JP2008291523A - Steel pipe pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steel pipe pile having the performance being equal to that of a conventional steel pipe pile with spiral blade and capable of reducing its manufacturing cost. <P>SOLUTION: This steel pipe pile is constituted by attaching a pair of blade plates 2 having the predetermined shape and made of metallic flat plate to a tip part of a pile main body 1 to hold the pile main body 1 from both sides and attaching both of blade plates 2, 2 in such a way that they are inclined at the predetermined angle for a face crossing the longitudinal direction of the pile main body 1 orthogonally and are positioned in parallel with each other at the predetermined interval in the longitudinal direction of the pile main body 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a steel pipe pile mainly used as a foundation pile of a house structure. More specifically, a blade is attached to the tip of the pile body and driven into the ground while rotating the pile body with the blade. Relates to steel pipe piles used in

  Conventionally, publicly known documents such as patent gazettes cannot be specifically cited as this type of steel pipe pile, but a conventionally used steel pipe pile is shown in FIG. This steel pipe pile is formed by welding a spiral blade 22 formed by processing a steel plate into a spiral shape at the tip of the pile body 1. The outer diameter of the spiral blade 22 is 2 to 3 times the diameter of the pile body 1.

  Thus, according to the construction method of penetrating the steel pipe pile into the ground while rotating the pile body 1 provided with the blades 22 at the tip, no impact is generated when the steel pipe pile is penetrated into the ground. A vibration-free construction and an earth-free construction can be realized, and a large vertical support force can be obtained by the effect of compacting the tip ground and the bottom expansion effect of the blades by the rotary press-fitting method. Further, since the passive resistance force acting as a propulsive force on the blade portion at the time of penetration becomes the pullout resistance force as it is, a large pulling support force can be obtained.

  By the way, in the conventional steel pipe pile as described above, a spiral blade is formed by processing a steel plate into a spiral shape, and this is attached to the tip of the pile body. Due to the shape, there was a problem that the production cost of the blades was high and the steel pipe piles were expensive.

  In view of the above problems, an object of the present invention is to provide a steel pipe pile that can be manufactured at a low cost while having performance equivalent to that of a conventional steel pipe pile with spiral blades.

  Means for solving the above problems will be described with reference numerals in the embodiments described later. The steel pipe pile of the invention according to claim 1 comprises a metal flat plate of a required shape at the tip of the pile body 1. A pair of blades 2 and 2 are attached so as to hold the pile main body 1 from both sides, and both the blade plates 2 and 2 are inclined at a required angle θ with respect to a plane perpendicular to the longitudinal direction of the pile main body 1 and piles The main body 1 is attached so as to be displaced in the longitudinal direction by a required distance and to be parallel to each other.

  According to a second aspect of the present invention, in the steel pipe pile according to the first aspect, each vane plate 2 is formed in a substantially semicircular shape by a steel plate and engages with an outer peripheral surface portion of the pile body 1 on a substantially semicircular chord side. An engaging recess 4 is formed.

  According to a third aspect of the present invention, in the steel pipe pile according to the first aspect, each vane plate 2 is formed in a rectangular shape by a steel plate, and an engagement concave portion 4 that engages with the outer peripheral surface portion of the pile body 1 is provided on one side thereof. It is formed.

  According to a fourth aspect of the present invention, in the steel pipe pile according to any one of the first to third aspects, a cutting edge 3 or 13 is attached to the tip of the pile body 1 separately from the blade plate 2. To do.

  Claim 5 is the steel pipe pile according to any one of claims 1 to 4, wherein the pile body 1 includes a plurality of cylindrical members 13 to 15 having different diameters so that the upper stage side has a larger diameter and the lower stage side has a smaller diameter. It is characterized by being formed by coaxially connecting to a plurality of stages.

  A sixth aspect of the present invention is the steel pipe pile according to any one of the first to fourth aspects, wherein a pair of blades 2, 2, 12, 12 is provided at the tip of the pile body 1 and at a portion spaced slightly upward from the pile body 1. And the upper slats 12, 12 are larger in diameter than the slats 2, 2 on the tip side.

  A seventh aspect of the present invention is the steel pipe pile according to the fifth aspect, wherein a pair of blades 2, 2, 12 is provided at a lower end portion of the lowermost cylindrical member 15 and a lower end portion of the cylindrical member 14 one step above. 12 are attached, and the blades 12 and 12 of the upper cylindrical member are larger in diameter than the blades 2 and 2 of the lower cylindrical member 15.

  The effect of the invention by the above-described solution means will be described with reference numerals of embodiments described later. The steel pipe piles 1A, 11A, 21A of the invention according to claim 1 are formed from a metal flat plate at the tip of the pile body 1. A pair of slats 2 and 2 are attached so as to hold the pile body 1 from both sides, and are inclined at a required angle θ with respect to a plane perpendicular to the longitudinal direction of the pile body and shifted by a required distance in the longitudinal direction of the pile body and parallel to each other. The pair of blades 2 and 2 have the same function as the spiral blade 12 attached to the tip of the pile body 1 of the conventional steel pipe pile B. Since it is easier to manufacture than the spiral blade 12, the manufacturing cost of the blade plate 2 is low, and an inexpensive steel pipe pile can be provided.

  According to the invention which concerns on Claim 2, while each blade | wing plate 2 is formed in a substantially semicircle shape with a steel plate, the engagement recessed part 4 engaged with the outer peripheral surface part of the pile main body 1 is provided in the substantially semicircular chord side. Since it is a formed circular blade, it is easy to drive and penetrate the steel pipe piles 1A, 11A, and 21A into the ground.

  According to the invention which concerns on Claim 3, while each blade | wing plate 2 is formed in a rectangular shape with a steel plate, the rectangular shape by which the engagement recessed part 4 engaged with the outer peripheral surface part of the pile main body 1 is formed in the one side. Since it is a shaped blade, it is easier to manufacture and has a greater ground supporting force than a circular blade.

  According to the invention which concerns on Claim 4, by attaching the cutting blades 3 and 13 to the front-end | tip part of the pile main body 1 separately from the slat 2, the steel pipe piles 1A, 11A and 21A are driven and penetrated into the ground. Becomes easy.

  As in the invention according to claim 5, according to the pile main body 1 formed by connecting a plurality of cylindrical members 13 to 15 having different diameters coaxially and integrally to a plurality of stages, a kind of wedge effect is produced in the ground. To provide greater ground support than the straight pile body.

  As in the invention according to claim 6, a pair of blades 2, 2, 12, and 12 are attached to the tip of the pile body 1 and a portion spaced slightly upward from this, respectively, and the upper blade 12 , 12 is a steel pipe pile having a diameter larger than the blades 2 and 2 on the front end side. Since the diameter of the blade plate 2 on the front end side of the pile is smaller than the blade plate 12 on the upper side, Penetration is facilitated, and even greater ground support force is obtained by the tip support force by the blade plate 2 on the pile tip side and the large support force by the large blade plate 12 above the pile.

  As in the invention according to claim 7, a pair of blades 2, 2, 12, and 12 are respectively attached to the lower end portion of the lowermost cylindrical member 15 and the lower end portion of the cylindrical member 14 that is one step above. In the case of a steel pipe pile having a larger diameter than the blades 2 and 2 of the lowermost cylindrical member 15, the blades 12 and 12 of the first upper cylindrical member are a kind of wedge by a plurality of cylindrical members 13 to 15 having different diameters. In addition to exhibiting the effect and obtaining a large ground supporting force, the leading edge supporting force by the blade plate 2 of the lowermost cylindrical member 15 and the large supporting force by the blade plate 12 of the upper cylindrical member 14 are: Greater ground support capacity can be obtained.

  A preferred embodiment of the present invention will be described below with reference to the drawings. Fig. 1 (a) is a perspective view of a steel pipe pile 1A according to the present invention, and (b) is a perspective view of a steel pipe pile 11A according to the present invention. 2 (a) is an enlarged front view of the lower end portion of the steel pipe pile 1A shown in FIG. 1 (a), and FIG. 2 (b) is a sectional view taken along line XX of FIG. (A) is an enlarged front view showing the lower end side of the steel pipe pile 11A shown in (b) of FIG. 1, and (b) is a cross-sectional view taken along the line YY of (a).

  First, in the steel pipe pile 1A shown in FIG. 1 (a), a pair of blades 2 and 2 made of a substantially semicircular steel plate hold the pile body 1 from both sides at the tip of the pile body 1. As shown in FIG. 2 (a), these blades 2 and 2 are inclined at a required angle θ with respect to a virtual orthogonal plane N orthogonal to the longitudinal direction of the pile body 1 and They are attached so as to be parallel to each other while being shifted by a required interval in the longitudinal direction. Further, as shown in FIGS. 2 (a) and 2 (b), a cutting edge 3 made of a small square piece is attached to the tip of the pile body 1 at a position opposed to the diameter direction separately from the blade plate 2. It has been.

  As shown in FIG. 4, each vane plate 2 is formed in a substantially semicircular shape by a steel plate, and an arcuate engagement concave portion 4 that engages with the outer peripheral surface portion of the pile body 1 is provided on the semicircular chord side. It is formed, and the engaging recess 4 is engaged with the outer peripheral surface portion of the pile body 1 and is welded.

  As can be seen from FIG. 2 (b), each semicircular blade 2 is formed slightly larger than a half when one disc is divided into two, and the outer periphery of the pile body 1 The arcuate engagement recess 4 that engages with the surface portion is formed so that its inner peripheral length is slightly longer than ½ of the outer peripheral length of the pile body 1, and therefore, the upper semicircular blade The end portion of the plate 2 and the end portion of the lower semicircular blade plate 2 overlap (wrap) in the vertical direction. In this case, the diameter Dw of the circle of the semicircular blade 2 is about 3 times the diameter D of the pile body 1, for example. As described above, the end portion of the upper semicircular blade plate 2 and the end portion of the lower semicircular blade plate 2 wrap in the vertical direction, so that the ground supporting force is improved. In this embodiment, each semicircular blade 2 is formed in a slightly larger shape than a half when a single disk is divided into two. However, each semicircular blade 2 is a circular plate. It is good also as the same shape as the half-divided body when dividing.

  In order to attach the blade 2 to the tip of the pile body 1 in manufacturing the steel pipe pile 1A, a pair of blades 2 and 2 are attached to the tip of the pile body 1 as shown in FIG. As shown in FIG. 2 (a), the pile body 1 is brought close to both sides so that the engagement recesses 4 and 4 on the inner peripheral side are engaged with the pile body 1 and the blades 2 and 2 are shown. Next, it is inclined, for example, by 10 ° (inclination angle θ) with respect to a virtual orthogonal plane N orthogonal to the longitudinal direction of the pile body 1 and a required distance in the longitudinal direction of the pile body 1, for example, 1/2 of the diameter of the pile body 1 What is necessary is just to weld the engagement recessed parts 4 and 4 of both the blade blades 2 and 2 with respect to the outer peripheral surface of the pile main body 1 in the state which shifted | deviated by the part corresponded to 1/3, and was located in parallel.

  Moreover, 11 A of steel pipe piles shown to (b) of FIG. 1 are attached to the front-end | tip part of the pile main body 1 so that a pair of blades 2 and 2 which consist of a rectangular steel plate hold the pile main body 1 from both sides. In addition, both the blade plates 2 and 2 are inclined at a required angle with respect to a virtual orthogonal plane N orthogonal to the longitudinal direction of the pile main body 1 and a required distance in the longitudinal direction of the pile main body 1 as shown in FIG. They are attached so as to be shifted in parallel with each other. Further, a cutting blade 3 made of a small square piece is attached to the tip of the pile body 1 at a position facing the diameter direction.

  Each blade 2 is formed in a rectangular shape by a steel plate as shown in FIG. 5, and an arcuate engagement recess 4 that engages with the outer peripheral surface of the pile body 1 is formed on one side of the rectangle. Thus, the engaging recess 4 is engaged with the outer peripheral surface portion of the pile body 1 and is welded.

  As can be seen from FIG. 3 (b), each rectangular blade 2 is formed in the same shape as a half when one rectangular plate is divided into two. The arcuate engagement recess 4 that engages with the outer peripheral surface portion is formed so that the inner peripheral length thereof is approximately ½ of the outer peripheral length of the pile body 1. The diameter Dw of the circle of each rectangular blade 2 is about 2.5 times the diameter D of the pile body 1, for example.

  In manufacturing this steel pipe pile 11A, in order to attach the blade 2 to the tip of the pile body 1, a pair of blades 2, 2 are attached to the tip of the pile body 1, as shown in FIG. While approaching the pile main body 1 from both sides, the engaging recesses 4 and 4 are engaged with the pile main body 1, and both the blade plates 2 and 2 are connected to the pile main body as shown in FIG. Inclined by, for example, 10 ° with respect to the virtual orthogonal plane N orthogonal to the longitudinal direction of 1 and shifted in the longitudinal direction of the pile body 1 by an amount corresponding to 1/2 to 1/3 of the diameter of the pile body 1, for example. The engagement recesses 4, 4 of both blade plates 2, 2 may be welded to the outer peripheral surface of the pile body 1 in a state where the blades 2, 2 are positioned.

  FIG. 6 shows a steel pipe pile 1 </ b> A or 11 </ b> A in which a cutting edge 13 having a substantially isosceles triangle shape is attached to the distal end portion of the pile body 1. In FIGS. 1A and 1B, reference numeral 5 denotes a pair of rotational drive transmission fittings on both sides projecting from both sides in the diameter direction of the upper end (pile head) of the pile body 1.

  In order to drive the steel pipe piles 1A and 11A configured as described above into the ground, the steel pipe piles 1A and 11A are suspended and set in an auger machine using a crawler crane or the like. At this time, the pair of rotation drive transmission metal fittings 5 and 5 provided on both ends of the pile body 1 protruding from the upper end are engaged with engaged portions of a rotating shaft portion of an auger machine (not shown). Next, the tip of the steel pipe piles 1A and 11A is fixed to a predetermined position by a steadying means, and the verticality of the steel pipe piles 1A and 11A is confirmed, and then the ground is applied to the steel pipe piles 1A and 11A with rotation by an auger machine. Rotate into the inside. The steel pipe piles 1A and 11A are added as appropriate, and if the lower steel pipe piles 1A and 11A are rotated and penetrated to a predetermined depth, the rotary press fitting is stopped and the construction is finished.

  The steel pipe piles 1A and 11A described above are attached to the tip of the pile body 1 so that a pair of blade plates 2 made of a metal flat plate of a required shape are attached to both sides of the pile body 1 from both sides. , 2 are attached so as to incline at a required angle θ with respect to a plane orthogonal to the longitudinal direction of the pile body 1 and to be positioned parallel to each other at a necessary interval in the longitudinal direction of the pile body 1. The pair of blades 2 and 2 have the same function as the spiral blade 12 attached to the tip of the pile body 1 of the conventional steel pipe pile B shown in FIG. That is, a large vertical ground supporting force due to the area of the blade plate 2 can be obtained by the bottom expansion effect of the pair of blade plates 2 and 2, and no impact is generated when the steel pipe pile penetrates into the ground. Noise / vibration-free construction and soil-free construction can be realized, and the passive resistance that acts as a driving force on the blades 2 and 2 when the pile body 1 penetrates becomes the resistance to pulling out. can get.

  As described above, the steel pipe piles 1A and 11A have the same function as the spiral blade 12 attached to the tip of the pile body 1 of the conventional steel pipe pile B, but are easier to manufacture than the spiral blade 12. The production cost of the slats 2 is low, and an inexpensive steel pipe pile can be provided. That is, since the blade plate 2 is a two-dimensional shape made of a metal flat plate, it is easier to manufacture the blade than the three-dimensional blade plate 12 in the conventional steel pipe pile B, and the manufacturing cost of the steel pipe piles 1A and 11A Can be cheaper.

  In order to manufacture the semicircular blade 2 in the case of the steel pipe pile 1A, for example, a rectangular steel plate material is cut into a semicircle to form the outer shape of the blade 2, and the semicircle Since it is only necessary to form the engaging recess 4 in the string portion by cutting, it can be easily and easily manufactured. Further, in order to manufacture the rectangular blade plate 2 in the case of the steel pipe pile 11A, the steel plate material may be cut into a rectangular shape having a predetermined size, and the engaging recess 4 may be formed on the predetermined side by cutting. Therefore, it can be manufactured easily and easily. Moreover, in the case of the rectangular blade 2, compared to the case of the semicircular blade 2, there are fewer parts to be cut and discarded, and the steel plate material can be used effectively, so that the manufacturing cost can be further reduced.

  Moreover, in the case of the steel pipe pile 1A provided with the circular blades 2 and 2, the pile main body 1 can be easily driven and penetrated into the ground. In addition, in the case of the steel pipe pile 11A provided with the rectangular blade plates 2 and 2, it becomes easier to manufacture each blade plate 2 and the ground supporting force is larger than the steel pipe pile 11A provided with the circular blade plate. Become.

  FIG. 7 shows the above-mentioned steel pipe at the tip of a pile body 1 formed by connecting a plurality of steel pipe cylindrical members having different diameters coaxially and integrally to a plurality of stages so that the upper stage side has a larger diameter and the lower stage side has a smaller diameter. The steel pipe pile 21A which attached a pair of blades 2 and 2 similar to the piles 1A and 11A is shown.

  The steel pipe pile 21A is formed in a three-stage cylindrical shape including an upper-stage side cylindrical member 13, an intermediate-stage side cylindrical member 14, and a lower-stage side cylindrical member 15 whose outer diameters are sequentially reduced. The middle-stage cylindrical member 14 is connected by welding via a steel plate ring member 17 that forms a step portion 16 between the two cylindrical members 13, 14, and the middle-stage cylindrical member 14 and the lower-stage cylindrical member 15 are A pair of blades similar to the steel pipe piles 1A and 11A are connected to each other by welding via a steel plate ring member 19 that forms a step portion 18 between the cylindrical members 14 and 15. Plates 2 and 2 are attached. In FIG. 7, the pile body 1 is formed in a three-stage shape including an upper stage side, a middle stage side, and a lower stage side. However, the pile body 1 is also formed in a two-stage form including an upper stage side and a lower stage side. It is good and it is good also as four steps or more.

  According to such a steel pipe pile 21A, according to what the pile main body 1 is formed by connecting a plurality of cylindrical members 13 to 15 having different diameters coaxially and integrally in a plurality of stages, it is a kind of wedge effect in the ground. To provide greater ground support than the straight pile body.

  FIG. 8 shows a steel pipe pile 31A in which a pair of blades 2, 2, 12, and 12 are respectively attached to the tip (lower end) of the straight pile body 1 and a portion spaced slightly upward from this. The upper blades 12 and 12 are larger in diameter than the distal blades 2 and 2. About the structure of the blades 2 and 12, it is the same as that of the blade 2 of the steel pipe piles 1A and 11A demonstrated by FIGS.

  Like this steel pipe pile 31A, when a pair of blades 2, 2, 12, and 12 are attached to the tip of the pile body 1 and a part slightly spaced above this, the blade 2 on the pile tip side Since the diameter of the blade is smaller than the blade plate 12 on the upper side, the penetration into the ground is facilitated, and the tip supporting force by the blade plate 2 on the tip side of the pile and the large blade plate above this A greater ground support force can be obtained by the greater support force of 12.

  FIG. 9 shows a pair of cylindrical members 13 to 15 having different diameters as shown in FIG. 7, each having a pair of a lower end portion of the lowermost cylindrical member 15 and a lower end portion of the cylindrical member 14 that is one step above. The steel pipe pile 41A to which the slats 2, 2, 12, 12 are shown is shown. The slats 12, 12 of the upper cylindrical member are larger in diameter than the slats 2, 2 of the lowermost cylindrical member 15. It has become. About the structure of cylindrical members 13-15, it is the same as that of 21 A of steel pipe piles shown in FIG.

  According to such a steel pipe pile 41A, in addition to exhibiting a kind of wedge effect by a plurality of cylindrical members 13 to 15 having different diameters to obtain a large ground supporting force, the blade plate 2 of the lowermost cylinder member 15 is provided. Even greater ground support force can be obtained by the tip support force due to and the large support force due to the vane plate 12 of the cylindrical member 14 on the upper stage.

(a) is a perspective view of the steel pipe pile by one Embodiment of this invention, (b) is a perspective view of the steel pipe pile by other embodiment of this invention. (a) is an enlarged front view on the lower end side of the steel pipe pile shown in (a) of FIG. 1, and (b) is a sectional view taken along line XX of (a). (a) is the enlarged front view which shows the lower end part side of the steel pipe pile shown to (b) of FIG. 1, (b) is the YY sectional view taken on the line of (a). It is a top view which shows the state before attaching the two semicircle shaped blades of the steel pipe pile shown to (a) of FIG. 1 to a pile main body. It is a top view which shows the state before attaching the two rectangular blades of the steel pipe pile shown to (b) of FIG. 1 to a pile main body. (a) is a principal part front view which shows other embodiment of the steel pipe pile of this invention, (b) is the ZZ sectional view taken on the line of (a). It is a front view of the steel pipe pile by other embodiment of this invention. It is a front view of the steel pipe pile by other embodiment of this invention. It is a front view of the steel pipe pile by other embodiment of this invention. (a) is a front view of a conventional steel pipe pile, and (b) is a cross-sectional view taken along line VV of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1A Steel pipe pile 1 of this invention Pile main body 2 Blade | blade 4 Engagement recessed part 11A Steel pipe pile 12 of this invention 21 Blade plate 21A Steel pipe pile 31A of this invention Steel pipe pile 41A Steel pipe pile B of this invention Steel pipe pile B Conventional steel pipe pile

Claims (7)

  A pair of blades made of a flat metal plate of the required shape is attached to the tip of the pile body so as to hold the pile body from both sides, and both blades are required for the plane perpendicular to the longitudinal direction of the pile body A steel pipe pile which is attached so as to be inclined in angle and to be parallel to each other with a required distance shifted in the longitudinal direction of the pile body.   2. The steel pipe pile according to claim 1, wherein each blade is formed in a substantially semicircular shape by a steel plate, and an engagement concave portion that engages with an outer peripheral surface portion of the pile main body is formed on a substantially semicircular chord side.   2. The steel pipe pile according to claim 1, wherein each blade is formed in a rectangular shape by a steel plate, and an engagement concave portion that engages with an outer peripheral surface portion of the pile body is formed on one side thereof.   The steel pipe pile according to any one of claims 1 to 3, wherein a cutting blade is attached to the tip of the pile body separately from the blades.   The pile body according to any one of claims 1 to 4, wherein the pile body is formed by coaxially connecting a plurality of cylindrical members having different diameters so as to have a large diameter on the upper stage side and a small diameter on the lower stage side. Steel pipe pile.   A pair of slats is attached to the tip of the pile body and a portion spaced slightly above, respectively, and the slats on the upper side are larger in diameter than the slats on the tip side. The steel pipe pile according to any one of the above.   A pair of blades is attached to the lower end of the lowermost cylindrical member and the lower end of the upper cylindrical member, and the blades of the upper cylindrical member are more than the blades of the lowermost cylindrical member. The steel pipe pile according to claim 5, which has a large diameter.

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