

[0006] In addition, it is necessary to reinforce the pile body pipe in the area where the wings and the tip blades are attached. Therefore, ribs made by cutting a steel plate are required.
In some cases, it is necessary to install and weld inside the steel pipe portion to which the wings and the tip blade are joined, which makes the production troublesome.

[0007] In view of the above-mentioned conventional problems, for example, the present invention can easily and cost-effectively manufacture a steel pile having wings and tip blades, and yet is mechanically wasteful. Another object of the present invention is to provide a steel part for piles that can be manufactured on a steel pile having a reasonable and reasonable structure.

[0008]

SUMMARY OF THE INVENTION The object of the present invention is to provide a steel material characterized in that a core connected to a steel pile main body and a tip blade and / or a wing are integrally formed by molding by casting. Solved by steel parts for piles.

The steel pile component has a core connected to the steel pile main body, and has a structure in which the core has a tip blade and / or a wing. By connecting the core of this part to the steel pile main body instead of joining it to the main body, the steel pile can be provided with a tip blade or wing,
A steel pile having a tip blade and a steel pile can be easily manufactured.

In addition, in this pile component, a core portion,
Since the tip blade and / or the wing are integrally provided by molding by casting, in the production of this part, cutting, processing, welding, etc. from a steel plate are eliminated, and the production of this part is facilitated. It can be performed cost-effectively.

As described above, according to the steel pile component, the component itself can be easily manufactured, and the steel pile can also be easily manufactured using the component. And a steel pile having a tip blade can be easily and cost-effectively manufactured.

In addition, since it is a cast product, the degree of freedom in shape and structure design is high, and the tip blade, wing, and core are not wastefully and reasonably strong in strength, and have an optimum shape and structure according to soil characteristics. , And an effective pile driving can be realized.

In the above-mentioned component, when a blade is provided, it is preferable that the thickness of the blade at the outer peripheral end is set to be smaller than the thickness at the inner peripheral end. Such sizing is difficult when wings are manufactured by cutting or processing from a steel plate, and can be easily realized only when the parts are made of cast products. A component having wings with appropriate dimensions can be easily manufactured without trouble. By setting such dimensions, it is possible to design and manufacture a blade having a rational structure that is not wasteful and reasonable in strength, and that an effective pile driving can be realized.

In the above-mentioned parts, when the core portion is formed of a tube portion and the wall portion is thickened by casting in a boundary region with the blade, the boundary between the tube portion and the blade tends to concentrate stress. Can be effectively reinforced locally from the side of the pipe portion, and a component having a reasonable and reasonable structure can be easily realized.

In the above-mentioned parts, when the core portion is formed of a tube portion and the reinforcing rib is provided integrally with the tube portion by molding by casting, the tube portion is effectively formed by the reinforcing rib. A component having such a reinforcing rib can be easily manufactured by casting without cutting out or welding from a steel plate.

Further, in the above-mentioned component, when the screw portion for screwing connection with the pile main body is integrally formed by casting, the above-mentioned pile component provided with such a screw portion is replaced with a screw portion. It can be manufactured with high precision and extremely easily, and troublesome thread cutting can be eliminated. In addition, because of the casting, the screw portion can be easily provided on the component itself. In addition, the connection between the above-mentioned parts and the pile body is made by screws, so that the pile body and the parts can be connected with good workability even at the site, and the pile at the site can be connected. The hammering operation can be performed efficiently, and the connection can be easily made on-site, so that the piles can be efficiently transported to the site without taking up space.

Further, in the above-mentioned pile, when a fitting portion for welding connection with the pile body is formed integrally with the core portion by casting, the core portion is fitted to the pile body to thereby form the pile body. And the component can be easily welded, and yet a component having such a fitting portion can be easily manufactured.

[0018]

Next, embodiments of the present invention will be described with reference to the drawings.

The steel pile 1 of the first embodiment shown in FIG. 1 is made of a steel pipe pile for rotary press-fitting. In this steel pipe pile 1, reference numeral 2 denotes a steel pipe as a pile main body, and reference numeral 3 denotes a pile part of the present invention. This is a steel pile tip part. In the present embodiment, the pile tip part 3 is provided with a tip blade 4 for excavation and a wing 5, and the pile tip part 3 and the pile body steel pipe 2 are connected with screws 6, 7.
It is structured to be connected by.

In the above-mentioned pile tip part 3, reference numeral 8 denotes a pipe as a core, and the tip blade 4 is provided on the pipe 8, and is provided so as to protrude more distally than the pipe 8. Reference numeral 9 denotes a reinforcing rib, reference numeral 10 denotes a bottom plate, reference numeral 6 denotes a male screw portion, and the pile tip part 3 is a cast steel product in which all of these components including the wing 5 are integrally formed by casting.

The wing 5 is intended to expand the bottom and the like.
The tube portion 8 is provided so as to protrude laterally from the outer peripheral portion.
In the present embodiment, as the blade 5, as shown in FIG. 1A, a spiral extending substantially over the entire circumference of the tube 8 by a pair of divided spiral blades 5 a extending around the outer periphery of the tube 8 about halfway. Wings are employed.

The thickness of the blade 5 on the outer peripheral end 11 side is made smaller than the thickness of the inner peripheral end 12 side. The pipe section 8 is formed so that its wall thickness is larger than the wall thickness of the pile main body steel pipe 2, and at the boundary 13 with the wing 5, the pipe section 8 swells into the pipe section 8. It is reinforced by a cross-shaped reinforcing rib 9 provided inside. In addition, male screw part 6
Is provided at the base end of the tube portion 8.

The above-mentioned pile tip part 3 can be integrally formed by using, for example, the lost wax method, etc., even if it has such a structure, and can be easily manufactured. Unlike the prior art, there is no need for troublesome operations such as cutting, processing, and welding from a steel plate, and the pile tip part 3 can be manufactured easily and cost-effectively.

A female screw part 7 corresponding to the male screw part 6 of the pile tip part 3 is attached to the end of the pile main body steel pipe 2 by welding. The female screw part 7 may be a cast product or may be manufactured by another processing method such as thread cutting since the screw portion is a main structural part.

The steel pipe pile 1 is manufactured by using the above-mentioned pile tip part 3 and connecting the male screw part 6 provided at the base end of the pipe part 8 to the female screw part at the end of the pile body steel pipe 2. 7 can be easily manufactured only by screwing them together.

As described above, according to the pile tip part 3,
This part 3 itself can be easily manufactured, and
The steel pipe pile 1 can also be easily manufactured by using the part 3, whereby the steel pipe pile 1 provided with the wing 5 and the tip blade 4 can be manufactured easily and cost-effectively.

In addition, since the pile tip part 3 is made of a cast steel product manufactured by integral molding by casting as described above, the design flexibility of the tip blade 4 and the wing 5 is high, and the tip blade 4 The wing 5 can be easily manufactured to have an optimal structure according to the soil quality, and effective pile driving can be realized.

Particularly, in the present embodiment, the thickness of the wing 5 on the outer peripheral end 11 side is set to be smaller than the thickness of the wing 5 on the inner peripheral end 12 side. Even the tip part 3 can be easily manufactured, and by setting such dimensions, it is possible to design and manufacture a steel pipe pile having a reasonable structure that is not wasteful and reasonable in strength, Effective stakeout can be realized.

Further, in the above-mentioned pile tip part 3, the pipe 8 is thickened in the boundary region with the wing 5, and the boundary between the pipe and the blade where the stress tends to concentrate is effectively formed from the pipe 8 side. In addition, such reinforcement by thickening can be easily realized by casting.

In the above-mentioned pile tip part 3, the pipe part 8
Are reinforced by internal reinforcing ribs 9 and the reinforcing ribs 9 are integrally provided with the pipe 8 by molding by casting. Therefore, a pile tip component provided with such reinforcing ribs 9 is cut out from a steel plate. It can be manufactured easily without performing welding or welding. The bottom plate 10 can also be easily provided in the pipe portion 8 without cutting out or welding from a steel plate.

Further, in the above-mentioned pile tip part 3, since the screw part 6 for connecting to the pile body steel pipe 2 is integrally provided at the base end of the pipe part 8 by casting, such a part is provided. The component 3 having the screw portion 6 can be manufactured with high precision and extremely easily in the screw portion, and troublesome thread cutting or the like can be eliminated. And because it's casting,
The thread portion 6 can be easily provided on the pile tip component itself.

The screw connection between the pile tip part 3 and the pile main body steel pipe 2 may be performed in advance at a factory or may be performed at a pile driving site. When the connection is performed on site, the connection can be performed efficiently, and the pile can be transported efficiently without taking up space.

The steel pipe pile 1 of the second embodiment shown in FIG. 2 has a structure in which a pile tip part 3 and a pile main body steel pipe 2 are joined by welding. That is, the circular fitting portion 14 that fits snugly into the end of the pile body steel pipe 2 at the base end of the pile tip component 3.
And an annular step portion 15 for contacting the end face of the pile main body steel pipe 2 in the fitted state. The annular step section 15 is formed on a groove slope. 2
, And the pile tip part 3 and the pile main body steel pipe 2 are joined by welding. In the present embodiment, not only the fitting portion 14 but also the step portion 15 and the like are integrally formed by casting for manufacturing the pile tip part 3.

As described above, since the fitting portion 14 and the like for welding connection with the pile main body steel pipe 2 are integrally formed on the pipe portion 8 of the pile tip part 3 by casting, it can be easily formed. Further, by fitting the pipe portion 8 of the pile tip part 3 to the pile body steel pipe 2, the pile body steel pipe 2 and the pile tip part 3 can be easily welded. In addition, the fact that the tip blade 4, the wing 5, the reinforcing means 9, 13 and the like are provided is the first.
This is the same as in the embodiment.

The steel pipe pile 1 of the third embodiment shown in FIG. 3 has a structure in which a pile tip part 3 and a pile body steel pipe 2 are joined by screws 6 and 7, and a tip blade 4 is provided. The wing is omitted.

The steel pipe pile 1 of the fourth embodiment shown in FIG. 4 has a structure in which a pile tip part 3 and a pile body steel pipe 2 are joined by welding in the same manner as in the second embodiment described above. 4 is provided, but has a structure in which the wings are omitted.

The steel pipe pile 1 of the fifth embodiment shown in FIG. 5 is provided with a wing 5 also at an intermediate portion in the longitudinal direction of the pile. The pile intermediate part 16 for that purpose is provided with a pipe part 8 as a core part and a wing 5 provided on the outer peripheral part so as to protrude laterally, and in addition, a wing boundary thickening part on the pipe part 8 side. 13 and
Reinforcing ribs 9 and the like in the pipe portion 8 are also provided, and the wing 5 has a thickness dimension on the outer peripheral end 11 side smaller than a thickness dimension on the inner peripheral end 12 side, and the whole is integrally formed by casting. Is formed. However, since the present invention relates to the wing provided at the middle part in the length direction of the pile, the middle part 16 of the pile does not include the tip blade 4 as in the case of the tip part 3 of the pile. In the present embodiment, screw parts 6 and 6 are provided by integral casting at both ends of the pile intermediate part 16. The components 16 are connected by screwing. Note that the threaded portions 6 and 6 on the side of the pile middle part 16 are also provided integrally with the pile middle part 16 by molding by casting. If connecting with screws, connection at the pile driving site does not require time,
Transport to the site can be done efficiently without taking up space.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various changes can be made without departing from the spirit of the invention. For example, in the above embodiment, a case where the present invention is applied to a steel pipe pile is shown, but various steel piles such as a shaped steel pile may be used. Further, the core portion is not limited to a tube portion, and may have various forms irrespective of whether it is a steel pipe pile or a shaped steel pile. Regardless of whether the wing is an expanded bottom wing, a digging wing, or the like, or a spiral wing, various wings may be employed.
Further, in the above-described embodiment, a cross-shaped cross section is employed as the form of the reinforcing rib 9, but it may have various forms.

[0039]

According to the present invention as described above, a steel pile having wings and tip blades can be easily and cost-effectively manufactured. It can be manufactured on a steel pile with a rational structure without any.

[Brief description of the drawings]

1A and 1B show a pile component according to a first embodiment, wherein FIG. 1A is a side sectional view, FIG. 1B is a side view, and FIG. FIG.

FIGS. 2A and 2B show a pile component according to a second embodiment, in which FIG. 1A is a side sectional view, FIG. 2B is a side view, and FIG. FIG.

3 (a) is a side sectional view, FIG. 3 (b) is a side view, and FIG. 3 (c) is a sectional arrow taken along line III-III of FIG. 3 (a). FIG.

4 (a) is a side sectional view, FIG. 4 (b) is a side view, and FIG. 4 (c) is a sectional view taken along line IV-IV in FIG. 4 (a). FIG.

FIGS. 5A and 5B show a pile component according to a fifth embodiment, wherein FIG. 5A is a side sectional view and FIG. 5B is a side view of a pile manufactured using this component.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Steel pipe pile (steel pile) 2 ... Pile main body steel pipe (pile main body) 3 ... Pile tip part (parts) 4 ... Tip blade 5 ... Wing 6 ... Screw part 8 ... Pipe part (core part) 9 ... Reinforcement rib 11 ... Outer end 12 ... Inner end 13 ... Thickening part 14 ... Mating part 16 ... Pile middle part (part)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shigera Hirata 6-6-2 Sakyo, Nara City, Nara Prefecture Inside Daiwa Institute of Technology, Ltd. No. Fuji Corporation F term (reference) 2D041 AA02 BA31 CA05 CB06 DB02 DB14 FA14

Claims (6)

[Claims] 1. A steel part for a steel pile, wherein a core connected to the steel pile main body and a tip blade and / or a wing are integrally provided by molding by casting. 2. The steel part for a steel pile according to claim 1, wherein the blade has a thickness on an outer peripheral end side smaller than a thickness on an inner peripheral end side. 3. The steel part for a steel pile according to claim 1, wherein the core portion comprises a tube portion, and the tube portion is thickened by the casting in a boundary region with the wing. 4. The steel for a steel pile according to claim 1, wherein the core portion comprises a tube portion, and a reinforcing rib is provided integrally with the tube portion by molding in the tube portion. Parts. 5. The steel part for a steel pile according to claim 1, wherein a screw part for screwing connection with the pile body is integrally formed with the core part by casting. 6. The steel part for a steel pile according to claim 1, wherein a fitting part for welding connection with the pile body is integrally formed on the core part by casting.