JP2003213669A - Earth retaining wall structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an earth retaining wall structure capable of reducing a necessary land for construction of a tall earth retaining wall to reduce the cost of the land purchase. <P>SOLUTION: Steel pipe sheet piles 16 continuously set in a standing straight way are mutually connected through joints 16b to construct a steel pipe sheet pile continuous wall 17, a rotational press-in steel pipe pile 23 with blade-like radially extended part having a blade 22 at the tip is rotationarily press-fitted at a certain angle backward from a continuous wall head part 14, and the upper part of the rotational press-in steel pipe pile 23 is connected to the upper part of the steel pipe sheet pile continuous wall 17 in the continuous wall head part 14. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an earth retaining wall structure such as a road retaining wall.

[0002]

2. Description of the Related Art Conventionally, earth retaining walls such as road retaining walls are L
The concrete type retaining wall represented by the type retaining wall is the mainstream.

On the other hand, construction conditions that require construction at a location close to an existing structure (hereinafter, referred to as proximity construction).
It is difficult to install a normal concrete retaining wall in places where construction conditions are severe, such as construction conditions that should reduce the impact on existing traffic and the surrounding environment as much as possible. In such cases, concrete-based wall such as concrete sheet pile, steel pipe sheet pile,
An earth retaining wall having a structure in which a continuous underground wall made of steel wall bodies such as a steel sheet pile, a box-shaped sheet pile, and an H-shaped sheet pile is self-supporting is used.

For example, when widening an existing road, conventionally, the method of FIGS. 21A and 21B (referred to as a third conventional example) is used.
Was taken. That is, in the example shown in FIG.
A self-supporting steel pipe sheet pile (steel structure) 3 (hereinafter, the steel structure is also referred to as S structure) is driven to the underground support layer on the sloping ground 2 at the end 1a of the road 1 to construct a sheet pile wall 4, The sloped ground 2a on the road side is excavated from the wall 4 and widened. However, in this method, it is necessary to suppress the displacement of the ground, and especially when the earth retaining wall has a high wall height and the back earth pressure is large, the specifications of the self-supporting steel pipe sheet pile 3 are determined so as to withstand it. It is an economy.

In the example shown in FIG. 21B, road 1
The area shown by the dotted line (a) including the sloping ground 2 of the end portion 1a of 1 is excavated, and an L-shaped retaining wall (reinforced concrete structure) 6 (hereinafter, a reinforced concrete structure is also referred to as RC structure) is constructed in this excavation portion. Therefore, the road width is expanded. However, this method requires excavation of the ground behind the L-shaped retaining wall (RC structure) 6, and is an unsuitable construction method for close construction.

As an improvement on the above-mentioned drawback, FIG.
~ The first and second conventional examples shown in Fig. 20 are known.

In the first conventional example shown in FIGS. 15 to 17, the road 1 is used.
An example is shown in which a self-supporting steel pipe sheet pile 3 is constructed to construct a mountain retaining wall at the end of the sheet pile, and a concrete wall head 5 is constructed at the upper end of the sheet pile. Moreover, this 1st prior art example WHEREIN: When the wall height of the earth retaining wall is high as shown in the figure, the steel sheet pile continuous wall 3a
In the following, an example is shown in which a ground anchor (ground anchor) 8 which is generally used in the past is adopted. The second conventional example shown in FIGS. 18 to 20 shows an example in which the diagonal retaining pile 10 is used as a spare in the same steel sheet pile continuous wall 3a as described above.

In the earth anchor method of the first conventional example, when the wall height of the earth retaining wall is high, the self-supporting steel pipe sheet pile 3 withstands earth pressure from the rear ground 7 (arrow pointing left in FIG. 17), and In order to suppress the displacement of the continuous wall head 5 in combination with the passive resistance (the arrow pointing right in FIG. 17) of the rooting portion of the steel pipe sheet pile,
On the stable ground on the back surface of the wall, the above-mentioned earth anchors 8 are formed from the upper part of the steel pipe sheet pile 3 to the back at predetermined intervals. Then, pre-stressed concrete (hereinafter also referred to as PC) steel rod (hereinafter also referred to as PC steel rod) or PC
By applying tension to the tension member 11 such as a steel wire,
Tensile material resistance of the ground anchor 8 (friction resistance between the ground anchor fixing portion shown by the diagonally downward arrow in FIG. 17 and the ground) and lateral resistance of soil at the rooting portion of the steel sheet pile continuous wall 3a forming the mountain retaining wall. So, it has a structure that secures the supporting force to support the back earth pressure.

However, in places where construction conditions are severe,
In addition, when the earth anchor 8 shown in the figure is used for construction with a high earth retaining wall, a large pull-out resistance is required, and the anchor length of the earth anchor 8 must be increased. Along with that, a lot of necessary land behind is also needed, so
There is a drawback that the cost of land acquisition is high.

In the case of the second conventional example, an oblique retaining pile 10 using an H-shaped steel pile, a steel pipe pile or the like is driven behind the continuous wall head 5 at a predetermined interval to take out pulling resistance. 20 shows a passive resistance (right arrow in FIG. 20) and a frictional resistance (FIG. 2).
The frictional force between the surface of the retaining pile and the ground of the steel pipe sheet pile indicated by the diagonally downward arrow of 0 acts on the soil retaining wall to support the back surface earth pressure (arrow pointing left in FIG. 20). It has a structure that secures.

However, in the case of the diagonal retaining pile 10 shown in FIG. 20, it is necessary to secure this large pull-out resistance force by the contact frictional force between the pile surface and the ground, that is, the peripheral frictional force of the pile. It will be necessary for an extremely long time. Along with that, there are drawbacks such as the cost of land acquisition becoming large. Note that FIG.
8, the dimensional relationship shown in FIG. 19 will be described later in [003
6] and [0037].

[0012]

As described above, in the structure in which the earth anchor or the diagonal retaining pile for suppressing the displacement of the wall head in the conventional self-supporting earth retaining wall is constructed, the anchor length or the diagonal retaining pile is used. There is a problem that the length of piles will be lengthened and the necessary land will be widened accordingly, and the land acquisition cost will increase accordingly.

An object of the present invention is to provide an earth retaining wall structure that solves the above problems.

[0014]

In order to achieve the above object, the present invention is configured as follows.

A first aspect of the present invention is an earth retaining wall having a main structure of a continuous sheet pile wall formed by continuously connecting self-supporting sheet piles. It is characterized in that the rotary press-fit pile with the blade-shaped expanded portion is installed at an angle of.

A second aspect of the present invention is an earth retaining wall having a main structure of a continuous sheet pile wall formed by continuously connecting self-supporting sheet piles. It is characterized in that the rotary press-fit pile with the blade-shaped expanded portion is installed at an angle of.

A third invention is characterized in that, in the first invention, the upper portion of the sheet pile continuous wall is inclined forward or backward at a predetermined angle.

A fourth invention is characterized in that, in the second invention, an upper portion of the sheet pile continuous wall is inclined forward or backward at a predetermined angle.

In a fifth aspect based on the second or fourth aspect, the rotary press-fitting pile with the blade-shaped expanded portion is connected to the sheet pile continuous wall at an intermediate portion, and the upper portion is rotated from the intermediate connecting portion. It is characterized in that the press-fitting pile is cut off.

In a sixth aspect of the present invention, in any one of the first to fifth aspects, a connecting portion that connects the upper end portion of the rotary press-fitting pile with the blade-shaped expanded portion and the sheet pile continuous wall is a reinforced concrete structure ( RC structure), and at least on the wall surface above the road surface of the sheet pile continuous wall, a reinforced concrete wall is built integrally with the sheet pile continuous wall via studs. Characterize.

In a seventh aspect of the present invention, in any one of the second and fourth aspects of the present invention, the connecting portion for connecting the upper end portion of the rotary press-fitting pile with the blade-shaped expanded portion and the continuous sheet pile wall has a reinforced concrete structure ( (1) RC structure), and at least a portion above the road surface of the rotary press-fitting stake with the blade-shaped expanded portion is covered with a side wall plate made of a decorative plate.

[0022]

According to the present invention, in place of the earth anchor (ground anchor) and the diagonal retaining pile which are installed to suppress the displacement of the head of the earth retaining wall having a high wall height, the rotation having the blade-shaped expanded portion at the tip is used. Rotate the press-fitting pile diagonally from the upper part of the earth retaining wall, and increase the shear resistance of the ground with this blade-shaped expanded portion, so it is necessary for a shorter pile than the conventional earth anchor construction method or diagonal retaining pile type. It realizes a retaining wall structure that can secure pull-out resistance and push-in supporting force, reduce the required site for retaining wall with high wall height, and reduce land acquisition cost.

Further, in the present invention, the earth retaining wall is an underground continuation consisting of a concrete wall body such as a concrete sheet pile or a steel wall body such as a steel pipe sheet pile, a steel sheet pile, a box type sheet pile or an H type sheet pile. It is used in a broad sense, including a structural wall made up of independent walls.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to the drawings by taking as an example the case where the sheet pile is a steel sheet pile and the rotary press-fitting pile with a blade-shaped expanded portion is a steel pipe pile.

1 to 3 show a basic structure of the present invention as a first embodiment.

In the first embodiment shown in each drawing, the road 1
A steel pipe sheet pile continuous wall 17 is constructed by driving a large number of steel pipe sheet piles 16 on the ground to construct a mountain retaining wall at the end. This steel pipe sheet pile continuous wall 17 is constructed in a place where the wall height (h) of the earth retaining wall is particularly high.
6 is equipped with a joint 16b made of a steel pipe having fitting grooves 18 on both side surfaces of the steel pipe sheet pile body 16a in the connecting direction, and the foundation ground 20 in a state where the joints 16b are meshed with each other.
Has been placed in.

In the present invention, in particular, in place of the steel pipe sheet pile continuous wall 17, in place of the earth anchor retainer or the diagonal retainer pile that is generally used in the past, a rotary press-fit having a blade-shaped expanded portion at the tip of the pile. Steel pipe piles are used. As a specific example, in the drawing, a rotary press-fitted steel pipe pile 23 with a blade-shaped expanded portion in which a blade 22 having a predetermined outer diameter (L) is attached to the tip of a steel pipe pile main body 21 is provided behind the steel pipe sheet pile continuous wall 17. It is installed diagonally at a predetermined angle (θ).

The rotary press-fitting steel pipe pile 23 with the blade-shaped expanded portion is
It is a steel pipe pile driven into the ground by a so-called rotary press-fitting method, and the structure of the blade is not particularly limited. In the embodiment of the present invention, the rotary press-fitting steel pipe pile 23 with the blade-shaped expanded portion is
With the aim of maximizing the tip supporting force,
As shown in detail in 4 (A) and (B), the tip of the steel pipe pile main body 21 having a diameter (D) and an inner diameter (D ₁ ) is spirally cut, and the steel pipe is attached to the spiral tip surface 21a. The upper edge near the inner end of the spiral blade 22 having an outer diameter (L) larger than the diameter (D) of the pile body 21 is welded, and the inner edge is welded to the steel pipe pile body 2
1 is projected to the inner diameter side by a predetermined length, and the opening 2 of the inner diameter (L ₁ ) 2
It is configured to have 2b at the center.

As described above, the structure of the blades 22 is arbitrary, but in order to expect a great supporting force for the rotary press-fitted steel pipe pile 23 with the blade-shaped expanded portion, the outer diameter (L) of the blades 22 should be large. It is good to add improvements such as Further, the tip of the steel pipe pile main body 21 to which the blades 22 are welded may be either an open end pile that remains open or a closed end pile that closes the tip. Which is selected depends on the N value of the ground (standard penetration It may be appropriately selected according to various conditions such as the N value by the test), the required supporting force, and the construction situation.

Although the connecting means between the head portion of the steel pipe sheet pile 16 and the upper end portion of the rotary press-fitted steel pipe pile 23 with the blade-shaped expanded portion may be arbitrary, in the first embodiment, the upper end portions of both members are welded or the like. They are connected to each other and embedded in a continuous wall head 24 made of concrete, which is constructed on the upper part of the continuous wall 17 of the steel pipe sheet piles, to be connected. Further, at the lower part of the continuous wall head 24, the steel pipe sheet pile 16 and the rotary press-fitted steel pipe pile 2 with the blade-shaped expanded portion 2 are provided.
A space between 3 is further reinforced by welding a rigid connecting member 25 made of a steel plate or H-shaped steel. As shown in FIG. 2, the rotary press-fitting steel pipe pile 23 with the blade-shaped expanded portion has a predetermined interval W along the continuous wall head portion 24 in the earth retaining wall extension direction, specifically, about 3 of the pile diameter D. It is provided with a double interval (W = 3D).

In the present invention, when the wall height (h) of the earth retaining wall is high as shown in FIG. 1, the steel pipe sheet pile continuous wall 17 is formed from the upper part to the rear side in the same manner as the conventional earth anchor and diagonal retaining pile. By the rotary press-fitting steel pipe pile 23 with the blade-shaped expanded portion, it is possible to suppress the displacement of the continuous wall head 24 in combination with the passive resistance of the rooting portion of the steel pipe sheet pile continuous wall 17 and the rigidity of the self-supporting steel pipe sheet pile 16. Therefore, this earth retaining wall structure withstands earth pressure from the back ground.

Particularly, according to the present invention, the following effects are exhibited.

As shown in FIG. 3, when the rotary press-fitted steel pipe pile with a blade-shaped expanded portion 23 of the present invention is used, the pull-out resistance (indicated by an obliquely upward arrow B) acting on the steel pipe pile 23 is in the soft ground layer. Then, in the diagonal downward arrow C, the shear friction resistance between the surface of the steel pipe sheet pile body 16a and the soft ground, and in the ground support layer 31, indicated by arrow C-1, inside the extension line above the blade outer diameter (L). In addition, it is determined by the shear friction resistance between the ground region around the rotary press-fitted steel pipe pile 23 and the ground outside the ground region.

That is, in the figure, if the rotary steel pipe pile with a blade-shaped expanded portion 23 is press-fitted while rotating according to the direction of the blade 22, the rotary steel pipe pile 23 can be smoothly press-fitted. Further, when a back earth pressure is applied to the steel pipe sheet pile continuous wall 17 and a force that pulls out the rotary steel pipe pile with a blade-shaped expanded portion 23 is applied, in contrast to the pull-out force, in the conventional oblique pile, the oblique pile is used. It is only the resistance due to the friction between the blade and the earth and sand, but the load of the earth and sand on the blade 22 is applied by using the rotary steel pipe pile 23 with the blade-shaped expanded portion of the present invention. further,
Due to the stress against the shearing force generated between the earth and sand to which a force such as the blades 22 lifts up and the surrounding earth and sand, a high pull-out resistance force can be obtained and a back earth pressure can be dealt with.

Rotating steel pipe pile 23 with vane-shaped expanded portion of the present invention 23
The shear resistance in the above is more than the frictional force between the H-section steel or the surface of the steel pipe and the ground in the case where the diagonal retaining pile 10 (shown in FIG. 18) using the conventional H-section steel pile, steel pipe pile, etc. is configured. Since it is several times larger, the pile length can be significantly shortened as compared with the H-shaped steel retaining pile and the steel pipe retaining pile.

Comparison between the first embodiment shown in FIGS. 1 to 3 and the second conventional example shown in FIGS. 18 and 19 is as follows. The condition common to both is that the diameter D of the steel pipe sheet pile is 600 m
m, the depth of the soft layer of the ground is 10 m, the N value is about 3, the support layer has an N value of about 50, the wall height (h) of the earth retaining wall is 6 m, the diameter of both steel pipe piles is φ800 mm, and the wall thickness is 16 mm, the space dimension W of the medium excavated steel pipe pile and the rotary press fit type steel pipe pile is 2.34 m, which is about three times the pile diameter D, and the installation inclination angle θ of both steel pipe piles is 2
It is 0 °.

Under the above-mentioned common conditions, the length of both steel pipe piles according to the present invention and the conventional example required to withstand the back surface earth pressure of both earth retaining walls was compared, and the second conventional example (Fig. 18, Figure 1
In the diagonal retaining pile 10 of 9), its length L ₂ = 67.
m, a land acquisition width (B) of 23 m from the center of the steel pipe sheet pile to the tip of the diagonal retaining pile 10 is required, whereas in the rotary press-fitting steel pipe pile with a blade-shaped expanded portion 23 of the present invention, the length L ₂ =
24m, the land acquisition width (B) from the center of the steel pipe sheet pile to the tip of the rotating steel pipe pile 23 is 8m, which is 23m compared to the conventional
It became -8m = 15m, and it was confirmed that the land acquisition width (B) could be significantly reduced.

Further, a rotary press-fitting steel pipe pile 2 with a blade-shaped expanded portion 2
In the case of the ground anchor of the first conventional example (shown in FIG. 15) which is determined by the shear resistance of the ground as in the case of No. 3, the maximum diameter L ₁ of the anchor drilling hole is about 165 mm, whereas the blade diameter L in the present invention is free. Since the size can be freely changed, the pile length can be shortened by using a large blade diameter against the required pull-out resistance force, which can greatly reduce the cost of land acquisition and the construction period.

4 and 5 show a second embodiment. The second embodiment shows an example in which an existing road is widened by using a steel pipe sheet pile continuous wall 17 whose lower portion is inclined forward.
In this case, the steel pipe sheet pile 16 is driven up to the underground support layer in the middle of the sloping ground 2 at the end 1a of the road 1 to make the steel pipe sheet pile continuous wall 1
7 is constructed and the sloped ground 2a on the road side is excavated from the steel pipe sheet pile continuous wall 17 to widen the width.

In the second embodiment shown in FIGS. 4 and 5, the steel pipe sheet pile continuous wall 17 has a soil retaining steel pipe sheet pile 16 for reducing the earth pressure.
It shows a structure in which the lower part of the is tilted to the road 1 side by 10 ° and installed. On the other hand, the rotary press-fitting steel pipe pile 23 with the blade-shaped expanded portion is provided so as to be inclined by 15 ° on the rear surface side. Structure of steel pipe sheet pile 16 and rotary press-fit steel pipe pile 23 with vane-shaped expanded portion, and continuous wall head 24 made of concrete of both members
The connection structure according to is the same as that of the first embodiment.

According to the method of the second embodiment, the existing road 1 can be widened, and the road 1 is inclined at a predetermined angle to reduce the earth pressure even when the ground condition is displaced, especially when the wall height (h) of the earth retaining wall is high. The earth retaining steel pipe sheet pile 16 and the rotary press-fitting steel pipe pile 23 with the blade-shaped expanded portion formed on the back side thereof can smoothly construct an earth retaining wall capable of withstanding the back earth pressure even when the earth pressure is large.

Further, also in the second embodiment, since the blade diameter L in the rotary press-fitting steel pipe pile 23 with the blade-shaped expanded portion can be freely changed in size by design, a large blade diameter with respect to the necessary pull-out resistance force. By using, the pile length can be shortened, which can significantly reduce the cost of land acquisition and the construction period.

6 to 8 show the third to fifth embodiments. Each of the embodiments is an example in which there is no site behind the earth retaining steel pipe sheet pile 16, and the steel pipe sheet pile 16 is unavoidably rotatably mounted on the front side of the steel pipe sheet pile 16.

In the third embodiment shown in FIG. 6, when there is no site behind the earth retaining steel pipe sheet pile 16, a rotary steel pipe pile 23 with a blade-shaped expanded portion has a tilt angle (θ) of 20 ° on the front side.
The example is set in. In this case, unlike the case where the diagonal pile is provided on the back side, the push-in supporting force is expected for the rotary steel pipe pile with the blade-shaped expanded portion 23. In the case of pushing support force, the vane 22 at the tip of the rotary steel pipe pile with vane-shaped expanded portion 23 exerts a large tip support force, and the safety factor of the push support force is higher than that of the pulling support force. According to the bridge specifications, the pull-out force is always 6 and the push-in force is always 3 which is small. From this point as well, a large supporting force can be obtained, so that the pile length and the ground of the rotary steel pipe pile 23 with the blade-shaped expanded portion The length of insertion into the support layer 31 is short.

In the third embodiment, a steel pipe sheet pile 16 is cast up to the underground support layer in the middle of the sloping ground 2 at the end 1a of the existing road 1 to construct a steel pipe sheet pile continuous wall 17, and the slope side on the road side is constructed. The board 2a is excavated to provide a widened width (W ₁ = 2 m) and a required widened width (W ₂ = 5 m), and is inclined at a predetermined interval in a portion above the road surface of the rotary steel pipe pile 23 with the blade-shaped widening portion. A decorative plate 19 is attached to the front surface of the pile upper portion 23a located at to form a road side wall.

The fourth embodiment shown in FIG. 7 is a steel pipe sheet pile continuous wall constructed by continuously installing the upper portion of the earth retaining steel pipe sheet pile 16 by inclining forward at a predetermined angle (20 ° in the example of the figure). 17
And an earth retaining wall formed by combining a rotary steel pipe pile 23 with a blade-shaped expanded portion that is obliquely installed at an angle (20 ° in the example in the figure) in front of the continuous wall head 24 of the steel pipe sheet pile continuous wall 17. The structure of is shown. Since the other structure is the same as that of the third embodiment of FIG. 6, the same elements are designated by the same reference numerals and the description thereof will be omitted.

With the structure of the earth retaining wall of the fourth embodiment,
A large lateral ground reaction force in the ground can be obtained by the inclination angle of the earth retaining steel pipe sheet pile 16, so that the length of the steel pipe sheet pile 16 to be inserted into the ground can be short, resulting in an economical structure. Also,
In the fourth embodiment, the space (S) closed by the blindfold decorative plate 19 between the upper portion of the earth retaining steel pipe sheet pile 16 and the upper portion of the rotary steel pipe pile 23 with the blade-shaped expanded portion is effective for installing a lifeline or the like. It has available features.

In the fifth embodiment shown in FIG. 8, a steel pipe sheet pile continuous wall 17 made up of earth retaining steel pipe sheet piles 16 which are continuously installed with the upper side inclined forward by a predetermined angle (20 ° in the example of the figure),
The structure of the earth retaining wall which combined the rotating steel pipe pile 23 with a blade-shaped expanded part installed vertically from the continuous wall head 24 of this steel pipe sheet pile continuous wall 17 is shown. Other structures are the third,
Since it is the same as the fourth embodiment, the same elements are denoted by the same reference numerals and the description thereof is omitted.

With the structure of the earth retaining wall of the fifth embodiment,
Since the lateral ground reaction force in the ground can be largely obtained depending on the angle of the earth retaining steel pipe sheet pile 16, the blades located above the road surface have the advantage that the length of the earth retaining steel pipe sheet pile 16 to be inserted into the ground is short. Upper part 2 of rotating steel pipe pile 23
Since 3a is vertical, the effective width of the road width (W ₁ )
There is an advantage that can be taken greatly. Further, also in the fifth embodiment, the space (S) closed by the decorative plate 19 between the earth retaining steel pipe sheet pile 16 and the rotary steel pipe pile 23 with the blade-shaped expanded portion can be effectively used for installing a lifeline or the like. It has features.

Next, FIGS. 9 to 12 show a sixth embodiment.

In the sixth embodiment, as in the third to fifth embodiments, the site necessary for driving the retaining piles behind the earth retaining steel pipe sheet pile 16 cannot be secured and the front surface cannot be stopped. Rotating press-fitted steel pipe pile with vane-shaped expanded part 23
Steel pipe sheet pile continuous wall 1
7 is used to widen the existing road 1, but further, in the sixth embodiment, after the rotary press-fitting steel pipe pile 23 with the blade-shaped expanded portion is placed, in the subsequent step, in the middle of the sloped ground 2 The third to fifth embodiments are that a series of widening operations such as excision of the upper portion 23a of the rotary press-fitted steel pipe pile 23 after excavation, excavation of a road surface, installation of an underground beam, backfilling of an excavated portion are performed. They are different.

That is, in the sixth embodiment, a self-supporting steel pipe sheet pile 16 is driven up to the underground support layer in the middle of the sloped ground 2 at the end 1a of the road 1 to construct a steel pipe sheet pile continuous wall 17.
Further, the front side of the self-supporting steel pipe sheet pile 16 is 10 to 20 degrees.
A rotary press-fitting steel pipe pile 23 with a blade-shaped expanded portion having a blade 22 at the tip is inclined and press-fitted into the ground for a predetermined length. At this time, the steel pipe sheet pile continuous wall 17 and the upper end of the rotary press-fitted steel pipe pile 23 with the blade-shaped expanded portion have an upper height, and are welded, bolted,
It is joined by placing concrete.

Next, the sloped ground 2a on the road side from the earth retaining wall 17 is excavated up to the road surface level over the range indicated by the two-dot chain line (d), and further below the road surface, the two-dot chain line ( Excavate over the range shown in (e). In this way, when excavating the area indicated by the dotted line (d) and the dotted line (e),
When the exposed portion of the rotary press-fitted steel pipe pile 23 with the blade-shaped expanded portion on the front surface of the steel pipe sheet pile 16 hinders the road width, at the bottom surface (under the road surface) of the excavation portion indicated by the dotted line (e) Underground cross beams 28 made of H-shaped steel or steel pipe are installed, and both ends thereof are joined to the side face of the steel pipe sheet pile 16 and the side face of the rotary press-fitted steel pipe pile 23 with the blade-shaped expanded portion by bolting or the like.

Further, the steel pipe sheet pile 1 is provided by the horizontal cross beam 28.
After joining 6 and the rotary press-fitting steel pipe pile 23 with the blade-shaped expanded portion, the (f) portion of the rotary press-fitted steel pipe pile 23 with the blade-shaped expanded portion (the portion above the welded portion of the underground horizontal beam 28. , Figure 1
See 2. ) Is removed. In this way, there is no protrusion on the widened side end of the road, and by further backfilling the excavated portion shown by the dotted line (e) to the same level as the road surface,
Road widening work is completed.

In the sixth embodiment, the rotary press-fitted steel pipe pile 23 with the blade-shaped expanded portion is provided on the front side unlike the back side as in the first and second embodiments. As with the fifth embodiment, the backside earth pressure of the steel pipe sheet pile 16 is supported. That is, this rotary press-fitted steel pipe pile 2 with the blade-shaped expanded portion 2
3 is expected to have indented bearing capacity. Even in this case, the blade outer diameter L in the rotary press-fitted steel pipe pile 23 with the blade-shaped expanded portion
Since the size can be freely changed, the pile length can be shortened by using a large blade diameter against the indentation resistance force, which can significantly reduce the construction period.

FIG. 13 shows a seventh embodiment. In this 7th Embodiment, the composite structure by RC of the steel pipe sheet pile continuous wall 17a and the rotary press-fitting steel pipe pile 23 with the blade-shaped expanded part cast | injected as a diagonal pile on the front side of this is 1st-6th implementation. It differs from the form.

In the seventh embodiment, the end 1a of the road 1
A steel pipe sheet pile 16a such as a self-supporting steel pipe sheet pile or a U type sheet pile is cast up to the underground support layer in the middle of the sloped ground 2 to construct the steel pipe sheet pile continuous wall 17a. Furthermore, a self-supporting steel sheet pile 1
6a is inclined to the front side by 10 ° to 20 ° and the blade 2 is attached to the tip.
Rotationally press-fitting steel pipe pile 23 with blade-shaped expanded portion having 2 is press-fitted into the ground for a predetermined length. At this time, the steel pipe sheet pile continuous wall 17
a and the upper end of the rotary press-fitting steel pipe pile 23 with a blade-shaped expanded portion are in contact with each other at an upper height.

Next, the sloped ground 2a on the road side from the steel pipe sheet pile continuous wall 17a is excavated up to the road surface level over the range shown by the dotted line (g), and the exposed steel pipe sheet pile continuous wall 17a is covered with a vertical road side wall (mountain retaining). Wall).

Further, an underground cross beam 30 of RC member is used below the road surface where a part of the road surface is partially excavated, and both ends of the underground cross beam 30 and the side face of the steel sheet pile 16a and the rotary press-fitted steel pipe pile 2 with the blade-shaped expanded portion 2 are provided.
By joining to No. 3, the steel sheet pile 16a and the rotary press-fitting steel pipe pile 23 with the blade-shaped expanded portion are joined by the RC underground cross beam 30. After installing the underground horizontal beam 30 in this way, the position shown by the dotted line (h) of the rotary press-fitting steel pipe pile 23 with the blade-shaped expanded portion exposed above the road surface level is cut off.

Before or after cutting off the position indicated by the dotted line (h) of the rotary press-fitted steel pipe pile 23 with a blade-shaped expanded portion, a reinforced concrete wall 29 is placed along the front surface of the steel pipe sheet pile continuous wall 17a. Then, RC synthesized with studs
Construct a composite wall structure that integrates members and sheet piles. In particular, when the steel pipe sheet pile continuous wall 17a is constructed from U-shaped steel sheet piles, the strength may be insufficient with only steel sheet piles against the back surface earth pressure. However, a composite wall structure of RC and steel sheet piles should be used in this way. By improving the rigidity of the steel sheet pile itself,
It is possible to realize a structure in which the displacement of the head of the earth retaining wall is suppressed and the section of the steel sheet pile is reduced to reduce the cost.

When the steel sheet pile 16a is made of a steel pipe sheet pile, the composite wall structure of RC and sheet pile improves the rigidity of the wall. Therefore, the rigidity required for the steel pipe sheet pile is correspondingly increased. Can be reduced. Furthermore, by using a composite wall structure in which the steel sheet pile wall is covered with concrete, the so-called uneven shape of the surface of the steel sheet pile wall is hidden and a flat concrete plane is created, so the landscape surface of this earth retaining wall is also improved. It

[0062]

According to the present invention, a rotary steel pipe pile having a blade-shaped expanded portion at the tip is used instead of the ground anchor and the diagonal retaining pile installed to suppress the displacement of the head of the earth retaining wall with a high wall height. By driving diagonally from the upper part of the earth retaining wall and increasing the shear resistance of the ground in the enlarged portion, it is possible to secure the necessary pull-out resistance and push-in support force with short piles. In addition to the above effects, the construction period can be greatly shortened, and the required site for the earth retaining wall with a high wall height can be reduced to construct an earth retaining wall that reduces the cost of land acquisition. To be done.

[Brief description of drawings]

FIG. 1 is a side view illustrating an earth retaining wall structure according to a first embodiment of the present invention.

FIG. 2 is an explanatory plan view of FIG.

FIG. 3 is a side view showing a pull-out resistance force acting on a steel pile in the earth retaining wall structure of FIG. 1.

FIG. 4 is a side view showing an earth retaining wall structure according to a second embodiment of the present invention.

5 is an explanatory plan view of FIG. 4. FIG.

FIG. 6 is an explanatory side view of the earth retaining wall structure according to the third embodiment of the present invention.

FIG. 7 is a side view of an earth retaining wall structure according to a fourth embodiment of the present invention.

FIG. 8 is an explanatory side view of the earth retaining wall structure according to the fifth embodiment of the present invention.

FIG. 9 is an explanatory side view showing a first construction step of the earth retaining wall structure according to the sixth embodiment of the present invention.

10 is an explanatory plan view of FIG.

FIG. 11 is a side view showing the second construction step of the earth retaining wall structure according to the sixth embodiment of the present invention.

12 is an explanatory plan view of FIG. 11. FIG.

13 (A) and 13 (B) are side views showing the first and second construction steps of the earth retaining wall structure according to the seventh embodiment of the present invention.

14 (A) and 14 (B) are an enlarged side view and an enlarged sectional view of a tip blade portion of a steel pile in the present invention.

FIG. 15 is a side view for explaining the earth retaining wall structure of the first conventional example.

16 is an explanatory plan view of FIG.

FIG. 17 is a side view showing pull-out resistance force acting on the steel pile in the earth retaining wall structure of FIG. 15.

FIG. 18 is a side view for explaining the earth retaining wall structure of the second conventional example.

19 is an explanatory plan view of FIG.

20 is an explanatory side view showing pull-out resistance force acting on the steel pile in the earth retaining wall structure of FIG. 18. FIG.

21 (A) and (B) are side views showing the first and second construction steps of the earth retaining wall structure of the third conventional example.

[Explanation of symbols]

1 road 1a end 2 sloping ground 2a Sloping ground 3 steel pipe sheet pile 4 sheet pile wall 5 continuous wall head 6 L type retaining wall 7 back ground 8 Earth anchor 10 diagonal retaining piles 11 Tensile material 12 diagonal retaining piles 16 steel sheet pile 16a Steel pipe sheet pile body 16b joint 17 Steel pipe sheet pile continuous wall 18 Fitting groove 19 makeup plates 20 foundation ground 21 Steel pipe pile body 22 feathers 23 Rotary press-fitting pile with vane-shaped expanded part 24 continuous wall head 25 rigid members 28 Underground horizontal beams 29 Reinforced concrete wall 30 underground horizontal beams 31 Ground support layer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kenji Saikai             20-1 Shintomi, Futtsu City Nippon Steel Co., Ltd.             Inside the surgical development headquarters (72) Inventor Takashi Hirata             20-1 Shintomi, Futtsu City Nippon Steel Co., Ltd.             Inside the surgical development headquarters (72) Inventor Yu Hirashima             20-1 Shintomi, Futtsu City Nippon Steel Co., Ltd.             Inside the surgical development headquarters (72) Inventor Seio Kitamura             3948 Nunoshida, Kochi City, Kochi Prefecture Co., Ltd.             Giken Factory (72) Inventor Tetsuo Minami             3948 Nunoshida, Kochi City, Kochi Prefecture Co., Ltd.             Giken Factory (72) Inventor Hiroyuki Yasuoka             1-38 Ariake, Koto-ku, Tokyo Co., Ltd.             Giken Factory (72) Inventor Ikoma Kimura             1-38 Ariake, Koto-ku, Tokyo Co., Ltd.             Giken Factory F-term (reference) 2D049 EA02 FB03 FB14 FC03 FE06

Claims (7)

[Claims] 1. A soil retaining wall having, as a main structure, a continuous sheet pile wall formed by continuously connecting self-supporting sheet piles, the blade being behind the sheet pile continuous wall at a predetermined angle from the head of the sheet pile. Soil retaining wall structure characterized by the installation of rotary press-fitting piles with a circular expansion part. 2. A soil retaining wall having a main structure of a continuous sheet pile wall formed by continuously connecting self-supporting sheet piles, the blade being provided on the front surface of the continuous sheet pile wall at a predetermined angle from the head of the sheet pile. Soil retaining wall structure characterized by the installation of rotary press-fitting piles with a circular expansion part. 3. The earth retaining wall structure according to claim 1, wherein an upper portion of the sheet pile continuous wall is inclined forward or backward at a predetermined angle. 4. The earth retaining wall structure according to claim 2, wherein an upper portion of the sheet pile continuous wall is inclined forward or backward at a predetermined angle. 5. The rotary press-fitting pile with a blade-shaped expanded portion is connected to the sheet pile continuous wall at an intermediate portion, and the upper rotary press-fitting pile is cut off from the intermediate connecting portion. The earth retaining wall structure according to claim 2 or 4. 6. A connecting portion for connecting an upper end portion of the rotary press-fitted pile with the blade-shaped expanded portion and the sheet pile continuous wall is integrally built with a reinforced concrete structure (RC structure), and at least the sheet pile. The reinforced concrete wall is constructed integrally with the sheet pile continuous wall via a stud or the like on the wall surface above the road surface of the continuous wall, and the stud concrete wall is provided therebetween. Earth retaining wall structure. 7. A connecting portion for connecting the upper end portion of the rotary press-fitted pile with the blade-shaped expanded portion and the continuous sheet pile wall is integrally constructed with a reinforced concrete structure (RC structure), and at least the blade. The earth retaining wall structure according to any one of claims 2 and 4, wherein a portion above the road surface of the rotary press-fitting pile with the enlarged diameter portion is covered with a side wall plate made of a decorative plate. .