JP6615465B2 - Yamadome wall - Google Patents

Description

  The present invention relates to a mountain retaining wall.

In mountain retaining walls that require a water stop function, there are many mountain retaining walls made of ground improvement pillars constructed by mixing solidification materials such as cement with excavated soil outside the ground to be excavated. The mountain retaining wall by the ground improvement column body has the advantages that it is possible to eliminate cut beams and erections and to improve the excavation efficiency by open excavation.
However, in order to secure bending rigidity that can withstand earth pressure and water pressure from the back ground, a part of the adjacent ground improvement pillars are wrapped and integrated to improve the ground without gaps in the entire range of the mountain retaining wall. He was building a pillar.
For example, Patent Document 1 discloses a technique for providing a hollow portion that remains in the ground in a part of the mountain retaining wall when the mountain retaining wall is constructed with the ground improvement column body.

  In Patent Document 1, a mountain wall constructed of ground improvement pillars has a drilling side wall body in contact with the excavation part and a rear side wall body provided on the back ground, and connects the excavation side wall body and the rear side wall body. It is the structure which connected with the body and left the space | gap part (hollow part) with the ground between connection wall bodies. The hollow portion is a connecting wall body, and is divided into a plurality in the direction intersecting with the excavation side wall body.

Japanese Patent Laid-Open No. 4-85413

  However, Patent Document 1 does not describe any specific configuration in consideration of earth pressure and water pressure from the hollow portion.

  An object of this invention is to provide the mountain retaining wall which can resist the earth pressure and water pressure from a hollow part in view of the said fact.

The mountain retaining wall according to the first aspect of the present invention is constructed by a ground excavation wall body constructed by a ground improvement body outside the excavation part, and by a ground improvement body outside the excavation part from the excavation side wall body. The back side wall body, the excavation side wall body, and the back side wall body are connected to the back side wall body, and the hollow portion formed between the excavation side wall body and the back side wall body is divided into a plurality of portions and constructed with a ground improvement body. a plurality of connecting walls which are provided on the excavation side walls, the water in said vent unit has a water draining means for disconnecting the said excavation, the excavation sidewalls body, outer circumferential portions built in the soil improvement of the wrapped multiple columnar, said draining means, Ru drain tube der provided in a portion where the outer peripheral portions of the ground improvement body is wrapped.

According to the first aspect of the present invention, the mountain retaining wall is constructed by connecting the excavation side wall body and the back side wall body with a plurality of connecting wall bodies, and earth pressure and water pressure (hereinafter referred to as earth water pressure) from the back ground of the mountain retaining wall. ). Further, a range surrounded by the excavation side wall body, the back side wall body, and the connecting wall body is a hollow portion. The hollow portion is divided into a plurality of portions by the connecting wall. Thereby, the dimension, shape, etc. of a hollow part can be adjusted by setting appropriately the position of a connecting wall body, the number of construction, etc., and the earth-water pressure from a hollow part can be adjusted.
As a result, the construction volume of the ground improvement body can be reduced, and the man-hours and material cost can be reduced compared to the case of the conventional retaining wall that improves the ground between the excavation side wall body and the back side wall body that are outside the excavation part. Can be reduced.
Moreover, the water level of a hollow part can be lowered | hung with the water draining means provided in the excavation side wall body. By reducing the water level, the water pressure acting on the excavation sidewall body is reduced. Thereby, it is possible to withstand soil water pressure with the excavation side wall body having low bending rigidity and the like.

The invention described in 請 Motomeko 2, in mountain Tomekabe according to claim 1, is connected to the excavation side wall of the embedment depth, or the drilling side walls of the excavation side walls and the connecting wall The side penetration depth is set to be deeper than that of the back side wall body.

According to the second aspect of the present invention, the depth of the excavation side wall is deeper than the depth of the back side wall. Alternatively, the depth of penetration of the excavation side wall body and the connecting wall body on the side connected to the excavation side wall body is set to be deeper than that of the back side wall body.
Thereby, the resistance force which resists the rotational force of a mountain retaining wall produced when a back side wall body receives earth-water pressure from a back ground is increased, and the falling of a mountain retaining wall is suppressed.
Furthermore, since the effect of suppressing the falling of the mountain retaining wall is increased, the distance between the excavation side wall body and the back side wall body can be shortened.

According to a third aspect of the present invention, in the mountain retaining wall according to the first or second aspect , the excavation side wall body includes a reinforcement member inserted into the ground improvement body, and an increase in the thickness of the ground improvement body. The ground improvement body is reinforced by at least one of an inclination in which the head side is inclined to the back side, or a soil buttress constructed in the lower part from the floor surface of the excavation part to the excavation part. ing

According to invention of Claim 3 , the excavation side wall body is reinforced by at least one of the following. A plurality of appropriate reinforcing means may be selected depending on the structure of the mountain retaining wall and the shape of the hollow portion.
That is, a reinforcing member such as H-shaped steel can be inserted into the ground improvement body constituting the excavation side wall body. By the reinforcing member, the bending rigidity of the excavation side wall body is increased, and it is possible to resist soil water pressure in the hollow portion.
Or you may make the thickness of the ground improvement body which comprises an excavation side wall body larger than the thickness of the conventional excavation side wall body. Specifically, the diameter of the ground improvement body can be increased, and a method of constructing a reinforced ground improvement body in parallel with the ground improvement body constituting the excavation sidewall body can be considered. By increasing the thickness of the ground improvement body, the bending rigidity of the excavation side wall body is increased, and the soil water pressure of the hollow portion can be resisted.
Or you may construct | assemble the head side of the ground improvement body which comprises a digging side wall body inclining to the back ground side. By tilting the ground improvement body to the back ground side, the volume of the hollow portion can be reduced and the earth pressure received from the back side can be reduced. As a result, it is possible to resist earth pressure and water pressure from the ground of the hollow portion. Moreover, the site and space on the excavation side generated by inclining to the back side can be effectively used.
Alternatively, a soil buttress may be constructed in the excavation part from the floor surface of the excavation part to the lower part by intersecting with the excavation side wall body. Thereby, the soil buttress can support the excavation side wall body from the excavation part side as a support, and can resist the soil water pressure from the ground of the hollow part.
As a result, the excavation side wall body is reinforced, so that the interval between the connecting wall bodies can be increased.

  Since this invention is set as the said structure, it can provide the mountain retaining wall which can resist the earth pressure and water pressure from a hollow part.

(A) is a top view which shows the basic composition of the mountain retaining wall concerning 1st Embodiment of this invention, (B) is the Y1-Y1 sectional view taken on the line of (A). (A) is sectional drawing which shows the structural example of the draining means which concerns on 1st Embodiment of this invention, (B) is sectional drawing which shows another structural example. (A) is a top view which shows the basic composition of the mountain retaining wall concerning 2nd Embodiment of this invention, (B) is the Y1-Y1 sectional view taken on the line of (A). (A) is a top view which shows the basic composition of the mountain retaining wall concerning 3rd Embodiment of this invention, (B) is the Y1-Y1 sectional view taken on the line of (A), (C) is It is the fragmentary sectional view which expanded the E section of (A). (A) is a top view which shows the basic composition of the mountain retaining wall which concerns on 4th Embodiment of this invention, (B) is the Y1-Y1 sectional view taken on the line of (A), (C) is It is the fragmentary sectional view which expanded the E section of (B). (A) is sectional drawing which shows the basic composition of the mountain retaining wall which concerns on 5th Embodiment of this invention, (B) is the Y1-Y1 sectional view taken on the line of (A). (A) is sectional drawing which shows the basic composition of the mountain retaining wall concerning 6th Embodiment of this invention, (B) is the Y1-Y1 sectional view taken on the line of (A). (A) is sectional drawing which shows the basic composition of the mountain retaining wall which concerns on 7th Embodiment of this invention, (B) is the Y1-Y1 sectional view taken on the line of (A). (A) is sectional drawing which shows the basic composition of the mountain retaining wall concerning 8th Embodiment of this invention, (B) is the Y2-Y2 sectional view taken on the line of (A). (A) is sectional drawing which shows the structural example of the mountain retaining wall which concerns on 9th Embodiment of this invention, (B) is Y1-Y1 sectional view taken on the line of (A), (C) is It is Y2-Y2 sectional view taken on the line of (A). (A) is sectional drawing which shows the structural example of the mountain retaining wall which concerns on 10th Embodiment of this invention, (B) is the Y1-Y1 sectional view taken on the line of (A), (C) is ( It is a Y2-Y2 line sectional view of A).

(First embodiment)
A mountain retaining wall 10 according to a first embodiment of the present invention will be described with reference to FIGS. 1 (A) to 2 (B). Here, FIG. 1A is a plan view of the mountain retaining wall 10, and FIG. 1B is a cross-sectional view taken along line Y1-Y1 of FIG. FIGS. 2A and 2B are cross-sectional views each showing a configuration example of the water draining means.

As shown in FIGS. 1A and 1B, the mountain retaining wall 10 is outside the excavation part 12 and is constructed between the excavation part 12 and the back ground 30.
The mountain retaining wall 10 has an excavation side wall body 14 constructed on the excavation part 12 side.
The excavation side wall body 14 is constructed in a wall shape by wrapping and integrating the outer peripheral portions of the plurality of ground improvement bodies 11. The ground improvement body 11 is constructed by mixing and stirring cement milk and excavated soil while excavating the local ground, and is continuously formed in a columnar shape in the Y-axis direction.

  A rear side wall body 16 is provided in the X-axis direction (back side) of the excavation part 12 from the excavation side wall body 14. Similarly to the excavation side wall body 14, the back side wall body 16 is also constructed in a wall shape by wrapping and integrating the outer peripheral portions of the plurality of ground improvement bodies 11. The back side wall body 16 is constructed in a wall shape in the Y-axis direction in parallel to the excavation side wall body 14 with a distance L1 from the excavation side wall body 14.

The excavation part 12 is excavated at a depth H1 to a position substantially at the center of the excavation side wall 14 downward in the Z-axis direction.
Further, the excavation side wall body 14 and the back side wall body 16 are both constructed from the upper surface of the mountain retaining wall 10 at a construction depth H2 that is deeper than the depth H1 of the excavation part 12. If the portion deeper than the floored surface 12G of the excavation part 12 is called a penetration depth, the penetration depth of the excavation sidewall body 14 and the rear sidewall body 16 is HN1 (HN1 = H2-H1). It becomes.

Between the excavation side wall body 14 and the back side wall body 16, a plurality of connecting wall bodies 18 are constructed in a straight line. The connecting wall body 18 is constructed in a wall shape by wrapping and integrating the outer peripheral portions of the plurality of ground improvement bodies 11.
The connecting wall body 18 is constructed in a wall shape in the X-axis direction between the excavation side wall body 14 and the back side wall body 16, and both ends of the connecting wall body 18 are connected to the excavation side wall body 14 and the back side wall body 16. Each is wrapped.

  The connecting wall body 18 is constructed with a plurality of wall bodies with a distance (width) W <b> 1, and between the adjacent connecting wall bodies 18, a hollow portion 20 that does not improve the ground is formed. That is, the hollow portion 20 is partitioned by a plurality of connecting wall bodies 18 into a rectangular shape having a distance (depth) L1 in the X-axis direction and a distance W1 in the Y-axis direction.

  In the hollow portion 20, the distance W1 in the Y-axis direction is preferably smaller than the distance L1 in the X-axis direction (W1 ≦ L1). Even if the hollow portion 20 is formed in this manner, the mountain retaining wall 10 constitutes the mountain retaining wall 10 because the excavation side wall body 14 and the rear side wall body 16 are connected by the plurality of connecting wall bodies 18. The integration of the ground improvement body 11 is maintained. Thereby, the earth and water pressure from the back ground 30 of the mountain retaining wall 10 can be received, the bending rigidity of the mountain retaining wall 10 can be increased, and the mountain retaining wall 10 can be prevented from collapsing.

  A drainage pipe (drainage means) 22 is attached to the excavation sidewall body 14. A hollow pipe material is used for the drain pipe 22 and has a length penetrating the excavation sidewall body 14 in the X-axis direction. The drain pipe 22 is provided at a position where the height from the ground surface (floored surface) 12G of the excavating part 12 is H3. As will be described later, the drain pipe 22 has a central portion of the outer pipe 34 fixed to the excavation side wall 14, one end inserted into the inside of the hollow section 20, and the other end opened to the space of the excavation section 12. ing.

Thereby, the water of the hollow part 20 can be discharged to the excavation part 12, and the water level 26 of the hollow part 20 can be lowered to the position of the drain pipe 22 lower than the water level 28 of the back ground 30.
As a result, the water pressure from the hollow portion 20 is reduced, and the bending rigidity required for the excavation sidewall body 14 can be reduced.

  In addition, it is good also as a structure which builds the top end concrete 24 on the upper surface of the hollow part 20, and covers the upper surface of all the hollow parts 20 with the top end concrete 24. FIG. The ceiling concrete 24 can prevent rainwater from entering the hollow portion 20.

The drainage pipes 22 and 23 will be described with reference to FIGS.
As shown in FIG. 2A, the drain pipe 22 has a double pipe structure in which an inner pipe 32 is removably inserted into an outer pipe 34.
The outer pipe 34 is formed with a length L3 that is larger than the thickness L2 of the excavation side wall body 14 in the X-axis direction, and the outer peripheral portion is joined to the excavation side wall body 14 with both ends protruding from the excavation side wall body 14. ing.
A drainage filter 36 is inserted into the inner pipe 32. The filter 36 is provided on the side of the hollow portion 20 of the inner pipe 32, prevents outflow of earth and sand from the hollow portion 20, and discharges only water (moisture) 46 from the inner pipe 32. The filter 36 is inserted in a replaceable manner.

Between the outer tube 34 and the inner tube 32, a sealing material 33 for supporting and water stopping is provided. As a result, the inner tube 32 is supported by the outer tube 34 via the seal member 33, and the outflow of earth and sand from between the outer tube 34 and the inner tube 32 is prevented.
Thereby, the water level 26 of the hollow part 20 can be lowered to the lowest part of the opening part of the inner pipe 32. Further, the filter 36 can be easily replaced by supporting the inner tube 32 in a detachable manner with the sealing material 33.

FIG. 2B shows a cross-sectional view of the drain pipe 23. The drain pipe 23 has a configuration in which the filter 40 is filled in the outer pipe 34.
The outer pipe 34 is formed with a length L3 that is larger than the thickness L2 of the excavation side wall body 14 in the X-axis direction, and the outer peripheral portion is joined to the excavation side wall body 14 with both ends protruding from the excavation side wall body 14. ing. Inside the outer pipe 34, a filter 40 for drainage is filled over almost the entire length. The filter 40 prevents the earth and sand from flowing out from the hollow portion 20 and discharges only water (moisture) 46. Thereby, the water level 26 of the hollow part 20 can be lowered to the lowest part of the opening part of the outer pipe 34.

In addition, a core member 38 integrated with the filter 40 in the X-axis direction is provided at the center of the filter 40. Thereby, the filter 40 can be exchanged by holding the core member 38 in hand.
In the present embodiment, any one of the drain pipes 22 and 23 may be used.

By adopting this configuration, it is possible to provide the mountain retaining wall 10 including the excavation side wall body 14, the back side wall body 16, and the plurality of connecting wall bodies 18 and having the hollow portion 20 inside.
Moreover, since the retaining wall 10 has the hollow part 20 which does not improve the ground in the interior, when the conventional retaining wall which improves the ground between the excavation side wall body 14 and the rear side wall body is used. In comparison, the construction volume of the ground improvement body 11 can be reduced, and man-hours and material costs can be reduced.

Further, the water in the hollow section 20 is discharged to the excavation section 12 by the drain pipe 22 provided in the excavation sidewall body 14. Thereby, the water level 26 of the hollow part 20 can be lowered to the position of the water drain pipe 22, and the water pressure acting on the excavation side wall body 14 can be reduced.
As a result, the bending rigidity required for the excavation side wall body 14 can be kept low, so that the soil water pressure from the hollow portion 20 can be resisted.

(Second Embodiment)
A mountain retaining wall 50 according to the second embodiment of the present invention will be described with reference to FIGS. The mountain retaining wall 50 is different from the first embodiment in that a well (deep well) 52 is provided in the hollow portion 20. The difference will be mainly described.
Here, FIG. 3A is a plan view of the mountain retaining wall 50, and FIG. 3B is a cross-sectional view taken along line Y1-Y1 of FIG.

  As shown in FIGS. 3A and 3B, the hollow portion 20 is formed with a well 52 for pumping water. The well 52 is formed from the surface of the retaining wall 50 at a depth H4. The depth H4 is a depth at which the drain pipe 22 is provided, and is a position deeper than the target water level 26 (depth H5).

One well 52 is provided in each of the plurality of hollow portions 20. By providing the well 52 in addition to the drain pipe 22, the amount of water discharged from the hollow section 20 can be increased.
In addition, what is necessary is just to determine the quantity of the well 52 by the height of the water level 28 of the back ground 30, etc. as needed, and you may provide two or more in the same hollow part 20. FIG.

Here, the earth water pressure (the sum of earth pressure and water pressure) will be described.
For example, when the water level 28 of the back ground 30 is at a position of a depth H6 from the surface, the soil water pressure acting on the back side wall body 16 has a distribution like a characteristic 56 shown in FIG. The characteristic 56 shows a tendency to increase as the depth increases, and becomes an inclined straight line. The back side wall body 16 is in contact with the internal ground of the hollow portion 20 and resists soil water pressure of the characteristic 56 together with the internal ground of the hollow portion 20.

On the other hand, the soil water pressure acting on the excavation sidewall body 14 has a water level of 28 when water is not discharged from the hollow portion 20. In this case, the soil water pressure has a characteristic 55 partially indicated by a two-dot chain line, and the excavation sidewall body 14 is required to have a large bending rigidity in order to resist the soil water pressure of the characteristic 55.
Here, if water is discharged from the hollow portion 20, the water level drops to 26. In this case, the soil water pressure acting on the excavation sidewall body 14 has a characteristic 54 indicated by a solid line in a range above the drain pipe. Thereby, the bending rigidity requested | required of the excavation side wall body 14 can be made small.

In the present embodiment, the soil water pressure acting on the excavation sidewall body 14 can be reduced to the characteristic 54. As a result, the bending rigidity required for the excavation side wall body 14 can be kept low, so that the soil water pressure from the hollow portion 20 can be resisted.
That is, it is only necessary to resist the earth pressure from the internal ground of the hollow portion 20, and the bending rigidity can be suppressed low. In addition, the idea with respect to soil water pressure is common to 1st Embodiment and all the embodiments mentioned later. Other configurations are the same as those of the first embodiment, and a description thereof will be omitted.

(Third embodiment)
A mountain retaining wall 60 according to a third embodiment of the present invention will be described with reference to FIGS. The mountain retaining wall 60 is different from the first embodiment in that a main pile horizontal sheet pile 67 is constructed in a part of the excavation sidewall body 62 instead of the drain pipe 22. The difference will be mainly described.
4A is a plan view of the mountain retaining wall 60, FIG. 4B is a cross-sectional view taken along line Y1-Y1 of FIG. 4A, and FIG. 4C is an enlarged view of portion E of FIG. FIG.

As shown to FIG. 4 (A) and (B), the main pile horizontal sheet pile 67 is comprised from the main pile (H-section steel 65, 66) and the horizontal sheet pile 68. As shown in FIG. The main pile horizontal sheet pile 67 is provided in a part of the excavation side wall body 62. The excavation side wall body 62 is constructed by wrapping a part of the outer peripheral portion of the plurality of ground improvement bodies 11 and integrating them in a wall shape except for a part.
One main pile horizontal sheet pile 67 is constructed between the connecting portions to which the connecting wall body 18 is connected (E portion in FIG. 4A). The parent pile (H-shaped steel 65, 66) is constructed to a position deeper than the excavation part depth H1, but the lateral sheet pile 68 is constructed to a position slightly deeper than the floor surface 12G (about 10 cm). Note that the drain pipe 22 described in the first embodiment is not provided.

As shown in FIG. 4 (C), the main pile horizontal sheet pile 67 does not construct one portion of the ground improvement body 11 constituting the excavation side wall body 62, and at the position of the ground improvement body 11 in which the construction is omitted, The H-shaped steel 65 is embedded.
Further, H-section steel 66 is inserted into the ground improvement bodies 11 on both sides of the H-section steel 65 respectively. A horizontal sheet pile 68 is inserted between the H-shaped steels 65 and 66.

Thereby, the water inside the hollow part 20 is discharged to the excavation part 12 from the gap generated in the contact part between the H-shaped steels 65 and 66 and the horizontal sheet pile 68 and the contact part between the horizontal sheet piles 68 (not shown). Is done.
By setting it as this structure, the water level 27 of the hollow part 20 can be lowered | hung to the floor surface 12G of the excavation part 12. FIG.

As a result, the earth and water pressure applied to the excavation side wall body 62 can be reduced, and the bending rigidity required for the excavation side wall body 14 can be kept low, so that the earth and water pressure from the hollow portion 20 can be resisted. .
When the amount of drainage is insufficient, the well 52 described in the second embodiment may be added. Other configurations are the same as those of the first embodiment, and a description thereof will be omitted.

(Fourth embodiment)
A mountain retaining wall 70 according to a fourth embodiment of the present invention will be described with reference to FIGS. The mountain retaining wall 70 is different from the first embodiment in that the H-section steel 72 is inserted into the excavation sidewall body 84. The difference will be mainly described.
5A is a plan view of the mountain retaining wall 70, FIG. 5B is a cross-sectional view taken along line Y1-Y1 of FIG. 5A, and FIG. 5C is FIG. It is sectional drawing to which the E section of was expanded.

As shown in FIGS. 5A and 5B, the excavation sidewall body 84 is constructed by wrapping a part of the outer peripheral portion of the plurality of ground improvement bodies 11 and integrating them into a wall shape. Further, an H-section steel 72 as a reinforcing member is inserted into the ground improvement body 11.
The H-section steel 72 is inserted into all the ground improvement bodies 11 constituting the excavation side wall body 84 and has a depth over the entire construction depth H2 of the ground improvement body 11. In addition, the insertion depth of the H-section steel 72 may be deeper than the construction depth H2 of the ground improvement body 11.

Thereby, the bending rigidity of the excavation sidewall body 84 can be increased. As a result, the soil water pressure from the hollow portion 20 can be resisted.
The H-section steel 72 does not necessarily need to be inserted into all the ground improvement bodies 11, and the dimensions and quantity of the H-section steel 72 are adjusted according to the magnitude of the earth water pressure from the hollow section 20. What is necessary is just to determine bending rigidity.

In the present embodiment, as shown in FIG. 5 (C), the digging side wall body 84 may be provided with an abdomen 74. The erection 74 is provided in the lateral direction from the floor surface 12G of the excavating part 12 at a height H9 (near the central part of the excavating part depth H1).
The flank 74 has a support member 76 protruding from an H-section steel 72 inserted in the excavation side wall body 84, and an H-section steel 78 is attached to the support member 76 in the lateral direction.

Thereby, even if the H-section steel 72 is inserted, the bending rigidity of the excavation side wall body 84 can be further increased in the case where the bending rigidity of the excavation side wall body 84 is insufficient. As a result, the soil water pressure from the hollow portion 20 can be resisted.
Other configurations are the same as those of the first embodiment, and a description thereof will be omitted.

(Fifth embodiment)
A mountain retaining wall 80 according to a fifth embodiment of the present invention will be described with reference to FIGS. The mountain retaining wall 80 is different from the first embodiment in that a reinforcing excavation sidewall body 82 is constructed by wrapping with the excavation sidewall body 14. The difference will be mainly described.
6A is a plan view of the mountain retaining wall 80, and FIG. 6B is a sectional view taken along line Y1-Y1 of FIG. 6A.

As shown in FIGS. 6A and 6B, the excavation sidewall body 82 for reinforcement is constructed by wrapping the excavation sidewall body 14 and the outer peripheral portion toward the excavation section 12 side of the excavation sidewall body 14.
The excavation side wall 82 is constructed by wrapping a part of the outer peripheral portion of the plurality of ground improvement bodies 11 and integrating them into a wall shape. The excavation sidewall body 82 is constructed at the same construction height H2 and the same penetration depth HN1 as the excavation sidewall body 14. Moreover, the excavation side wall body 82 and the excavation side wall body 14 are integrated by lapping outer peripheral parts.
The drainage pipe 22 is formed to have a length penetrating the excavation side wall body 14 and the excavation side wall body 82, and discharges water from the hollow portion 42.

By setting it as this embodiment, since the excavation side wall body 14 is reinforced by the excavation side wall body 82 constructed | assembled by the excavation part 12 side, the number of the connection wall bodies 92 can be reduced.
That is, the distance between the connecting wall bodies 92 can be increased to the distance W2. Here, the distance W2 is larger than the distance W1 of the hollow portion 20 described in the first embodiment.

As a result, even if the area S1 (S1 = L1 × W2) of the hollow portion 42 is larger than the area S2 (S2 = L1 × W1) of the hollow portion 20 described in the first embodiment, the hollow portion 42 is obtained. Can resist soil water pressure from. Thereby, a man-hour and material cost can be reduced.
Other configurations are the same as those of the first embodiment, and a description thereof will be omitted.

(Sixth embodiment)
A mountain retaining wall 90 according to a sixth embodiment of the present invention will be described with reference to FIGS. The mountain retaining wall 90 is different from the first embodiment in that an excavation sidewall body 86 having a large-diameter ground improvement body 88 is constructed at the position of the excavation sidewall body 14 of the mountain retaining wall 10 of the first embodiment. . The difference will be mainly described.
7A is a plan view of the mountain retaining wall 90, and FIG. 7B is a cross-sectional view taken along line Y1-Y1 of FIG. 7A.

As shown in FIGS. 7A and 7B, the excavation sidewall body 86 of the retaining wall 90 is constructed by wrapping a part of the outer peripheral portion of the plurality of ground improvement bodies 88 and integrating them into a wall shape. ing.
The ground improvement body 88 is constructed with a diameter d2 that is larger than the diameter d1 of the ground improvement body 11, and is constructed between the connecting wall bodies 92.

  The excavation side wall 86 is integrated by wrapping both ends with the end of the connecting wall 92 on the excavation part 12 side. At this time, since the excavation side wall body 86 is constructed by the ground improvement body 88 having a larger diameter than the ground improvement body 11, the excavation side wall body 86 has higher bending rigidity than the excavation side wall body 14 of the mountain retaining wall 10.

  In addition, the ground improvement body 88 demonstrated the aspect currently constructed | assembled between the connection wall bodies 92. FIG. However, the present invention is not limited to this, and after the plurality of ground improvement bodies 88 are continuously constructed, the connecting wall body 92 is formed between the excavation side wall body 86 and the back side wall body 16 in the X-axis direction in a wall shape. The both end portions may be wrapped on the excavation side wall body 86 and the back side wall body 16, respectively.

Since the retaining wall 90 of the present embodiment has the diameter d2 of the ground improvement body 88 larger than the diameter d1 of the ground improvement body 11, the bending rigidity is increased. Thereby, the number of the connecting wall bodies 92 can be reduced from the mountain retaining wall 10. For example, the distance W2 between the connecting wall bodies 92 may be wider than the distance W1 of the hollow portion 20 described in the first embodiment.
As a result, even if the area S1 (S1 = L1 × W2) of the hollow portion 44 is larger than the area S2 (S2 = L1 × W1) of the hollow portion 20 described in the first embodiment, the hollow portion 44. Can resist soil water pressure from. Thereby, a man-hour and material cost can be reduced.
Other configurations are the same as those of the first embodiment, and a description thereof will be omitted.

(Seventh embodiment)
A mountain retaining wall 100 according to a seventh embodiment of the present invention will be described with reference to FIGS. The mountain retaining wall 100 is different from the first embodiment in that the depth of penetration HN2 of the excavation side wall body 102 is deeper than the depth of penetration HN1 of the back side wall body 16. The difference will be mainly described.
8A is a plan view of the mountain retaining wall 100, and FIG. 8B is a cross-sectional view taken along line Y1-Y1 of FIG. 8A.

As shown in FIGS. 8A and 8B, the excavation sidewall body 102 is constructed by wrapping a part of the outer peripheral portion of the plurality of ground improvement bodies 104 and integrating them into a wall shape.
The depth of penetration HN2 of the excavation sidewall body 102 is set to be deeper than the depth of penetration HN1 of the excavation sidewall body 14 and the back side wall body 16 of the first embodiment. On the other hand, the head is constructed at the same height as the back side wall body 16.

Thereby, with respect to the rotational force M which is caused when the back side wall body 16 receives the earth and water pressure from the back side ground 30 and tries to rotate the mountain retaining wall 100, the point of action of the force and the fulcrum serving as the center of rotation. The distance can be increased, and the resistance force that resists the rotational force M can be increased.

  As a result, it is possible to increase the resistance to falling of the retaining wall 100 and make it difficult to fall. Furthermore, since the effect of suppressing the falling of the retaining wall 100 is increased, the distance L1 between the excavation sidewall body 102 and the back sidewall body 16 can be shortened. Thereby, a man-hour and material cost can be reduced. Other configurations are the same as those of the first embodiment, and a description thereof will be omitted.

(Eighth embodiment)
A mountain retaining wall 101 according to an eighth embodiment of the present invention will be described with reference to FIGS. The mountain retaining wall 101 is different from the mountain retaining wall 100 in that a part of the excavation sidewall body 102 and the connecting wall body 98 is constructed with a penetration depth HN2. The difference will be mainly described.
Here, FIG. 9A is a plan view of the mountain retaining wall 101, and FIG. 9B is a sectional view taken along line Y2-Y2 of FIG. 9A.

As shown in FIGS. 9A and 9B, the mountain retaining wall 101 includes an excavation side wall body 102, a back side wall body 94, and a connecting wall body 98.
The excavation sidewall body 102 is constructed by wrapping a part of the outer periphery of the plurality of ground improvement bodies 104 and integrating them in a wall shape in the Y-axis direction. The excavation sidewall body 102 is constructed with a penetration depth HN2 and a construction height H8.
The back side wall body 94 is constructed by wrapping a part of the outer periphery of the plurality of ground improvement bodies 96 and integrating them in a wall shape in the Y-axis direction. The back side wall body 94 is constructed with a construction height H7.

The connecting wall body 98 includes a first connecting wall body 126 and a second connecting wall body 128.
The first connecting wall body 126 is constructed by wrapping a part of the outer periphery of the plurality of ground improvement bodies 104 and integrating them in a wall shape in the X-axis direction, and the second connecting wall body 128 is configured by a plurality of ground improvement bodies. A part of the outer periphery of the body 96 is wrapped and integrated into a wall shape in the X-axis direction.

The first connecting wall body 126 has a penetration depth HN2 and a construction height H8, and is constructed on the excavation side wall body 102 side, and one end thereof is overlapped with the excavation side wall body 102 and integrated. The second connecting wall body 128 is constructed at the construction height H7 and is constructed on the back side wall body 94 side, and one end thereof is overlapped with the back side wall body 94 and integrated.
The first connecting wall body 126 and the second connecting wall body 128 are integrated at the central portion of the connecting wall body 98 with the other ends wrapped together.

In this configuration, the construction depth H7 of the back side wall body 94 and the construction depth H7 of the second connecting wall body 128 can be made shallower than the construction depth H2 of the back side wall body 16 of the mountain retaining wall 10. .
Thereby, with respect to the rotational force M that causes the back wall body 94 to rotate the mountain retaining wall 101 caused by receiving earth and water pressure from the back surface ground 30, the point of action of the force and the fulcrum serving as the rotation center The distance can be increased, and the resistance force that resists the rotational force M can be increased.

  As a result, it is possible to increase the resistance to falling of the mountain retaining wall 101 and make it difficult to fall. Furthermore, since the effect of suppressing the falling of the mountain retaining wall 101 is increased, the distance L1 between the excavation side wall body 102 and the back side wall body 94 can be shortened. Thereby, a man-hour and material cost can be reduced. Other configurations are the same as those of the first embodiment, and a description thereof will be omitted.

(Ninth embodiment)
A mountain retaining wall 110 according to a ninth embodiment of the present invention will be described with reference to FIGS. The mountain retaining wall 110 is different from the first embodiment in that it is constructed by tilting the excavation sidewall body 112. The difference will be mainly described.
10A is a plan view of the mountain retaining wall 110, FIG. 10B is a cross-sectional view taken along the line Y1-Y1 of FIG. 10A, and FIG. It is a Y2 line sectional view.

As shown in FIGS. 10A and 10B, the excavation sidewall body 112 is constructed by wrapping a part of the outer peripheral portion of the plurality of ground improvement bodies 108 and integrating them into a wall shape.
The penetration depth HN1 of the excavation sidewall body 112 is the same as the penetration depth of the excavation sidewall body 14 of the first embodiment, and is constructed with the head inclined toward the back ground 30. The inclination angle α may be in the range of angle 45 degrees <α <90 degrees.

FIG. 10C illustrates an example of a joint portion between the excavation sidewall body 112 and the connecting wall body 114.
The excavation side wall body 112 wraps the outer peripheral portion of the ground improvement body 108 constructed to be inclined, and is connected in a wall shape in the Y-axis direction. In addition, the connecting wall body 114 includes a first connecting wall body 130 constructed at the same depth and a second connecting wall body 132 having a different depth.

The first connecting wall body 130 is a structure in which the ground improvement body 11 constructed at the same depth as the back side wall body 16 is connected in a wall shape in the X-axis direction, and the second connecting wall body 132 has a depth. In this configuration, different ground improvement bodies 116 are connected in a wall shape in the X-axis direction.
The second connecting wall body 132 constitutes a connecting wall body 114 near the excavation side wall body 112, and the head of the ground improvement body 116 is disposed on the side closer to the excavation side wall body 112 in consideration of the inclination of the excavation side wall body 112. Build short. When the ground improvement body 108 is constructed, the head of the ground improvement body 116 and the outer periphery of the ground improvement body 108 are wrapped and integrated.

By setting it as this embodiment, the volume of the hollow part 118 can be reduced by the part which inclined the excavation side wall body 112. FIG. Moreover, since the earth pressure from the hollow part 118 can be made small by inclining the excavation side wall body 112 to the back side, it can resist the soil water pressure from the hollow part 118.
Furthermore, the land of the excavation part 12 produced by inclining to the back side and the space AR above the excavation sidewall body 112 can be effectively utilized.
Other configurations are the same as those of the first embodiment, and a description thereof will be omitted.

(10th Embodiment)
A mountain retaining wall 120 according to a tenth embodiment of the present invention will be described with reference to FIGS. The mountain retaining wall 120 is different from the first embodiment in that the soil buttress 122 is constructed in the excavation part 12. The difference will be mainly described.
11A is a plan view of the mountain retaining wall 120, FIG. 11B is a sectional view taken along line Y1-Y1 of FIG. 11A, and FIG. It is a Y2 line sectional view.

As shown in FIGS. 11A to 11C, the soil buttress 122 is constructed by wrapping a part of the outer peripheral portion of the plurality of ground improvement bodies 124 and integrating them in a wall shape.
The soil buttress 122 is constructed on an extension line of the connecting wall body 18, and the end portion of the soil buttress 122 on the side of the excavation side wall body 14 is integrated by wrapping the excavation side wall body 14 and a part of the outer peripheral portion.
The soil buttress 122 is constructed with the same penetration depth HN1 as the excavation side wall body 14, and the head is set to the same height as the floor surface 12G of the excavation part 12.

Thereby, the soil buttress 122 supports the excavation side wall body 14 as a support work from the excavation part 12 side, and resists soil water pressure from the ground of the hollow part 20. As a result, the excavation sidewall body 14 is reinforced and can resist the soil water pressure from the hollow portion 20.
By setting it as this embodiment, the resistance force with respect to the fall of the mountain retaining wall 120 can be enlarged, and it can be made hard to fall down. Furthermore, since the effect of suppressing the falling of the mountain retaining wall 120 is increased, the distance L1 between the excavation side wall body 14 and the back side wall body 16 can be shortened. As a result, man-hours and material costs can be reduced.
Other configurations are the same as those of the first embodiment, and a description thereof will be omitted.

  As mentioned above, although embodiment from 1st Embodiment to 10th Embodiment is described, even if these are combined suitably, it can implement suitably. For example, with respect to the excavation unit 12 that is rectangular in plan view, it is also preferable that one side is the third embodiment and the other three sides are the first embodiment.

  Furthermore, it cannot be overemphasized that it can implement with a various aspect in the range which does not deviate from the summary of this invention.

10, 50, 60, 70, 80, 90, 100, 101, 110, 120 Yamato wall 11, 88, 96, 104, 108, 116, 118, 124 Ground improvement body 12 Excavation part 12G Floor surface 14, 62 , 82, 84, 86, 102, 112 Excavation side wall body 16, 94 Rear side wall body 18, 92, 98, 114, 126, 128 Joint wall body 20, 42, 44, 118 Cavity 22, 23 Drain pipe ( Drainage means)
24 Top concrete 26 Water level inside the hollow section 28 Water level of the back ground 52 Well (water draining means)
67 Parent pile side sheet pile (water draining means)
72 H-section steel (reinforcing member)
122 Soil buttress H1 Excavation depth HN1, HN2 Rooting depth

Claims (3)

An excavation sidewall body constructed of a ground improvement body outside the excavation part;
Outside the excavation part from the excavation side wall body, a back side wall body constructed with a ground improvement body,
Connected to the excavation side wall body and the back side wall body, a plurality of hollow portions formed between the excavation side wall body and the back side wall body and not improved in ground are divided into a plurality of linkages constructed by a ground improvement body. A wall,
A water draining means provided on the excavation side wall body, for draining water from the hollow section to the excavation section;
Have a,
The excavation side wall body is constructed with a plurality of columnar ground improvement bodies wrapped around each other,
The draining means is a drain pipe provided in a portion where the outer peripheral portions of the ground improvement body are wrapped.
Yamadome wall. The penetration depth of the excavation sidewall body or the penetration depth of the excavation sidewall body and the connecting wall body on the side connected to the excavation sidewall body is made deeper than the penetration depth of the back sidewall body. The mountain retaining wall according to claim 1 . The excavation sidewall body is
Insertion of a reinforcing member into the ground improvement body,
Increase in the thickness of the ground improvement body,
Inclining the head side of the ground improvement body to the back side,
Or, in the excavation part, a soil buttress constructed in the lower part from the floored surface of the excavation part,
The mountain retaining wall according to claim 1 or 2 , which is reinforced by at least one of the following.

Images