WO2019111883A1 - Procédé d'arpentage de terrain et cône à pales - Google Patents

Procédé d'arpentage de terrain et cône à pales Download PDF

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Publication number
WO2019111883A1
WO2019111883A1 PCT/JP2018/044533 JP2018044533W WO2019111883A1 WO 2019111883 A1 WO2019111883 A1 WO 2019111883A1 JP 2018044533 W JP2018044533 W JP 2018044533W WO 2019111883 A1 WO2019111883 A1 WO 2019111883A1
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Prior art keywords
cone
penetration
acting
blade
bladed
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PCT/JP2018/044533
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English (en)
Japanese (ja)
Inventor
英一郎 佐伯
孝次 時松
秋男 阿部
Original Assignee
株式会社東京ソイルリサーチ
英一郎 佐伯
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.)
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Application filed by 株式会社東京ソイルリサーチ, 英一郎 佐伯 filed Critical 株式会社東京ソイルリサーチ
Priority to JP2019514321A priority Critical patent/JP6532637B1/ja
Priority to CN201880069368.XA priority patent/CN111263839B/zh
Publication of WO2019111883A1 publication Critical patent/WO2019111883A1/fr

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D1/00—Investigation of foundation soil in situ
    • E02D1/02—Investigation of foundation soil in situ before construction work
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/40—Investigating hardness or rebound hardness

Definitions

  • the present invention belongs to the technical field of a ground survey method using torque required for rotational penetration and a bladed cone suitable for implementation of the ground survey method.
  • Patent Document 1 relating to Patent No. 379 8281: “When rotating a rod having a cutting blade at its tip into a ground, the rotational load and the depth of the tip of the rod are continuously measured.
  • the standard penetration test (A) is time-consuming and costly because it requires replacing the tip device to perform the standard penetration test, in addition to the cost and time for boring. Although this is a dynamic penetration test, a large construction machine is not required, but the N value can be obtained only for every 1 m as the number of falling of the hammer, not a continuous value. There is also a problem that the dynamic penetration resistance has large variations.
  • the cone penetration test of (B) requires a dynamic clear value because it is a penetration test using only static vertical load, but a large pushing force is required and it is impossible to investigate a deep and hard ground. Deep ground investigation is also difficult because of the large friction on the surface of the rod.
  • the Swedish sounding (C) uses vertical force and load torque on the cone and is suitable for soft ground investigations, but it does not have a large impetus and can not investigate deep hard ground. In addition, penetration resistance can be obtained only every 0.25 m as the number of rotations, etc., and it is not a continuous value.
  • the rotary sounding of (D) uses a load vertical force and a load torque, but is a “cutting in” by applying the load vertical force and has no propulsive force. Moreover, since the shape of the tip is not simple, there is no means for evaluating the cone penetration resistance, the N value, etc. from the load vertical force and torque. Moreover, the cost is high and not widespread.
  • the object of the present invention is that by using a bladed cone, it is possible to penetrate into a solid and deep ground even with a small load vertical force by a large blade driving force due to a blade reaction force generated in the ground (ground to be surveyed) by a small load torque.
  • An object of the present invention is to provide a low-cost ground survey method and a bladed cone capable of continuously determining the penetration resistance of the ground with high accuracy and speed by a lightweight and small construction machine.
  • the next object of the present invention is that the action torque and the action vertical force acting on the bladed cone based on the action torque and the action vertical force acting on the bladed cone or per rotation of the bladed cone It is an object of the present invention to provide a ground investigation method and a bladed cone which make it possible to easily evaluate the cone penetration resistance and the N value based on the penetration amount of
  • the ground survey method according to the invention described in claim 1 is provided with a cone portion 2 which is reduced in diameter in the penetration direction, and an outer peripheral surface 2 a of the cone portion 2 and a tip 4 And a rod 7 for attaching the bladed cone 1 to the lower end 5, and the load torque and load vertical force applied to the upper portion 6 of the rod 7
  • the bladed cone 1 is made to penetrate into the ground 9 to be surveyed, and the acting torque and the acting vertical force acting on the bladed cone 1 based on the acting torque and the acting vertical force acting on the bladed cone 1
  • the penetration resistance of the ground 9 to be surveyed is evaluated based on the penetration amount per one rotation of the bladed cone 1.
  • the invention described in claim 2 is the ground survey method according to claim 1, When evaluating the penetration resistance of the survey target ground 9 based on the acting torque acting on the bladed cone 1 and the acting vertical force: It is characterized in that the cone penetration resistance and the standard penetration test N value (hereinafter abbreviated as N value) are evaluated by the following formula.
  • the invention described in claim 3 is the ground survey method according to claim 1,
  • the acting vertical force, and the penetration amount per one rotation of the winged cone 1 When the vertical penetration amount (s) per one rotation of the bladed cone is equal to or smaller than the blade pitch (P), The cone penetration resistance and the N value are evaluated by the following equation from the acting torque, the acting vertical force, and the penetration amount per one rotation of the bladed cone.
  • the bladed cone 1 according to the invention described in claim 5 is the above-mentioned bladed cone used in the ground survey method according to any one of claims 1 to 4, and a cone portion which reduces in diameter toward the tip 4 2 and a spiral blade 3 provided on the outer peripheral surface 2a of the cone 2 and having a narrower width toward the tip 4.
  • the invention described in claim 6 is characterized in that, in the bladed cone 1 described in claim 5, the blade pitch of the bladed cone is 0.5 to 1.5 times the outermost diameter of the cone. .
  • the ground investigation method according to the present invention uses a bladed cone provided with a spiral blade whose width is narrowed toward the tip to the tip cone whose outer diameter decreases toward the tip, penetration resistance of the tip portion is small. Therefore, the bladed cone can be penetrated into the ground with a small load torque and load vertical force. In addition, since this shape has good penetration and penetrates more than the blade pitch per rotation, the balance between the force acting on the bladed cone and the resistance becomes clear, and the ground resistance (strength) with high accuracy can be calculated by the evaluation formula described later. It is possible to predict. In addition, since there is a large blade driving force at the tip, penetration into a deep and hard ground can be made vertically without tilting.
  • the ground survey method according to claim 2, 3 or 4 can accurately convert the acting torque and the acting vertical force into the cone penetration resistance value and the N value used in practice.
  • this investigation method can obtain continuous data on penetration resistance, not discrete data of 1 m per N value.
  • the bladed cone according to claim 6 has an optimum shape that achieves the minimum torque when the blade pitch is 0.5 to 1.5 times (especially 0.5 to 1.0 times) the outermost diameter of the cone. Ru.
  • the right figure is a graph of q c -depth relationship determined from the ground survey, and the left figure is a graph of q c -depth relationship determined by a conventional cone penetration test.
  • the right figure is a graph of the N value-depth relationship determined from the ground survey, and the left figure is a graph of the N value-depth relationship determined by the conventional standard penetration test. It is the graph which showed the relationship between the action torque of a bladed cone, and a blade pitch rate.
  • the bladed cone according to this embodiment shown in FIG. 4 is a ground survey carried out by inserting the bladed cone 1 into the ground 9 by applying a load torque and a load vertical force to the upper portion 6 of the rod 7 (see FIG. 1). Used in the method. Vaned cone in this embodiment the maximum cone diameter D o is 40 mm, the maximum blade diameter D w is 60 mm, total length at 208 mm, and the cone portion 2 whose diameter decreases toward the penetration direction of the distal end 4, the cone portion 2
  • the outer peripheral surface 2 a is configured to include a spiral blade portion 3 formed in a blade shape in which the width narrows toward the tip 4 and spirals. The optimal shape of the spiral blade 3 will be described later. In addition, it should be noted that each of the dimensions is just an example.
  • the bladed cone 1 is attached to the lower end 5 of the rod 7 as illustrated in FIG. 1, and the upper end 6 of the rod 7 operates (the driving device of) the construction machine 8 to load torque and load vertical force. It is rotationally penetrated to the ground 9 by adding. The penetration resistance of the ground 9 can be evaluated based on the value of the load torque and the load vertical force at that time.
  • the “action torque” and the “action vertical force” act on the bladed cone 1.
  • the loading torque and the applied vertical force are the acting torque and the acting vertical force.
  • the action torque and the action vertical force are obtained by subtracting the influence of the surface friction of the rod 7 from the load torque and the load vertical force.
  • the force and torque generated in the bladed cone 1 by the action torque and the action vertical force are the four values of “vertical penetration resistance force”, “penetration friction resistance torque”, “vane propulsion force”, and “vane friction resistance torque”. is there.
  • the loading method includes a displacement control method in which the penetration amount s is controlled to be equal to the blade pitch P and a load control method in which the loading vertical force is controlled to be constant.
  • the load control method there are the following two cases of penetration amount per one rotation.
  • (1) In the case of s ⁇ P (when there is a blade propelling force) When the vertical penetration resistance is larger than the acting vertical force in a hard ground or the like, blade propelling force is generated, and in general, the amount of penetration per one rotation is equal to the blade pitch. When the ground strength rapidly increases (hardens rapidly), the amount of penetration per one rotation may be smaller than the blade pitch.
  • s> P when the blade propelling force is zero
  • the vertical penetration resistance is smaller than the acting vertical force in a soft ground or the like, the blade propelling force becomes zero, and the amount of penetration per one rotation becomes larger than the blade pitch.
  • Vertical penetration resistance force “piercing frictional resistance torque”, “vane propulsion force”, “vane frictional resistance torque” acting on the bladed cone at the time of rotational penetration, and the balance of the forces will be described in detail.
  • Vertical penetration resistance Vertical penetration resistance
  • Vertical penetration resistance R p of the bladed cone shown in FIG. 3 is an index having the same characteristics as the cone penetration resistance q c, it is considered an indicator of the high correlation rigidity and strength and earth removal volume of soil. Therefore, attention is paid to “the total volume V w of the blade and the shaft portion of the largest diameter portion of the bladed cone for discharging per one rotation when the bladed cone is penetrating at a penetration amount s per rotation.
  • V w can be expressed by the following two equations depending on the difference in penetration amount.
  • a cone similar to the tip cone and having a base radius r e is considered as an “equivalent cone”, and the balance of forces of the “equivalent cone” is considered.
  • Normal stress acting on the conical peripheral surface in extreme equilibrium in the ground (the surface pressure) was assumed to be uniformly distributed, the normal stress level per unit area and p p.
  • the circle on which the resultant force F ⁇ p of the frictional force acts to convert it into torque is called the equivalent action circle, and the radius thereof is called the equivalent action radius.
  • the equivalent action radius and the equivalent inclination angle of the circumferentially acting force such as the frictional force by the blade driving force can be determined as follows.
  • blade outer and inner diameters of the blade rotation angle is [psi helical blade when there n Zhou, the maximum outer radius to the maximum radius of r w blade cone shaft and r o, the polar coordinates (r- ⁇ ) It can be expressed as follows.
  • r w ' is a constant value regardless of n
  • the equivalent action radius r w1 ' 2 (r w 3- r o ) of the donut-shaped ring shown in the following (Supplementary) 3 ) / (3 (r w 2- r o 2 )) 3/4 of the value.
  • FIG. 5 is a diagram showing the balance of forces in the vertical (Z-axis) direction and the horizontal ( ⁇ axis) direction when the rod axis is in the horizontal (x) direction and the rod friction is ignored. The explanation of the symbols is given below.
  • H t is a value T b / r w 'obtained by replacing the acting torque T b acting on the bladed cone with a horizontal force on the "equivalent acting circle”.
  • L b is the acting vertical force acting on the bladed cone.
  • PA w Sum of projected area of the blade with a bladed blade
  • F w is a sum of circumferential component forces of the blade friction stress degree generated by the blade driving force with the blade friction resistance ⁇ P w acting on “the equivalent action circle of blade friction resistance torque”.
  • R p is the vertical penetration resistance.
  • ⁇ is the ratio of the equivalent action radius (r e ′) of penetration friction resistance torque to the equivalent action radius (r w ′) of blade friction resistance torque.
  • R p (T b C 2 / r w '+ L b C 1 ) / (C 1 + C 2 ⁇ / C 3 ) (5-5)
  • the vertical penetration resistance force (R p ) of the bladed cone can be expressed by a loading torque (T b ) and a loading vertical force (L b ).
  • the vertical penetration resistance R p of the winged cone can also be expressed from the balance of energy and is shown below.
  • E i L b s + 2 ⁇ T b (6-1)
  • E c E s + E ⁇ E s : energy consumed per revolution by vertical penetration
  • E ⁇ energy consumed per rotation friction
  • the energy E ⁇ consumed by rotation friction can be expressed by the following equation.
  • E ⁇ E ⁇ p + E ⁇ a
  • E ⁇ p Energy consumed per rotation due to penetration friction with rotation
  • E ⁇ a Energy consumed per rotation due to blade friction with rotation (7-1.
  • Energy E s consumed by vertical penetration) E s can be expressed by the following equation.
  • E s R p s (7-1) (7-2.
  • Energy E ⁇ p consumed per rotation due to penetration friction with rotation) E ⁇ p can be expressed by the following equation.
  • E ⁇ a (R p -L b ) / C 2
  • P w (R p -L b ) / C 2
  • R p ⁇ q c A e (9-1) ⁇ : coefficient determined from the relationship between q c and R p , q c : cone penetration resistance A e : equivalent penetration cross section of bladed cone There is the following relationship between N value and cone penetration resistance.
  • the vertical penetration amount (s) per one rotation is the blade pitch (P) according to the equations (9-1), (9-2) and (8-1) based on the "balance of energy” described in claim 3.
  • Cone penetration resistance (q c ) (2 ⁇ T b + L b s + 2 ⁇ w w 'L b / (C 2 cos ⁇ )) / (s + 2 ⁇ ⁇ re ′ / C 3 + 2 ⁇ r w ′ / (C 2 cos ⁇ )) / ( ⁇ A e )
  • N value (2 ⁇ T b + L b s + 2 ⁇ r w 'L b / C 2 cos ⁇ ) / (s + 2 ⁇ r e' / C 3 + 2 ⁇ r w '/ (C 2 cos ⁇ )) / ( ⁇ A e)
  • C 2 cos ⁇ - ⁇ sin ⁇
  • C 3 sin ⁇ + ⁇ cos ⁇ According to (Equation 9), (9-2) and
  • Cone penetration resistance (q c ) (2 ⁇ T b + L b s) / (s + 2 ⁇ r e '/ C 3 ) / ( ⁇ A e )
  • ⁇ 1.
  • R p of the cone penetration resistance and bladed cone is approximately the same value.
  • the cone penetration test was interrupted at two points at a depth of about 17m and interrupted, but this survey method could investigate up to a depth of about 25m without problems.
  • the "N value" according to the present invention can be obtained as continuous data as shown.
  • the blade pitch ratio is 0.5 to 1.5, the acting torque is small. Therefore, when the blade pitch of the bladed cone is 0.5 to 1.5 of the maximum diameter of the cone, it is efficient with a small acting torque. It turns out that it can penetrate.

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  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
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  • Pathology (AREA)
  • Soil Sciences (AREA)
  • Biochemistry (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Abstract

L'invention concerne un procédé d'arpentage de terrain à faible coût et un cône à pales, au moyen desquels il est possible de déterminer en continu la résistance à la pénétration du sol rapidement et avec une précision élevée à l'aide d'une machine de construction légère et de petite taille, afin de pouvoir pénétrer dans le sol dur et profond même avec une faible force verticale de charge à l'aide d'une force de propulsion de pale élevée due à la force de réaction de pale générée dans le sol par un faible couple de charge. La présente invention comprend : un cône à pales (1) ayant une partie de cône (2) dont le diamètre diminue dans la direction de pénétration, et une partie de pale en spirale (3) disposée sur la surface périphérique externe (2a) de la partie de cône (2), la largeur de la partie de pale en spirale (3) diminuant vers une extrémité de pointe (4) ; et une tige (7) fixée à une extrémité inférieure (5) du cône à pales (1) ; le cône à pales (1) étant amené à pénétrer dans le sol (9) à arpenter à l'aide d'un couple de charge et d'une force verticale de charge appliquée à une partie supérieure (6) de la tige (7), et la résistance à la pénétration du sol (9) à arpenter étant évaluée sur la base du couple d'action et de la force verticale d'action agissant sur le cône à pales (1), ou sur la base du couple d'action et de la force verticale d'action agissant sur le cône à pales (1) et du degré de pénétration par rotation du cône à pales (1).
PCT/JP2018/044533 2017-12-06 2018-12-04 Procédé d'arpentage de terrain et cône à pales WO2019111883A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2019514321A JP6532637B1 (ja) 2017-12-06 2018-12-04 地盤調査方法と羽根付きコーン
CN201880069368.XA CN111263839B (zh) 2017-12-06 2018-12-04 土地勘测方法和带有叶片的圆锥体

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JP2017-234080 2017-12-06
JP2017234080 2017-12-06

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3798281B2 (ja) * 2000-12-27 2006-07-19 新日本製鐵株式会社 地盤調査方法
JP2007192626A (ja) * 2006-01-18 2007-08-02 Japan Health Science Foundation 貫入型パイプひずみ計
JP2007239444A (ja) * 2006-02-08 2007-09-20 Yoshito Maeda 地盤情報を得る調査方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2519290Y (zh) * 2001-05-23 2002-10-30 梁军 自压式静力触探仪的贯入装置
CN102644269A (zh) * 2012-05-04 2012-08-22 朱建新 非取土复合桩及其施工方法
JP6159089B2 (ja) * 2013-01-11 2017-07-05 日東精工株式会社 土質判定方法
CN104005415B (zh) * 2014-02-18 2015-12-02 中铁十六局集团北京轨道交通工程建设有限公司 微风化花岗岩中地下连续墙的高效成槽施工方法
CN105510163B (zh) * 2016-01-24 2018-03-27 吉林大学 一种土壤贯入阻力测量装置
CN106223331B (zh) * 2016-09-06 2018-06-12 王继忠 一种钻进喷射振捣搅拌的施工设备及地基基础的施工方法
CN106483018B (zh) * 2016-11-08 2019-07-12 中国水利水电科学研究院 考虑原位结构效应确定深厚覆盖层土体的动强度参数的方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3798281B2 (ja) * 2000-12-27 2006-07-19 新日本製鐵株式会社 地盤調査方法
JP2007192626A (ja) * 2006-01-18 2007-08-02 Japan Health Science Foundation 貫入型パイプひずみ計
JP2007239444A (ja) * 2006-02-08 2007-09-20 Yoshito Maeda 地盤情報を得る調査方法

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CN111263839B (zh) 2021-07-23
CN111263839A (zh) 2020-06-09
JP6532637B1 (ja) 2019-06-19

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