WO2011155619A1 - Groupe de pieux de fondation - Google Patents

Groupe de pieux de fondation Download PDF

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Publication number
WO2011155619A1
WO2011155619A1 PCT/JP2011/063424 JP2011063424W WO2011155619A1 WO 2011155619 A1 WO2011155619 A1 WO 2011155619A1 JP 2011063424 W JP2011063424 W JP 2011063424W WO 2011155619 A1 WO2011155619 A1 WO 2011155619A1
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WO
WIPO (PCT)
Prior art keywords
pile
foundation
steel pipe
construction
group
Prior art date
Application number
PCT/JP2011/063424
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English (en)
Japanese (ja)
Inventor
正宏 林
Original Assignee
Ｊｆｅスチール株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ｊｆｅスチール株式会社 filed Critical Ｊｆｅスチール株式会社
Publication of WO2011155619A1 publication Critical patent/WO2011155619A1/fr

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00—Foundations as substructures
    • E02D27/10—Deep foundations
    • E02D27/12—Pile foundations

Definitions

  • the present invention relates to a foundation pile group, and more particularly to a foundation pile group including a plurality of foundation piles that support a predetermined structure.
  • a plurality of foundation piles that support a predetermined structure may have different required support forces depending on the positions at which they are arranged. For example, in the foundation pile that supports the lower floor and the foundation pile that supports the higher floor, the support force required for the latter is greater. Therefore, the foundation pile which can change a tip support force according to the total support force requested
  • Patent Document 1 The invention disclosed in Patent Document 1 is to form a drilling hole in the ground using a drilling rod equipped with a blade expanding blade whose diameter is freely expandable at the tip, and the blade expanding blade at a predetermined depth. Rotate and rotate to form a bulb part of the same size as the diameter of the expanded blade expansion blade, and further inject cement milk into the bulb part to form an enlarged rooted bulb and drill holes Concrete piles will be laid on the ground. Therefore, when the total supporting force requested
  • the invention disclosed in Patent Document 2 is one in which a helical wing is fixed on the outer peripheral surface of the tip of the pile body (hereinafter referred to as “rotary penetration steel pipe pile” or “screw pile”).
  • the outer diameter of the spiral blade is preferably about 1.5 to 3.0 times that of the pile body.
  • This invention solves the said problem, Comprising: It aims at providing the foundation pile group comprised from the foundation pile which is easy to construct and can support the requested
  • a foundation pile group according to the present invention is formed from a plurality of foundation piles supporting a predetermined structure, Each of the plurality of foundation piles includes a pile body, and a substantially spiral wing fixedly provided at or near the tip of the pile body, The outer diameters of the blades are substantially the same.
  • it is a foundation pile group formed from a plurality of foundation piles supporting a predetermined structure, Each of the plurality of foundation piles includes a pile body, and an enlarged root bulb formed at the tip of the pile body, The outer diameters of the enlarged rooted bulbs are substantially the same.
  • each of these several foundation piles one or both of the outer diameter of each said pile main body or wall thickness is determined, It is characterized by the above-mentioned.
  • the strength of the material forming each of the pile main bodies is determined according to the total supporting force required for each of the plurality of foundation piles.
  • the pile body is a steel pipe or concrete.
  • FIG. 1 is a side view schematically showing the entire foundation pile group according to Embodiment 1 of the present invention.
  • FIG. 2 is a side view schematically showing another example of the steel pipe pile forming the foundation pile group shown.
  • FIG. 3 is a side view schematically showing the entire foundation pile group according to Embodiment 2 of the present invention.
  • FIG. 1 is a side view schematically showing the whole, and FIG. 2 is a part of other (steel pipe piles). It is a side view which shows an example typically.
  • the foundation pile group 10 is composed of a plurality of foundation piles 1 a, 1 b, 1 c, 1 d, installed on the ground 90, and supporting a structure 80.
  • Each of the foundation piles 1a, 1b, 1c, and 1d is a steel pipe (same as the pile body) 2a, 2b, 2c, and 2d, and a substantially spiral shape fixed to the tip of the steel pipes 2a, 2b, 2c, and 2d or in the vicinity of the tip.
  • Helical blades 3a, 3b, 3c, 3d are provided.
  • the outer diameters of the spiral blades 3a, 3b, 3c, and 3d are formed to be substantially the same.
  • symbol suffix "a, b, c, d" may be abbreviate
  • the foundation pile group 10 which consists of the four foundation piles 1 is shown for convenience of explanation, the present invention does not limit the number of foundation piles.
  • the outer diameters of the spiral blades 3a, 3b, 3c, 3d (all are substantially Is the outer diameter capable of supporting the largest tip support force Qa.
  • the plate thickness of the spiral blade can be increased or decreased according to the magnitude of the tip support force to make it a reasonable specification (for example, for a tip support force of 1000 kN, the plate thickness is set to 40 mm and 500 kN For the tip support force, the plate thickness is 20 mm).
  • the steel pipes 2a, 2b, 2c, and 2d may have a material, an outer diameter, and a wall thickness (the steel pipe 2 and the spiral blade 3 are substantially the same) that can support the largest tip support force Qa.
  • the tip support force may have a material, an outer diameter, and a wall thickness that can support each of Qa, Qb, Qc, and Qd (the steel blade 2 is different, but the spiral blade 3 is substantially the same).
  • ⁇ a and ⁇ d, Da and Dd, ta and td are the allowable stress (design stress), outer diameter, and thickness of the steel pipe 2a and steel pipe 2d, respectively.
  • the present invention does not limit the form of the spiral blade 3.
  • it has one or more spiral surfaces of one or more rolls installed on the side surface of the steel pipe 2 and one or more spiral surfaces of less than one roll installed evenly in the circumferential direction. Also good.
  • it is a substantially semicircular disk installed in a pair of letter-shaped notch part formed in the front-end
  • blade diameter the outer diameter of the spiral blade
  • the blade diameter is one magnification (1.5 to 3).
  • the blade diameter is different for each outer diameter of the pile body.
  • the torque is almost determined by the resistance of the spiral blade.
  • a construction machine corresponding to the torque generated at the largest blade diameter is required.
  • the force (torque) cannot be controlled, and it may penetrate into the support layer deeper than a predetermined depth.
  • the bearing capacity performance of a screwed pile the bearing capacity (referred to as “tip bearing capacity” in the present invention) shared by the helical wing (tip-bottomed pile) occupies most of the total bearing capacity.
  • the supporting force to be shared referred to as “peripheral surface supporting force” or “peripheral surface frictional force” in the present invention) is relatively small. For this reason, even if the outer diameter of the steel pipe is changed, the total supporting force hardly changes. Therefore, in the present invention, the total support force and the tip support force are substantially the same.
  • the conventional pile foundation is a screwed pile (steel pipe pile), STK400, SKK400 (tensile strength is 400 N / mm 2 ), STK490, SKK490 (tensile strength is 490 N / mm).
  • mm 2 and other materials are used to ensure a predetermined cross-sectional area (minimum cross-sectional area in which the axial stress generated in the steel pipe when the required tip support force (vertical load) is applied is kept within a predetermined degree of stress)
  • the design was such that the plate thickness was changed without changing the pile diameter. Therefore, the case where the outer diameter of the steel pipe is reduced will be examined below.
  • the material of the steel pipe 2 is changed. That is, by using a high-strength steel pipe, the tip support force can be supported even if the cross-sectional area (particularly the outer diameter) is reduced.
  • a steel pipe having an outer diameter of 800 mm, a wall thickness of 12 mm, and a yield strength of 325 N / mm 2 (corresponding to a conventional SKK490 material) has a yield strength of 485 N / mm 2 (yield strength is about 1.5 times).
  • the outer diameter can be 600 mm and the wall thickness can be 11 mm for the same axial force. If it does so, the torque of the surrounding surface in the case of construction will be restrained small, and a construction machine can be reduced in size.
  • the strength of the steel pipe is preferably about 500 to 1000 N / mm 2 in terms of tensile strength and about 325 to 700 N / mm 2 in terms of yield strength. If the strength is too high, the manufacturing cost of the steel pipe becomes high and the weldability at the site deteriorates, so that the total cost of construction is not necessarily reduced.
  • the foundation pile 30 is another example of the foundation pile 1, and includes an upper pile 31, an intermediate pile 32, a lower pile 33, and a spiral blade 34 fixed to the lower pile 33.
  • the spiral wings 34 are a pair of substantially semicircular disks installed in a substantially L-shaped cutout formed at the tip of the lower pile 33, and are inclined in different directions in a side view, and the lower pile 33 When viewed from the axial direction, although they are actually a pair of substantially semi-discs separated from each other, they are visually recognized as substantially discs.
  • the upper pile 31 and the middle pile 32 can be made into a high strength steel pipe pile, and the lower pile 33 can be made into a normal strength steel pipe (conventional steel pipe), and thickness can also be enlarged so that buckling may not arise.
  • the upper pile 31 can be a normal strength steel pipe (conventional steel pipe)
  • the middle pile 32 and the lower pile 33 can be a high strength steel pipe material.
  • the lower pile 33 and the middle pile 32 may be “PHC pile” or the like.
  • FIG. 3 is a side view schematically showing the entire foundation pile group according to the second embodiment of the present invention.
  • the foundation pile group 20 includes a plurality of foundation piles 4 a, 4 b, 4 c, and 4 d and is installed on the ground 90 to support the structure 80.
  • the foundation piles 4a, 4b, 4c, and 4d are pile bodies 5a, 5b, 5c, and 5d, and root-solidifying bulbs 6a, 6b, 6c, and 6d formed at the tip ends of the pile bodies 5a, 5b, 5c, and 5d, respectively. It has.
  • the outer diameters of the root-fixing bulbs 6a, 6b, 6c, and 6d are formed to be substantially the same.
  • the foundation pile group 20 which consists of the four foundation piles 4 is shown for convenience of explanation, the present invention does not limit the number of foundation piles.
  • the present invention does not limit the shape of the root bulb 6, the shape of the excavation bit, the diameter expansion mechanism, and the like.
  • the construction method is not limited, and any method such as Nakabori method or pre-boring method may be used.
  • the expansion bit When reaching the position where the rooted bulb 6 is to be created, the expansion bit is opened with a mechanical or hydraulic method, cement milk with a high blend is injected, the support layer ground is excavated and stirred, and the rooted bulb 6 is formed. To do.
  • the bit In the mechanical type, the bit is expanded by rotating in the direction opposite to that during excavation. That is, it projects outward in the radial direction.
  • the diameter of the bit In the hydraulic type, the diameter of the bit is increased by hydraulic pressure. At this time, it is better to use means for transmitting the fact that the bit has expanded to the ground by radio, cable, vibration, or the like and confirming that the rooted bulb 6 has been reliably created.
  • the mechanical type rotates in the forward direction to fold the bit, and in the hydraulic type, the bit is reduced in diameter by hydraulic pressure and pulled up to the ground. Finally, the pile body 5 is solidified and installed in the bulb 6, and the process is completed.
  • Pre-boring method In the pre-boring method, a bit capable of excavating the peripheral surface portion of the pile body 5 is prepared according to the outer diameter of the pile body 5. You may excavate with the same diameter according to the maximum pile diameter. However, the smaller the diameter of the pile, the smaller the excavation diameter will improve the construction speed, and the amount of cement milk injected and the amount of excavated soil will decrease. Therefore, the construction cost can be expected to be reduced.
  • the formation of the root-clamping bulb 6 is the same as that of the borehole method, and a bit that expands or contracts by a mechanical method or a hydraulic method is prepared. After forming the root bulb 6, the bit is pulled up. When the bit is pulled up, it may be pulled up while injecting cement milk. After collecting the bit, the pile body 5 is built in the soil cement, and is laid down to a predetermined depth, and the process is completed.
  • the outer diameters of the consolidation bulbs 6 of the pile bodies 5 are substantially the same. Accordingly, since there are few types of outer diameters of the tip root bulbs 6 at the construction site, it is not necessary to prepare a large number of excavation bits. Since the outer diameter of the root hardening bulb 6 is fixed, it is possible to excavate with one construction machine, and the construction cost is reduced. In addition, since the outer diameter of the root-fixing bulb 6 is the same, there is no construction error that makes a mistake in the outer diameter of the root-solidifying bulb 6 of the foundation pile 4 to be installed at a specific construction position (standing position). It is also possible to reduce the risk in construction.
  • the pile body 5 is not limited to a steel pipe, and may be a ready-made pile such as an “SC pile” or a “PHC pile”.
  • the allowable stress and outer diameter (outer diameter and thickness in the case of a hollow body) of the material forming the pile main body 5 are substantially the same as or different from each other according to the first embodiment. It is determined according to the required tip support force. Since the pile main body 5 and the root-clamping bulb 6 integrally exhibit the tip support force, it is desirable to provide protrusions on the inner surface and outer surface of the pile main body 5 to increase the adhesion force.
  • the outer diameter can be made smaller than that of a conventional normal-strength steel pipe. it can. If the outer diameter becomes smaller, handling of the pile becomes easier.
  • the pile body is made of high-strength steel pipe, the consolidation ratio will be larger than that of the conventional normal-strength steel pipe, but the drilling amount of the peripheral surface portion of the pile body 5 will decrease as the pile diameter becomes smaller. As a result, the amount of cement to be injected and the amount of discharged soil are reduced, and the construction cost can be reduced.
  • a large protrusion or the like is provided in order to enhance the adhesion between the steel pipe and the root hardening bulb 6.
  • the construction since the construction is easy and the required total supporting force can be surely supported, it can be widely used as a foundation pile group for supporting various structures.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Piles And Underground Anchors (AREA)
  • Foundations (AREA)

Abstract

L'invention concerne un groupe de pieux de fondation formé à partir de pieux de fondation pouvant soutenir de manière fiable la capacité portante totale requise, et qui est facile à construire. Le groupe (10) de pieux de fondation, qui est formé d'une pluralité de pieux de fondation (1a, 1b, 1c, 1d), est installé dans le sol (90) et maintient une structure (80). Les pieux de fondation (1a, 1b, 1c, 1d) sont équipés chacun d'un tuyau d'acier (identique à celui des corps de pieu) (2a, 2b, 2c, 2d) et d'une palette hélicoïdale (3a, 3b, 3c, 3d), qui est presque hélicoïdale et est fixée à l'extrémité ou à proximité de l'extrémité du tuyau d'acier (2a, 2b, 2c, 2d). De plus, les diamètres extérieurs des palettes hélicoïdales (3a, 3b, 3c, 3d) sont formés de manière à être quasiment égaux.
PCT/JP2011/063424 2010-06-07 2011-06-06 Groupe de pieux de fondation WO2011155619A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010-129794 2010-06-07
JP2010129794 2010-06-07

Publications (1)

Publication Number Publication Date
WO2011155619A1 true WO2011155619A1 (fr) 2011-12-15

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PCT/JP2011/063424 WO2011155619A1 (fr) 2010-06-07 2011-06-06 Groupe de pieux de fondation

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JP (1) JP5817226B2 (fr)
TW (1) TW201204901A (fr)
WO (1) WO2011155619A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103669386A (zh) * 2013-12-30 2014-03-26 中铁二十四局集团有限公司 利用u字型排桩基础提高桩群承载力的方法
CN115897646A (zh) * 2022-11-18 2023-04-04 国网四川省电力公司达州供电公司 群桩杆塔基础设计方法、微型桩杆塔基础及其施工方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6263864B2 (ja) * 2013-05-24 2018-01-24 新日鐵住金株式会社 防潮堤
JP7165347B2 (ja) * 2018-09-14 2022-11-04 株式会社大林組 トンネル工事の先受鋼管による掘削工法
JP6958527B2 (ja) * 2018-10-01 2021-11-02 Ｊｆｅスチール株式会社 地すべり抑止用杭およびその設計方法
JP6958528B2 (ja) * 2018-10-01 2021-11-02 Ｊｆｅスチール株式会社 地すべり抑止用杭およびその設計方法

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JP2007113270A (ja) * 2005-10-20 2007-05-10 Nippon Steel Corp 基礎構造および基礎構造の施工方法

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JPH0649840A (ja) * 1991-07-05 1994-02-22 Nippon Steel Corp 液状化抑止鋼管基礎杭の施工法
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JP3904274B2 (ja) * 1997-02-25 2007-04-11 日本コンクリート工業株式会社 建造物の基礎の施工方法
JP5024692B2 (ja) * 1999-12-27 2012-09-12 三谷セキサン株式会社 基礎杭の構築方法、既製杭、杭穴掘削ロッド
JP4837849B2 (ja) * 2001-08-22 2011-12-14 株式会社テノックス ソイルセメント合成杭の造成方法
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JP2007113270A (ja) * 2005-10-20 2007-05-10 Nippon Steel Corp 基礎構造および基礎構造の施工方法

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KOKAN KUI -SONO SEKKEI TO SEKO, REVISED 12TH EDITION, JAPANESE TECHNICAL ASSOCIATION FOR STEEL PIPE PILES AND SHEET PILES, 1 April 2009 (2009-04-01), pages 92 - 93 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103669386A (zh) * 2013-12-30 2014-03-26 中铁二十四局集团有限公司 利用u字型排桩基础提高桩群承载力的方法
CN103669386B (zh) * 2013-12-30 2016-08-17 中铁二十四局集团有限公司 利用u字型排桩基础提高桩群承载力的方法
CN115897646A (zh) * 2022-11-18 2023-04-04 国网四川省电力公司达州供电公司 群桩杆塔基础设计方法、微型桩杆塔基础及其施工方法

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JP2012017648A (ja) 2012-01-26
TW201204901A (en) 2012-02-01

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