JPH0735530U - H-shaped steel sheet pile - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an H-shaped steel sheet pile that has less inclination when driven into the ground and can reduce the use of a deformed steel sheet pile for correcting inclination as compared with the conventional one. [Structure] The soil 24 inside the female joint 22 of the H-shaped steel sheet pile 20 that has been driven in advance is compressed by the male joint 28 of the H-shaped steel sheet pile 26 that is driven adjacent to the soil 24 and the joint 28.
Friction occurs between and. The stationary earth pressure P _0, the area of A ₁ of the cross section of the hollow portion of the female joint, the difference between the area and A ₁ of the cross-section of the flange and the male joint is inserted into the hollow portion of the female joint A _2, contact If the line (dotted line length in FIG. 1) is g, the friction coefficient between soil and steel is f, and the number of fittings per fitting (1 in FIG. 1) is n, the frictional force S per unit length is S. Is S = P ₀ (A
₁ / A ₂ ) × g × f × n, and (A ₁ / A ₂ ) × g
Is a numerical value in the range of 10 or more and 25 or less.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an H-shaped steel sheet pile used for earth retaining walls, river revetments, underground walls, etc. in the field of civil engineering and construction.

[0002]

[Prior art]

 H-shaped steel sheet piles are known that are driven around the foundations of buildings, rivers and coastal structures to prevent the collapse of sediment and the intrusion of water. This H-shaped steel sheet pile is driven into the ground while being connected to each other by well-known construction methods such as the vibro method, press-fitting method, auger triaxial excavation method, and drop-in method after mud excavation.

As the H-shaped steel sheet pile, for example, a hollow-column-shaped female joint is formed at one end of both ends in the width direction of the flange, and a column-shaped male joint having a shape to be inserted into the hollow portion of the female joint is wide. It is known that it is formed at the other end of the direction, and the female joint and the male joint of the adjacent H-shaped steel sheet piles are fitted and connected to each other (see JP-A-4-330113).

[0004]

[Problems to be solved by the device]

However, in the above-mentioned conventional H-shaped steel sheet pile, the earth pressure of the fitting portion when connecting with each other is not taken into consideration. Therefore, as shown in FIG. 9, when a plurality of H-shaped steel sheet piles 10 are driven into the ground with pressure P in the direction indicated by arrow A, the resistance S ₁ on the fitting side is equal to the resistance S ₂ on the free end side. It can be larger. When the resistance S ₁ becomes larger than the resistance S ₂ , a moment in the direction indicated by the arrow M acts on the penetration sheet pile 12. As a result, the penetrating sheet pile 12 inclines in the direction of the normal to driving, which is indicated by the arrow B. When a plurality of H-shaped steel sheet piles are continuously driven into the ground, this inclination becomes large, and the pressure P for driving the H-shaped steel sheet piles is not constant in the horizontal direction but varies. As a result, the work of penetrating the H-shaped steel sheet pile becomes difficult. In order to solve this penetration failure, as shown in FIG. 10, when the inclination becomes large, the deformed steel sheet pile 14 for adjusting the inclination is manufactured and driven according to the inclination. If the frequency of increasing the inclination increases, many deformed steel sheet piles 14 are required, so that there is a problem that the cost increases and the construction period is delayed.

Further, when the resistance S ₁ becomes larger than the force P for driving the H-shaped steel sheet pile 16, as shown in FIG. 11, the H-shaped steel sheet pile 16 to be driven and the adjacent H-shaped steel sheet pile 10 as well. A co-fall phenomenon occurs, which causes the construction yield to drop significantly. In order to prevent this co-descending phenomenon, the H-shaped steel sheet pile 10 is welded to the H-shaped steel sheet pile 18 that is driven in advance of the H-shaped steel sheet pile 10. Due to this welding work, the cost increases and the construction period is delayed.

In view of the above circumstances, an object of the present invention is to provide an H-shaped steel sheet pile which has less inclination when driven into the ground and which can reduce the use of the modified steel sheet pile for inclination correction as compared with the conventional steel sheet pile.

[0007]

[Means for Solving the Problems]

 The H-shaped steel sheet pile of the present invention for achieving the above object is a hollow column having a slot extending in the longitudinal direction, which is formed at one end of both ends of the flange in the width direction along the longitudinal direction of the flange. H-shaped steel sheet pile including: the female joint, and a columnar male joint formed along the longitudinal direction at the other end of the both ends and having a shape inserted into the hollow portion of the female joint. , The female joint and the male joint have a cross-sectional area of the hollow portion of the female joint which is A₁ And the area of the cross section of the flange and the male joint to be inserted into the hollow portion and the A₁ The difference from₂ And the outer peripheral length of the cross section of the flange and the male joint to be inserted into the hollow portion is g, 10 ≦ (A₁ / A ₂ ) × g ≦ 25 is satisfied.

Here, it is preferable to provide a web at a position where the mass of the flange on which the male joint and the female joint are formed is divided into two equal parts.

[0009]

[Action]

 The inventor of the present invention, when making the present invention, causes the inclination and co-descending that occur when the H-shaped steel sheet pile is driven into the ground because the soil inside the joint of the H-shaped steel sheet pile that was previously driven is adjacent. We focused on the point that frictional resistance occurs due to compression when the joint of the H-shaped steel sheet pile that is driven in is inserted.

The frictional resistance of the joints of H-shaped steel sheet piles adjacent to each other will be described with reference to FIG. FIG. 1 is a cross-sectional view showing a joint portion of H-shaped steel sheet piles that are adjacent to each other by cutting the H-shaped steel sheet pile in the width direction. The soil 24 inside the female joint 22 of the H-shaped steel sheet pile 20 that was previously driven is compressed by the male joint 28 of the H-shaped steel sheet pile 26 that is adjacently driven. As a result, friction occurs between the soil 24 and the joint 28. The frictional force S per unit length is expressed by the following formula.

S = P ₀ (A ₁ / A ₂ ) × g × f × n where P ₀ : static earth pressure A ₁ : cross-sectional area of hollow portion of female joint A ₂ : in hollow portion of female joint The difference between the cross-sectional area of the flange and the male joint to be inserted and A ₁ g: Contact line (dotted line length in Fig. 1) f: Friction coefficient between soil and steel n: Number of fits per place ( Based on the above formula, P ₀ and g are fixed, n is set to 1, and the value of (A ₁ / A ₂ ) × g is changed to determine whether or not the penetrability is good. As shown in FIG. 1 / (S / (P ₀ · f)) × 1000 on the vertical axis is the index K indicating the penetrability, and the horizontal axis indicates (A ₁ / A ₂ ) × g.

When (A ₁ / A ₂ ) × g is less than 10, the fitting between the male joint and the female joint becomes loose, so that the H-shaped steel to be driven meanders. On the other hand, when (A ₁ / A ₂ ) × g exceeds 25, the friction between the soil 24 and the joint 28 increases, so that the H-section steel to be driven inclines and also falls together. Therefore, if (A ₁ / A ₂ ) × g is set to a value in the range of 10 or more and 25 or less, loose fitting of the male joint and the female joint can be prevented, and the inclination of the H-shaped steel to be driven can be prevented. The fall can be reduced.

Here, if the web is provided at a position that divides the mass of the flange formed with the male joint and the female joint into two equal parts, the handling becomes easy when the H-shaped steel sheet pile is hung by a crane or the like.

[0014]

【Example】

 Examples of the H-shaped steel sheet pile according to the present invention will be described below. FIG. 3 shows an embodiment of the H-shaped steel sheet pile of the present invention. (A) is a plan view of a type in which a female joint is formed at one end in the width direction of one flange and a male joint is formed at the other end, (b) ) Is a plan view of a type in which a female joint is formed at one end of both flanges in the width direction and a male joint is formed at the other end, and (c) shows a state in which H-shaped steel sheet piles of the type (b) are driven adjacent to each other. It is a top view shown.

In the type shown in FIG. 3A, a hollow columnar female joint 34 is formed at one end of the flange 32 of the H-shaped steel sheet pile 30 in the width direction along the longitudinal direction of the flange 32. Further, the female joint 34 is formed with a slot 36 extending in the longitudinal direction for receiving the adjacent H-shaped steel sheet pile flange 32. At the other end of the flange 32 in the width direction, a columnar male joint 38 having a shape to be inserted into the hollow portion 34a of the female joint 34 is formed.

The H-section steel sheet pile 40 of the type shown in FIG. 3 (b) has the same female joints 44 a, 44 b and a male joint as those shown in FIG. 3 (a) on both flanges 42 a, 42 b, respectively. 46a and 46b are formed. When the adjacent female joints 44a and male joints 44b of the adjacent H-shaped steel sheet piles 40 are fitted and continuously driven, a retaining wall shown in FIG. 3 (c) is formed.

Next, H-shaped steel sheet piles in which female and male joints of various shapes are formed are shown together with comparative examples. FIG. 4 is a plan view showing an H-shaped steel sheet pile of a comparative example, and FIGS. 5 to 8 are plan views showing an embodiment of the H-shaped steel sheet pile of the present invention. Here, A ₁ is the cross-sectional area of the hollow part of the female joint, A ₂ 'is the cross-sectional area of the flange and the male joint inserted into the hollow part of the female joint, and A ₂ is A ₁ and A ₂ ', the contact length is g (see Fig. 1), the outer diameter of the female joint is φ, the wall thickness of the female joint is t, and the wall thickness of the flange is T. The dimensions are given below in mm. (1) FIG. 4 shows an H-shaped steel sheet pile 50 of type 1 which is a comparative example.

A ₁ = 12.6 A ₂ ′ = (4.2 ² −3.2 ² ) × (3.14 / 4) = 8.0 A ₂ = 4.6 g = 4.2 × 3. 14 = 13.0 φ = 60 t = 10 T = 10 The outer diameter of the male joint 52 is 42 mm, and the wall thickness is 5 mm. (2) FIG. 5 shows a type 2 H-section steel sheet pile 40 (see FIG. 3A) as an embodiment.

A ₁ = (6.0-2.0) ² × (3.14 / 4) = 12.6 A ₂ ′ = 3.0 × 1.6 + 1.2 × 1.0 = 6.0 A ₂ = 6.6 g = 20 + 30 + 16 × 2 = 8.4 φ = 60 t = 10 T = 10 The thickness 44 of the male joint 42 is 16 mm and the width 46 is 30 mm. Also, the flange length 48 inserted into the hollow portion of the female joint is 12 mm. (3) FIG. 6 shows a type 3 H-shaped steel sheet pile 60 as an embodiment.

A ₁ = 7.5 × (3.12 / 2) = 44.2 A ₂ '= 6.5 × 1.6 + 4.0 × 1.0 = 14.4 A ₂ = 29.8 g = 6.5 × 2 + 1.6 × 2 = 16.2 φ = 100 t = 12.7 T = 10 The male joint 62 has a wall thickness 64 of 16 mm and a width 46 of 65 mm. Further, the flange length 68 inserted in the hollow portion of the female joint is 40 mm. (4) FIG. 7 shows a type 4 H-shaped steel sheet pile 70 according to an embodiment.

A ₁ = 44.2 A ₂ '= 4 × 1.6 + 4 × 1 = 10.4 A ₂ = 33.8 g = 4.0 × 3.0 + 1.6 × 2 = 10.2 φ = 100 t = 12.7 T = 10 The thickness 74 of the male joint 72 is 16 mm, and the width 76 is 40 mm. Further, the flange length 78 inserted in the hollow portion of the female joint is 40 mm. (5) FIG. 8 shows an H-shaped steel sheet pile 80 of type 5 which is an embodiment.

A ₁ = 44.2 A ₂ '= 4.2 ² × (3.14 / 4) = 13.8 A ₂ = 44.2-13.8 = 30.4 g = 4.2 × 3 .14 = 13.1 φ = 100 t = 12.7 T = 10 The outer diameter of the male joint 82 is 42 mm and the wall thickness is 5 mm.

Table 1 collectively shows the dimensions and the like of the H-shaped steel sheet piles shown in FIGS. 4 to 8.

[0024]

[Table 1]

Further, referring again to FIG. 2, the quality of the penetrability of the above-mentioned types 1 to 5 will be compared. As shown by the black circles in FIG. 2, the examples (types 2 to 5) have good penetrability of 10 ≦ (A₁ / A₂ ) × g ≦ 25, but the comparative example (type 1) is (A₁ / A ₂ ) × g = 35, and thus the penetrability is poor.

[0026]

[Effect of device]

 As described above, in the H-shaped steel sheet pile of the present invention, since the female joint and the male joint are dimensioned to have good penetrability, it is possible to prevent loose fitting of the male joint and the female joint when driving into the ground. , H-shaped steel sheet pile can be reduced in inclination and co-fall.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an H-shaped steel sheet pile of the present invention cut in the width direction.

FIG. 2 is a graph showing a result of an experiment on whether the penetrability is good or bad.

FIG. 3 is a plan view showing an embodiment of the H-shaped steel sheet pile of the present invention.

FIG. 4 is a plan view showing a type 1 H-shaped steel sheet pile of a comparative example.

5 is an enlarged plan view showing a joint of the type 2 H-section steel sheet pile shown in FIG.

FIG. 6 is a plan view showing a type 3 H-shaped steel sheet pile according to an embodiment of the present invention.

FIG. 7 is a plan view showing a type 4 H-shaped steel sheet pile according to an embodiment of the present invention.

FIG. 8 is a plan view showing a type 5 H-shaped steel sheet pile according to an embodiment of the present invention.

FIG. 9 is a schematic diagram showing the resistance on the fitting side and the resistance on the free end side that occur when a plurality of conventional H-shaped steel sheet piles are driven into the ground.

FIG. 10 is a schematic view showing a state in which a deformed steel sheet pile for adjusting inclination is driven in accordance with the inclination when the inclination of the conventional H-shaped steel sheet pile becomes large.

FIG. 11 is a schematic view showing a state in which a co-descending phenomenon in which an adjacent H-shaped steel sheet pile is also lowered together with a conventional H-shaped steel sheet pile to be driven.

[Explanation of symbols]

20, 30, 40, 50, 60, 70, 80 H-shaped steel sheet pile 32, 42a, 42b Flange 22, 34, 44a, 44b Female joint 34a Hollow part of female joint 36 Slot 28, 38, 42, 52, 62, 72,82 Male joint

Claims (1)

[Scope of utility model registration request] 1. A hollow columnar female joint having a longitudinally extending slot formed at one end of the flange in the width direction along the longitudinal direction of the flange, and the other end of the both ends. An H-shaped steel sheet pile having a columnar male joint having a shape to be inserted into a hollow portion of the female joint, formed along the longitudinal direction, in which the female joint and the male joint are the female joint. flange area of the cross section of the hollow portion and a _1, which is inserted a difference between the area of the cross section of the flange and the male joint is inserted into the hollow portion and the a ₁ and a _2, in the hollow portion of the And an H-shaped steel sheet pile satisfying 10 ≦ (A ₁ / A ₂ ) × g ≦ 25, where g is the outer peripheral length of the cross section of the male joint.