CN111032961A - Hat-shaped steel sheet pile - Google Patents
Hat-shaped steel sheet pile Download PDFInfo
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- CN111032961A CN111032961A CN201880052395.6A CN201880052395A CN111032961A CN 111032961 A CN111032961 A CN 111032961A CN 201880052395 A CN201880052395 A CN 201880052395A CN 111032961 A CN111032961 A CN 111032961A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
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Abstract
A hat-shaped steel sheet pile (1) having a plurality of wall bodies arranged to extend in the longitudinal direction, and having a cross-sectional area A (cm) per 1m in the width direction of the hat-shaped steel sheet pile (1)2M) and a moment of inertia I (cm) around a center line M of the cross section extending in the width direction in a plan view seen from the longitudinal direction of the hat-shaped steel sheet pile (1)4and/M) satisfies formula (1), and satisfies formula (2A) and formula (2B), or satisfies formula (3A) and formula (3B), or satisfies formula (4A) and formula (4B), or satisfies formula (5A) and formula (5B), when a distance between a 1 st intersection point (P1) of extension lines of the pair of flange portions (11) and the cross-sectional gravity line M in the plan view is D1(mm), and a distance between a 2 nd intersection point P2 of the pair of flange portions (11) and the cross-sectional gravity line M is D2 (mm). A < 0.00252I +94.4 … (1); 262.6＜D1＜281.0…(2A)；496.9＜D1＜520.9…(3A)；621.5＜D1＜650.9…(4A)；625.2＜D1＜654.8…(5A)；484.0＜D2＜499.0…(2B)；474.0＜D2＜489.0…(3B)；476.0＜D2＜491.0…(4B)；474.0＜D2＜489.0…(5B)。
Description
Technical Field
The invention relates to a hat-shaped steel sheet pile.
The present application claims priority based on Japanese application No. 2017-193111, 10/month 2 in 2017, the contents of which are incorporated herein by reference.
Background
Conventionally, a hat-shaped steel sheet pile is known, in which a wall body is formed by a plurality of hat-shaped steel sheet piles, and the hat-shaped steel sheet pile extends in a longitudinal direction.
The hat-shaped steel sheet pile is provided with: a web portion; a pair of flange portions extending obliquely with respect to the web portion; and a pair of arm portions connected to the pair of flange portions, respectively.
The hat-shaped steel sheet pile is constructed by connecting a plurality of hat-shaped steel sheet piles in the width direction, for example, in a land-side area, and constitutes a wall body that supports an external force from the cross-sectional height direction orthogonal to the width direction in a plan view viewed from the longitudinal direction. As a method for constructing the hat-shaped steel sheet pile, for example, a driving method using a vibrator by a locking method or a clamping method as shown in patent document 1 and patent document 2 is known, and this method is generally called a vibro hammer (vibramometer) method. In the vibration hammer method, a hat-shaped steel sheet pile is driven to the ground with a pair of flange portions of the hat-shaped steel sheet pile gripped by grip portions of heavy construction equipment.
As another working method, a press-in working method is known. In the press-fitting method, the hat-shaped steel sheet pile is driven to the ground while the pair of arms of the hat-shaped steel sheet pile are held between the holding portions of the construction heavy equipment, while the entire hat-shaped steel sheet pile is surrounded from the outside thereof.
Documents of the prior art
Patent document
Patent document 1: japanese patent No. 3916621
Patent document 2: japanese patent No. 4656587
Disclosure of Invention
Problems to be solved by the invention
In the locking method (gripping method) described in patent document 1, the angle of the gripping portion of the construction heavy equipment is rotated in accordance with the angle formed by the pair of flange portions, and substantially corresponds to the two flange angles. When the grip portion is to be adjusted to a larger angle, the number of fixing holes provided in the grip portion increases, the strength of the end portion of the grip portion becomes insufficient, and the size of the adjustment jig for adjusting the position of the grip portion increases. This deteriorates workability and increases the manufacturing cost of the device. Therefore, it is difficult to apply the grip portion to the pair of flange portions at various angles.
In the clamping method (gripping method) described in patent document 2, different positioning members are required in accordance with the angle formed by the pair of flange portions.
On the other hand, in order to be able to adapt to various shapes of steel sheet pile sections, different vibration hammers are used depending on the steel sheet pile section, which leads to deterioration in productivity and increase in cost of the vibration hammers. In the case where a plurality of cross sections having different shapes are mixed and processed in a construction site, for example, the construction time and the construction cost increase due to the replacement of the vibration hammer, and the workability is deteriorated. Therefore, if the same type can be applied to a plurality of steel sheet pile sections as the vibration hammer, the efficiency is high, and the conventional vibration hammer is designed to be applicable to a plurality of steel sheet pile types and to be used in common.
However, in order to efficiently generate driving energy for driving into the soil by transmitting the vibration of the vibration hammer to the hat-shaped steel sheet pile at the tip end portion of the hat-shaped steel sheet pile opposite to the side gripped by the vibration hammer in the longitudinal direction, the mechanical design is performed so that the energy transmission from the driving portion of the vibration hammer to the gripping portion gripping the hat-shaped steel sheet pile is smooth. Further, it is required to reduce the movable range of the grip portion and firmly grip the grip portion so as to absorb construction errors during driving and manufacturing errors of the hat-shaped steel sheet pile cross section itself. Therefore, it is advantageous to provide a new hat-shaped steel sheet pile which is more economical and can be adapted to a conventional vibration hammer of an optimum design without impairing the productivity of the vibration hammer manufacture and the workability at the construction site. In particular, in a hat-shaped steel sheet pile having an effective width of 900mm larger than that of a conventional U-shaped steel sheet pile having a width of 400mm or 600mm, the lateral movement in the cross-sectional direction of the sheet pile caused by the vibration of the vibration hammer is increased, and the driving efficiency is lowered. Therefore, the vibration hammer of the double locking type, which suppresses the lateral vibration by grasping two portions of the flange, is designed to be used in an optimum specification. Accordingly, if a hat-shaped sheet pile cross section that can be applied to the construction heavy equipment is provided, the economy can be improved as it is.
In the press-fitting method, there is also a problem that the applicable cross-sectional shape is limited due to the restriction of the shape of the clamping portion of the construction heavy equipment and the size of the entire hat-shaped steel sheet pile.
The present invention has been made in view of the above problems, and an object thereof is to provide a hat-shaped steel sheet pile that can contribute to cost reduction while ensuring cross-sectional performance, and can ensure versatility of heavy equipment for construction.
Means for solving the problems
In order to solve the above problems and achieve the object, the present invention adopts the following technical means.
(1) In accordance with one aspect of the present invention, there is provided a hat-shaped steel sheet pile, which is provided with a plurality of hat-shaped steel sheet piles arranged to form a wall body, and which extends in a longitudinal direction, the hat-shaped steel sheet pile including: a web portion extending in a width direction in which the wall extends in a plan view viewed from the longitudinal direction; a pair of flange parts connected to the web partThe widthwise outer end portion of (a) extends obliquely with respect to the web portion in the plan view; and a pair of arm portions connected to end portions of the pair of flange portions on a side opposite to the web portion in the width direction, extending in the width direction in the plan view, and having a cross-sectional area a (cm) per 1m in the width direction of the hat-shaped steel sheet pile2M) and a sectional moment of inertia I (cm) around a sectional gravity center line extending in the width direction in the plan view4And/m) satisfies the equation (1), and when a distance between a 1 st intersection point of extension lines of the pair of flange portions and the cross-sectional gravity center line in the plan view is D1(mm), and a distance between a 2 nd intersection point of extension lines of the pair of flange portions and the cross-sectional gravity center line is D2(mm),
satisfies formula (2A) and satisfies formula (2B), or
Satisfies formula (3A) and satisfies formula (3B), or
Satisfies formula (4A) and satisfies formula (4B), or
Satisfies formula (5A) and formula (5B),
A＜0.00252I+94.4…(1)；
262.6＜D1＜281.0…(2A)；
496.9＜D1＜520.9…(3A)；
621.5＜D1＜650.9…(4A)；
625.2＜D1＜654.8…(5A)；
484.0＜D2＜499.0…(2B)；
474.0＜D2＜489.0…(3B)；
476.0＜D2＜491.0…(4B)；
474.0＜D2＜489.0…(5B)。
according to the hat-shaped steel sheet pile of this aspect, the relationship between the cross-sectional area a per 1m in the width direction of the hat-shaped steel sheet pile and the sectional moment of inertia I around the cross-sectional gravity center line extending in the width direction in the plan view viewed from the longitudinal direction satisfies equation (1). Therefore, even when the cross-sectional performance of the existing hat-shaped steel sheet pile is secured or changed, the cross-sectional area can be reduced, which contributes to cost reduction.
The relationship between D1 and D2 satisfies any one of the relationships of formula (2A) and formula (2B), formula (3A) and formula (3B), formula (4A) and formula (4B), and formula (5A) and formula (5B). Therefore, by changing the dimensions in the width direction of the pair of gripping portions of the construction heavy equipment used for construction of each hat-shaped steel sheet pile of various sizes, the construction heavy equipment can be used for the steel sheet pile of the present invention, and the versatility of the construction heavy equipment can be ensured. In the hat-shaped steel sheet pile according to the above aspect, the distance between the 2 nd intersection points may be equal to any one of the distances between the 2 nd intersection points of existing hat-shaped steel sheet piles of various sizes. In addition, the inclination angle between the pair of flange portions of the hat-shaped steel sheet pile according to the above-described aspect may be set to be equal to any one of the inclination angles between the flange portions of the hat-shaped steel sheet piles of various sizes in use.
Accordingly, the hat-shaped steel sheet pile of the present invention can be directly gripped by the grip portion of the construction heavy equipment used in the construction of existing hat-shaped steel sheet piles of various sizes, and the construction work using the conventional construction heavy equipment can be smoothly performed.
(2) In the hat-shaped steel sheet pile according to the above (1), the D1 and the D2 may satisfy the formula (2A) and the formula (2B).
(3) In the hat-shaped steel sheet pile according to the above (1), D1 and D2 may satisfy the above formula (3A) and the above formula (3B).
(4) In the hat-shaped steel sheet pile according to the above (1), the D1 and the D2 may satisfy the formula (4A) and the formula (4B).
(5) In the hat-shaped steel sheet pile according to the above (1), the D1 and the D2 may satisfy the formula (5A) and the formula (5B).
(6) In the hat-shaped steel sheet pile according to item (1), an effective width w (mm) between the outer ends in the width direction of each of the pair of arm portions may satisfy item (6), and a distance h (mm) in a cross-sectional height direction orthogonal to the width direction in the plan view between a surface of the web portion that faces the side opposite to a cross-sectional gravity center line along the width direction and a surface of the arm portion that faces the side opposite to the cross-sectional gravity center line along the width direction may satisfy item (7).
876≤W≤932…(6)
H＜400…(7)
In this case, the effective width W satisfies equation (6), and the distance H satisfies equation (7). Therefore, the above hat-shaped steel sheet pile has an increased possibility of being able to: the construction heavy equipment using the conventional general press-fitting method surrounds the entire hat-shaped steel sheet pile from the outside of the hat-shaped steel sheet pile in the plan view while holding the arm portion by the holding portion of the construction heavy equipment using the press-fitting method. This can further ensure the versatility of the construction heavy equipment.
(7) In the hat-shaped steel sheet pile according to any one of the above (1) to (6), a distance l (mm) between the 3 rd intersection point and the cross-sectional gravity center line, a distance h (mm) in a cross-sectional height direction orthogonal to the width direction in the plan view between a surface of the web portion facing the opposite side to the cross-sectional gravity center line in the width direction and a surface of the arm portion facing the opposite side to the cross-sectional gravity center line in the width direction, and a distance c (mm) between a surface of the web portion facing the opposite side to the cross-sectional gravity center line in the width direction and the cross-sectional gravity center line may satisfy formula (8),
L>H-C…(8)，
the 3 rd intersection point is an intersection point of 2 nd intersection points passing through the pair of flange portions and the center line of gravity of the cross section, and perpendicular lines perpendicular to the pair of flange portions.
In this case, the 3 rd intersection point is located outside the hat-shaped steel sheet pile in the cross-sectional height direction in the plan view. Therefore, when the hat-shaped steel sheet pile is driven and constructed on the ground, the soil located inside the hat-shaped steel sheet pile in the plan view can be discharged toward the outside along the width direction of the hat-shaped steel sheet pile through the space between the pair of arm portions in the width direction. Further, by providing the hat-shaped steel sheet pile with such a soil-discharging effect, workability of the hat-shaped steel sheet pile can be ensured.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the hat-shaped steel sheet pile of the present invention, it is possible to contribute to cost reduction while ensuring the cross-sectional performance, and to ensure the versatility of heavy construction equipment.
Drawings
Fig. 1 is a view showing a hat-shaped steel sheet pile according to an embodiment of the present invention, which mainly corresponds to the type 10H, and is a plan view seen from the longitudinal direction of the hat-shaped steel sheet pile.
Fig. 2 is a graph showing the relationship between the cross-sectional area and the sectional moment of inertia of a hat-shaped steel sheet pile.
Fig. 3 is a view showing a hat-shaped steel sheet pile according to the present embodiment, which mainly corresponds to the pattern 25H, and is a plan view seen from the longitudinal direction of the hat-shaped steel sheet pile.
Fig. 4 is a view showing a hat-shaped steel sheet pile of the present embodiment, which mainly corresponds to pattern 45H, and is a plan view seen from the longitudinal direction of the hat-shaped steel sheet pile.
Fig. 5 is a view showing (a) a grip portion for a vibro-hammer working method and (b) a grip portion for a press-in working method in heavy equipment for construction of hat-shaped steel sheet piles.
Detailed Description
The hat-shaped steel sheet pile 1 according to an embodiment of the present invention will be described below with reference to fig. 1 and 2. As shown in fig. 1, a hat-shaped steel sheet pile 1 extends in the long direction (Z direction). A plurality of hat-shaped steel sheet piles 1 are arranged in the width direction (the direction orthogonal to the Z direction, the X direction described later) to form a wall body. The wall extends in one direction in a plan view viewed from the longitudinal direction. In the following description, the above-mentioned direction is referred to as a width direction (X direction), and a direction perpendicular to the width direction in the plan view is referred to as a cross-sectional height direction (Y direction). Among the variables used for the description, those with overlapping reference numerals may not be described in units.
The hat-shaped steel sheet pile 1 includes: a web portion 10 extending in the width direction; a pair of flange portions 11 connected to outer end portions in the width direction of the web portion 10; and a pair of arm portions 12 connected to end portions of the pair of flange portions 11 on the side opposite to the web portion 10 in the width direction. The flange portion 11 extends obliquely with respect to the web portion 10 in the plan view. The pair of flange portions 11 gradually expands in the width direction as they extend from the web portion 10. The inclination angles of the pair of flange portions 11 with respect to the width direction are equal to each other. The arm portion 12 extends in the width direction in the plan view.
A coupling joint 13 is connected to each outer end portion in the width direction of the pair of arm portions 12. The connection joint 13 has a C-shape in the plan view, and includes a connection port 13A that opens in the cross-sectional height direction. The directions in which the respective coupling ports 13A of the pair of arm portions 12 open are opposite to each other in the plan view. In the hat-shaped steel sheet pile 1, the shape of the portion other than the coupling joint 13 is formed to be line-symmetrical with respect to the center line in the width direction in the plan view.
A plurality of hat-shaped steel sheet piles 1 are arranged in series in the width direction. The hat-shaped steel sheet piles 1 adjacent to each other in the width direction have the same orientation in the cross-sectional height direction. By coupling the coupling joints 13 adjacent to each other so as to fit into each other, a wall body extending in the width direction is formed by the plurality of hat-shaped steel sheet piles 1.
In the hat-shaped steel sheet pile 1 according to the embodiment of the present invention, the cross-sectional area a (cm) is set to 1m in the width direction of the hat-shaped steel sheet pile (i.e., 1m in the width of the hat-shaped steel sheet pile)2M) and a sectional moment of inertia I (cm) around a sectional gravity line M extending in the width direction in the plan view4The relationship of/m) (hereinafter, simply referred to as the sectional moment of inertia) satisfies the formula (1). Here, the sectional gravity center line M extending in the width direction in the plan view means a straight line passing through the center of gravity of the hat-shaped steel sheet pile 1 and extending in the width direction in the plan view.
A＜0.00252I+94.4…(1)
The cross-sectional area a and the moment of inertia I per 1m in the width direction of the hat-shaped steel sheet pile are values obtained by dividing the cross-sectional area and the moment of inertia of the cross-section of each steel sheet pile by the effective width W of the steel sheet pile. In the following description, "the size per 1m in the width direction of the hat-shaped steel sheet pile" is omitted, and is simply referred to as the cross-sectional area or the sectional moment of inertia.
The technical significance of formula (1) is explained below.
The hat-shaped steel sheet pile 1 supports an external force from the cross-sectional height direction, and therefore is required to have high cross-sectional performance such as a cross-sectional moment of inertia, a cross-sectional coefficient, and the like. Therefore, it is required to reduce the cross-sectional area in both the width direction and the cross-sectional height direction while securing or changing the cross-sectional performance of the cross-sectional shape of the existing hat-shaped steel sheet pile, thereby achieving a cross-sectional shape that contributes to cost reduction.
Therefore, the present inventors have tailored the cross-sectional characteristics and major dimensions for each type of hat steel sheet pile currently available. The results are shown in Table 1. The distance C in table 1 is a distance (mm) between the surface of the web portion 10 facing the opposite side of the cross-sectional gravity line M in the width direction and the cross-sectional gravity line M.
TABLE 1
Next, fig. 2 shows a correlation between the sectional moment of inertia I and the sectional area a of the four types of table 1. The right side of equation (1) is derived as a straight line S connecting the values of current patterns 10H and 45H. That is, when the formula (1) is satisfied, the cross-sectional area per unit moment of inertia of the cross section is smaller than that of the existing hat-shaped steel sheet pile, and it can be said that the cross-sectional shape is more economical than that of the existing hat-shaped steel sheet pile.
The cross-sectional area A (cm) may be set as required4The upper limit of the amount of the catalyst is 0.00252I +94.0 or 0.00252I + 93.6. Although the cross-sectional area A (cm) is not particularly limited4/m), but may be 40, and if necessary, may be 0.00252I + 40.
If construction heavy equipment (including accessories for gripping, and the like, hereinafter the same) dedicated to each type corresponding to the hat-shaped steel sheet piles of the conventional types 10H, 25H, 45H, and 50H can be directly used, the economical efficiency is high. From this viewpoint, the constituent elements other than the formula (1) will be described as corresponding to each type of formula.
As will be described later, the hat-shaped steel sheet pile according to an embodiment of the present invention can be classified into four types, i.e., a type 10H counterpart, a type 25H counterpart, a type 45H counterpart, and a type 50H counterpart. All of the four counterparts of the present embodiment satisfy formula (1).
(type 10H counterpart)
With a directional section moment of inertia I of 10,500 (cm)4/m) left and right hat-shaped steel sheet piles, the hat-shaped steel sheet pile 1 of the type 10H is an example, and the structural requirements other than the formula (1) will be described.
The following was found: by setting the hat-shaped steel sheet pile cross section to a suitable combination of both the distance D1(mm) in the cross-sectional height direction and the distance D2(mm) in the width direction, the construction heavy equipment for the hat-shaped steel sheet pile of the conventional type 10H can be directly applied, and the driving energy generated by the vibration hammer can be efficiently transmitted to the hat-shaped steel sheet pile. Here, the distance D1 is a distance between the 1 st intersection point P1 of the extension lines of the pair of flange portions 11 in the plan view and the cross-sectional gravity center line M. The distance D2 is a distance between the 2 nd intersection points P2 of the pair of flange portions 11 with the cross-sectional gravity line M in plan view.
In addition, in the hat-shaped steel sheet pile corresponding to pattern 10H, a distance D1 between the 1 st intersection point P1 of the extension lines of the pair of flange portions 11 in the plan view and the cross-sectional gravity center line M satisfies formula (2A).
262.6＜D1＜281.0…(2A)
The technical significance of formula (2A) is explained below.
If heavy construction equipment corresponding to the hat-shaped steel sheet pile of the existing type 10H can be directly used to drive the hat-shaped steel sheet pile 1 to the ground by the hammer method as shown in fig. 5(a), the economical efficiency is high. Therefore, in order to use the grip 30 for gripping the 2 nd intersection point P2 of the pair of flange portions 11 of the hat-shaped steel sheet pile 1 and the cross-sectional gravity center line M, the distance D1 is required to be substantially equal to that of the existing hat-shaped steel sheet pile. This is because: by making the distance D1 substantially equal, the grip portion 30 of the heavy equipment for constructing a hat-shaped steel sheet pile of the current form 10H can easily grip the pair of flange portions 11 of the hat-shaped steel sheet pile 1.
Here, the distance D1 is expressed by equation (20) using the dimensions of each part of the hat-shaped steel sheet pile 1 shown in fig. 1.
D1＝(B/2)×tanθ+C-tw/2…(20)
Here, B represents a dimension (mm) of the web portion 10 in the width direction, θ represents a flange angle (°), C represents a distance (mm) between a surface of the web portion 10 facing the opposite side of the center line of gravity M of the cross section along the width direction and the center line of gravity M of the cross section, and tw represents a thickness dimension (mm) of the web portion 10.
Next, the distance D1 that enables absorption of construction errors and transmission of appropriate driving energy was examined, and it was found that expressions (21) and (22) were obtained. Here, the distance H is a distance (effective height) between a surface of the web portion 10 facing the opposite side of the cross-sectional gravity line M in the width direction and a surface of the arm portion 12 facing the opposite side of the cross-sectional gravity line M in the width direction.
D1MAX＝(B/2)×tanθ+C-(tw/2)+0.04×H…(21)
D1MIN＝(B/2)×tanθ+C-(tw/2)-0.04×H…(22)
That is, the value of D1 of the hat-shaped steel sheet pile 1 is D1 in the formula (21) related to the size of each part of the existing hat-shaped steel sheet pileMAXTo D1 in formula (22)MINWithin the range of (3), efficient driving can be achieved.
Then, the formula (2A) is obtained from the respective sizes of the hat-shaped steel sheet pile of the existing type 10H, the formula (21), and the formula (22).
In addition, in the hat-shaped steel sheet pile corresponding to pattern 10H, the distance D2 between the 2 nd intersection point P2 with the cross-sectional gravity line M of each of the pair of flange portions 11 satisfies formula (2B).
484.0＜D2＜499.0…(2B)
The technical significance of formula (2B) is explained below.
As described above, when the construction heavy equipment for the hat-shaped steel sheet pile of the existing type 10H is used and the hat-shaped steel sheet pile 1 is pressed by the vibration hammer method, the gripping portion 30 of the construction heavy equipment grips the portion on the cross-sectional gravity center line M of the hat-shaped steel sheet pile 1, thereby enabling the operation in a stable state. Therefore, the distance D2 is required to be approximately equal to the current hat-shaped steel sheet pile. This is because: by making the distance D2 substantially equal, the grip 30 of the heavy construction equipment for hat-shaped steel sheet piles of the current type 10H can directly grip the hat-shaped steel sheet pile 1.
Then, the distance D2 that can achieve the absorption of construction errors and the transmission of appropriate driving energy is selected, and as a result, it is found that the expressions (23) and (24) are in appropriate ranges.
D2MAX＝D2+10…(23)
D2MIN＝D2-5…(24)
That is, the value of D2 of the hat-shaped steel sheet pile 1 is D2 in the following formula (23)MAXTo D2 in formula (24)MINThe range of (3), the efficient driving can be realized.
Here, the effective width W is a distance from the fitting center of the coupling joint 13 on one side in the width direction to the fitting center of the coupling joint 13 on the other side in the width direction.
The fitting state of the coupling joints 13 includes compression fitting, neutral fitting, and tension fitting. That is, the compression fitting in which the mutually adjacent coupling joints 13 are compressed in the width direction, the tension fitting in which the mutually adjacent coupling joints 13 are stretched in the width direction, and the neutral fitting in which the mutually adjacent coupling joints 13 are neither compressed nor stretched are intermediate states between the compression fitting and the tension fitting. The effective width W in the present embodiment corresponds to the distance between the joint centers in the neutral fitting state.
Then, based on the respective sizes of current pattern 10H, formula (23) and formula (24), formula (2B) is obtained.
In addition, in the hat-shaped steel sheet pile corresponding to the pattern 10H, the effective width w (mm) between the outer ends in the width direction of each of the pair of arm portions 12 satisfies the formula (6).
876≤W≤932…(6)
The technical significance of formula (6) is explained below.
For example, if heavy construction equipment for the press-fitting method used for the hat-shaped steel sheet pile of the existing type 10H can be used instead of the hammer method in order to press-fit the hat-shaped steel sheet pile 1 by the press-fitting method as shown in fig. 5(b) without using the hammer method, the economical efficiency is high. Therefore, in order to use the holding portions 40 for holding both ends of the pair of arm portions 12 of the hat-shaped steel sheet pile 1, the effective width W is preferably substantially equal to that of the existing hat-shaped steel sheet pile. This is because: by making the effective widths W substantially equal, the clamping portions 40 of the heavy construction equipment in the existing press-fitting method for hat-shaped steel sheet piles of the type 10H can clamp both ends of the pair of arm portions 12.
Then, the following was confirmed: in heavy construction equipment for a press-fitting method used for a hat-shaped steel sheet pile of the existing type 10H, the distance in the width direction that can be clamped by the clamping portion 40 is 876mm to 932 mm. That is, when the effective width W satisfies formula (6), construction heavy equipment in the existing press-fitting method can be used. Further, it can be confirmed that the distance in the width direction of the pattern 20H, the pattern 45H, and the pattern 50H other than the pattern 10H is 876mm to 932 mm. Therefore, it is also preferable that the corresponding products of these types satisfy formula (6).
In addition, in the hat-shaped steel sheet pile corresponding to the pattern 10H, the distance H (mm) satisfies the formula (7).
H≤400…(7)
The technical significance of formula (7) is explained below.
As described above, in the case of construction heavy equipment in the existing press-fitting method for hat type steel sheet piles of type 10H being used for the hat type steel sheet piles 1, the clamp portion 40 of the construction heavy equipment surrounds the entire hat type steel sheet pile 1 from the outside of the hat type steel sheet pile 1, and therefore the distance H is preferably substantially equal to that of the existing hat type steel sheet piles. This is because: by making the distance H substantially equal, the entire hat-shaped steel sheet pile 1 can be surrounded from the outside of the hat-shaped steel sheet pile 1 by the clamp 40 of the existing heavy construction equipment.
Then, the following was confirmed: in heavy construction equipment using a press-fitting method for a hat-shaped steel sheet pile of the conventional type 10H, the distance in the cross-sectional height direction of the entire hat-shaped steel sheet pile 1 surrounded by the clamp 40 can be 400mm or less. That is, when the distance H satisfies the formula (7), the clamp portion 40 of the existing construction heavy equipment can be used. Further, it was confirmed that the distance in the cross-sectional height direction of the pattern 20H, the pattern 45H, and the pattern 50H other than the pattern 10H was 400mm or less. Therefore, it is also preferable that the corresponding products of these types satisfy formula (6).
In addition, in the hat-shaped steel sheet pile corresponding to the pattern 10H, a distance l (mm) between the 3 rd intersection point P3 and the sectional gravity center line M, the distance H (mm) between the web portion 10 and the arm portion 12, and a distance c (mm) between a surface of the web portion 10 facing the opposite side of the sectional gravity center line M in the width direction and the sectional gravity center line M satisfy the formula (8),
L>H-C…(8)，
the 3 rd intersection point P3 is an intersection point of the 2 nd intersection points P2 of the pair of flange portions 11 with the cross-sectional gravity center line M and perpendicular lines perpendicular to the pair of flange portions 11.
The technical significance of formula (8) is explained below.
When driving the hat-shaped steel sheet pile 1 to the ground by the vibration hammer method or the press-in method, a pair of earth discharge pressures (earth pressures) from the pair of flange portions 11 facing each other in the width direction toward the inner side in the width direction oppose each other. Therefore, the soil surrounded by the web portion 10 and the pair of flange portions 11 is tightened by the earth discharge pressure, and there are cases where the construction load for constructing the hat steel sheet pile 1 increases, and the hat steel sheet pile 1 is deformed by the reaction force from the soil.
Therefore, the 3 rd intersection P3 of the line of action of the earth discharge pressure is located on the outer side in the cross-sectional height direction than the arm portion 12 in the cross-sectional height direction (on the lower side than the arm portion 12 in fig. 1). Thus, when a soil discharge pressure acts on the soil surrounded by the web portion 10 and the pair of flange portions 11, the soil can be pushed out to the outside of the arm portion 12 in the cross-sectional height direction (soil discharge effect). This can suppress an increase in construction load and deformation of the hat-shaped steel sheet pile 1. Further, satisfying equation (8) allows the 3 rd intersection P3 of the line of action of the earth discharge pressure to be located further outward than the arm portion 12 in the cross-sectional height direction.
(type 25H counterpart)
Next, a hat-shaped steel sheet pile 2 according to the present embodiment corresponding to the type 25H will be described with reference to fig. 3. In the hat-shaped steel sheet pile 2 corresponding to the type 25H, the same portions as those of the above-described configuration are denoted by the same reference numerals, and the description thereof is omitted, and only different points will be described.
As shown in fig. 3, the hat-shaped steel sheet pile 2 corresponding to the pattern 25H is larger in size in the cross-sectional height direction than the hat-shaped steel sheet pile 1. Therefore, the distance L, the distance C, and the distance H in the hat-shaped steel sheet pile 2 do not satisfy the aforementioned formula (8).
In addition, in the hat-shaped steel sheet pile 2 corresponding to the pattern 25H, the formula (3A) is satisfied instead of the formula (2A).
496.9＜D1＜520.9…(3A)
In the hat-shaped steel sheet pile 2 corresponding to the pattern 25H, the formula (3A) is obtained from the respective sizes of the hat-shaped steel sheet pile of the current pattern 25H, the formula (21), and the formula (22).
Here, the pattern 25H means that the sectional moment of inertia is 24,400 (cm)4/m) about the hat-shaped steel sheet pile.
In addition, in the hat-shaped steel sheet pile 2 corresponding to the pattern 25H, the formula (3B) is satisfied instead of the formula (2B).
474.0＜D2＜489.0…(3B)
In the hat-shaped steel sheet pile 2 corresponding to the pattern 25H, the formula (3B) is obtained from the respective sizes of the hat-shaped steel sheet pile of the current pattern 25H, the formula (23), and the formula (24).
(type 45H counterpart)
Next, a hat-shaped steel sheet pile 3 according to version 45H of the present embodiment will be described with reference to fig. 4. In the hat-shaped steel sheet pile 3 corresponding to the type 45H, the same portions as those of the above-described configuration are denoted by the same reference numerals, and the description thereof is omitted, and only different points will be described.
As shown in fig. 4, in the hat-shaped steel sheet pile 3 corresponding to the pattern 45H, the size in the cross-sectional height direction is larger than that of the hat-shaped steel sheet pile 2 in particular. Therefore, the distance L, the distance C, and the distance H in the hat-shaped steel sheet pile 3 corresponding to the pattern 45H do not satisfy the aforementioned formula (8).
In addition, in the hat-shaped steel sheet pile 3 corresponding to the type 45H, the formula (4A) is satisfied instead of the formula (2A).
621.5＜D1＜650.9…(4A)
In the hat-shaped steel sheet pile 3 corresponding to the type 45H, the formula (4A) is obtained from the respective sizes of the hat-shaped steel sheet pile of the existing type 45H, the formula (21), and the formula (22).
Here, the pattern 45H means that the cross-sectional moment of inertia is 45,000 (cm)4/m) about the hat-shaped steel sheet pile.
In addition, in the hat-shaped steel sheet pile 3 corresponding to the pattern 45H, the formula (4B) is satisfied instead of the formula (2B).
476.0＜D2＜491.0…(4B)
In the hat-shaped steel sheet pile 3 corresponding to the type 45H, the formula (4B) is obtained from the respective sizes of the hat-shaped steel sheet pile of the existing type 45H, the formula (23), and the formula (24).
(type 50H counterpart)
Next, the hat-shaped steel sheet pile 4 according to the embodiment corresponding to the version 50H will be described. In the hat-shaped steel sheet pile 4 corresponding to the type 50H, the same portions as those of the above-described configuration are denoted by the same reference numerals, and the description thereof is omitted, and only different points will be described. The sectional shape of the hat-shaped steel sheet pile corresponding to the pattern 50H is substantially the same as that of the pattern 45H, and illustration thereof is omitted.
In the hat-shaped steel sheet pile 4 corresponding to the pattern 50H, the formulas (5A) and (5B) are satisfied. The formulae (5A) and (5B) are obtained from the respective dimensions of the formula 50H, the formulae (21), (22), (23), and (24).
Here, the pattern 50H means that the cross-sectional moment of inertia is 51,100 (cm)4Per m) left and right capAnd (5) forming the steel sheet pile.
625.2＜D1＜654.8…(5A)
474.0＜D2＜489.0…(5B)
As described above, if the relation between the cross-sectional area a of 1M in the width direction of the hat-shaped steel sheet pile and the moment of inertia I of the cross-section around the cross-sectional gravity center line M extending in the width direction in the plan view viewed from the longitudinal direction satisfies the expression (1), the cross-sectional area can be reduced while securing or changing the cross-sectional performance of the existing hat-shaped steel sheet pile, which can contribute to cost reduction.
Further, if the relationship between D1 and D2 satisfies any one of the relationships of formula (2A) and formula (2B), formula (3A) and formula (3B), formula (4A) and formula (4B), and formula (5A) and formula (5B), the dimensions in the width direction of the pair of grip portions 30 of the construction heavy equipment used when each hat-shaped steel sheet pile of the existing various dimensions is constructed can be changed, so that the existing construction heavy equipment can be used, and the versatility of the construction heavy equipment can be ensured.
Further, if the effective width W between the outer ends in the width direction of each of the pair of arm portions 12 satisfies formula (6) and the distance H in the cross-sectional height direction orthogonal to the width direction in the plan view between the web portion 10 and the arm portion 12 satisfies formula (7), the possibility that construction can be performed using construction heavy equipment of the current general-purpose press-in work method becomes high. This can further ensure the versatility of the construction heavy equipment.
Further, when the 3 rd intersection point P3 is located outside the hat-shaped steel sheet piles 1 to 4 in the plan view (that is, when the hat-shaped steel sheet pile satisfies expression (8)), soil located inside the hat-shaped steel sheet piles 1 to 4 in the plan view can be discharged to the outside along the width direction of the hat-shaped steel sheet pile through between the pair of arm portions 12 in the width direction when the construction is performed by driving the hat-shaped steel sheet pile to the ground, and the 3 rd intersection point P3 is an intersection point of the perpendicular lines that pass through the 2 nd intersection point P2 of each of the pair of flange portions 11 and the cross-sectional gravity line M and are orthogonal to each of the pair of flange portions 11. Further, by providing the hat-shaped steel sheet pile with such a soil-discharging effect, workability of the hat-shaped steel sheet pile can be ensured.
Examples
Next, examples of the present embodiment will be explained. Experiments were repeated to satisfy the conditions of formula (1), formula (2), and formulae (2A) to (5B), and 20 cases were designed. The design results are shown in table 2. The distance C in table 2 is a distance (mm) between the surface of the web portion 10 facing the opposite side of the cross-sectional center of gravity M in the width direction and the cross-sectional center of gravity M.
TABLE 2
All examples satisfy formula (1). Examples 1 to 6 satisfy the formulae (2A) and (2B). Therefore, the hat-shaped steel sheet piles of examples 1 to 6 can be classified into type 10H counterparts. That is, it is possible to perform construction using heavy construction equipment for hat steel sheet piles of the existing type 10H.
Examples 7 to 12 satisfy the formulae (3A) and (3B). Therefore, the hat-shaped steel sheet piles of examples 7 to 12 can be classified into type 25H counterparts. That is, construction can be performed using heavy construction equipment for hat steel sheet piles of the existing type 25H.
Examples 13 to 18 satisfy all of formula (4A), formula (5A), formula (4B) and formula (5B). Therefore, the hat-shaped steel sheet piles of examples 13 to 18 can be classified into both type 45H counterparts and type 50H counterparts. That is, the hat-shaped steel sheet piles according to examples 13 to 18 can be constructed using construction heavy equipment for hat-shaped steel sheet piles of both existing types 45H and 50H.
Example 19 satisfies formula (4A) and formula (4B). Therefore, the hat-shaped steel sheet pile of example 19 can be classified as a type 45H counterpart. That is, the hat-shaped steel sheet pile of example 19 can be constructed using construction heavy equipment for the hat-shaped steel sheet pile of the existing type 45H.
Example 20 satisfied formula (5A) and formula (5B). Therefore, the hat-shaped steel sheet pile of example 20 can be classified as a type 50H counterpart. That is, the hat-shaped steel sheet pile of example 20 can be constructed using construction heavy equipment for the hat-shaped steel sheet pile of the existing version 50H.
While the embodiments and examples of the present invention have been described in detail with reference to the drawings, the specific configurations are not limited thereto, and modifications, combinations, deletions, and the like of the configurations may be included without departing from the scope of the gist of the present invention. Further, the respective configurations described in the embodiments may be combined as appropriate.
For example, in the above embodiment, the configuration is shown in which the effective width w (mm) between the outer ends in the width direction of each of the pair of arm portions 12 satisfies formula (6), and the distance h (mm) in the cross-sectional height direction between the web portion 10 and the arm portion 12 satisfies formula (7), but the present invention is not limited to such a configuration. The effective width W may not satisfy formula (6), and the distance H may not satisfy formula (7).
Industrial applicability
According to the present invention, it is possible to contribute to cost reduction while ensuring the cross-sectional performance, and to ensure the versatility of construction heavy equipment. Thus, the present invention has a large industrial applicability.
Description of the reference symbols
1. 2, 3, 4 hat-shaped steel sheet pile
10 web part
11 flange part
12 arm part
Center of gravity of M section
Claims (7)
1. A hat-shaped steel sheet pile, which is provided with a plurality of hat-shaped steel sheet piles to form a wall body, and which extends in a longitudinal direction, the hat-shaped steel sheet pile comprising:
a web portion extending in a width direction in which the wall extends in a plan view viewed from the longitudinal direction;
a pair of flange portions connected to outer end portions of the web portion in the width direction and extending obliquely with respect to the web portion in the plan view; and
a pair of arm portions connected to end portions of the pair of flange portions on a side opposite to the web portion in the width direction, respectively, and extending in the width direction in the plan view,
a cross-sectional area Acm in the width direction of the hat-shaped steel sheet pile per 1m2M, and moment of area inertia Icm around a center line of gravity of a cross section extending in the width direction in the plan view4The relationship of/m satisfies the formula (1),
and, when a distance between a 1 st intersection point of extension lines of the pair of flange portions and the cross-sectional gravity center line in the plan view is D1mm, and a distance between a 2 nd intersection point of the pair of flange portions and the cross-sectional gravity center line is D2mm,
satisfies formula (2A) and satisfies formula (2B), or
Satisfies formula (3A) and satisfies formula (3B), or
Satisfies formula (4A) and satisfies formula (4B), or
Satisfies formula (5A) and formula (5B),
A＜0.00252I+94.4…(1)；
262.6＜D1＜281.0…(2A)；
496.9＜D1＜520.9…(3A)；
621.5＜D1＜650.9…(4A)；
625.2＜D1＜654.8…(5A)；
484.0＜D2＜499.0…(2B)；
474.0＜D2＜489.0…(3B)；
476.0＜D2＜491.0…(4B)；
474.0＜D2＜489.0…(5B)。
2. the hat-shaped steel sheet pile according to claim 1,
the D1 and the D2 satisfy the formula (2A) and satisfy the formula (2B).
3. The hat-shaped steel sheet pile according to claim 1,
the D1 and the D2 satisfy the formula (3A) and satisfy the formula (3B).
4. The hat-shaped steel sheet pile according to claim 1,
the D1 and the D2 satisfy the formula (4A) and satisfy the formula (4B).
5. The hat-shaped steel sheet pile according to claim 1,
the D1 and the D2 satisfy the formula (5A) and satisfy the formula (5B).
6. The hat-shaped steel sheet pile according to claim 1,
an effective width Wmm between the outer end portions in the width direction in each of the pair of arm portions satisfies formula (6), and a distance Hmm in a cross-sectional height direction orthogonal to the width direction in the plan view between a surface of the web portion that faces a side opposite to a cross-sectional gravity center line along the width direction and a surface of the arm portion that faces a side opposite to the cross-sectional gravity center line along the width direction satisfies formula (7),
876≤W≤932…(6)；
H≤400…(7)。
7. the hat-shaped steel sheet pile according to any one of claims 1 to 6,
a distance Lmm between the 3 rd intersection point and the cross-sectional gravity center line, a distance Hmm in the cross-sectional height direction orthogonal to the width direction in the plan view between a surface of the web portion facing the opposite side of the cross-sectional gravity center line in the width direction and a surface of the arm portion facing the opposite side of the cross-sectional gravity center line in the width direction, and a distance Cmm between a surface of the web portion facing the opposite side of the cross-sectional gravity center line in the width direction and the cross-sectional gravity center line satisfy formula (8),
L>H-C…(8)，
the 3 rd intersection point is an intersection point of 2 nd intersection points passing through the pair of flange portions and the center line of gravity of the cross section, and perpendicular lines perpendicular to the pair of flange portions.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017193111 | 2017-10-02 | ||
| JP2017-193111 | 2017-10-02 | ||
| PCT/JP2018/035872 WO2019069776A1 (en) | 2017-10-02 | 2018-09-27 | Hat-shaped steel sheet piling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111032961A true CN111032961A (en) | 2020-04-17 |
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ID=65994217
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880052395.6A Pending CN111032961A (en) | 2017-10-02 | 2018-09-27 | Hat-shaped steel sheet pile |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JP6669309B2 (en) |
| CN (1) | CN111032961A (en) |
| AU (1) | AU2018345052A1 (en) |
| PH (1) | PH12020500110A1 (en) |
| SG (1) | SG11202000245WA (en) |
| TW (1) | TWI685601B (en) |
| WO (1) | WO2019069776A1 (en) |
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2018
- 2018-09-27 TW TW107134084A patent/TWI685601B/en active
- 2018-09-27 AU AU2018345052A patent/AU2018345052A1/en not_active Abandoned
- 2018-09-27 CN CN201880052395.6A patent/CN111032961A/en active Pending
- 2018-09-27 JP JP2019510977A patent/JP6669309B2/en active Active
- 2018-09-27 WO PCT/JP2018/035872 patent/WO2019069776A1/en active Application Filing
- 2018-09-27 SG SG11202000245WA patent/SG11202000245WA/en unknown
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2020
- 2020-01-15 PH PH12020500110A patent/PH12020500110A1/en unknown
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| CN1500941A (en) * | 2002-11-15 | 2004-06-02 | �ձ�������ʽ���� | Metal sheet pile |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP6669309B2 (en) | 2020-03-18 |
| TWI685601B (en) | 2020-02-21 |
| JPWO2019069776A1 (en) | 2019-11-14 |
| PH12020500110A1 (en) | 2020-09-14 |
| AU2018345052A1 (en) | 2020-02-06 |
| SG11202000245WA (en) | 2020-02-27 |
| TW201923198A (en) | 2019-06-16 |
| WO2019069776A1 (en) | 2019-04-11 |
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