JPH10152841A - Shearing wall and method of building thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem inherent to a sheathing wall composed of a row of poles and to restrain a horizontal displacement caused by a side pressure from the natural ground. SOLUTION: A sheathing wall is composed of sheathing wall bodies 7 made of a ground improving material which is composed of excavated mud and a solidified material which are agitated and kneaded so as to be built into a wall-like shape having a predetermined thickness, by continuously moving a bucket-ladder excavator composed of a cutter post, an endless chain which is wound around to outer periphery of the cutter post and on which cutting and agitating pawls are projected, counterforts 8 made of a ground improving material and built into a wall-like shape on the natural ground side of the sheathing wall bodies 7. The length of the counterforts 8 in a plan view, located in the lengthwise middle parts of the sheathing wall bodies 7 are longer than that near the opposite end sides. Further, the counter forts 8 located in the lengthwise middle part of the sheathing wall bodies 7 are densely arranged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retaining wall constructed when a foundation of a structure is constructed and constructed by ground improvement, and a construction method thereof.

[0002]

2. Description of the Related Art As shown in FIGS. 12 and 13, a retaining wall constructed by a ground improvement of a stirring and mixing processing method is conventionally constructed by one to three constructions.
It is constructed by a column-type ground improvement that continuously connects about two pillars on a plane while overlapping them in two directions, and in addition to a shape where the pillars are continuous in two directions without a gap as shown in the figure, a lattice It is formed in a shape arranged in a shape or truss shape,
The retaining wall composed of the pillars has the following problems inherent to the pillars.

[0003] In some soils, such as sandy grounds, which have the property of rapidly developing the strength of soil cement, the strength of the column structure constructed in advance becomes large, and the resistance of the improved structure which has been constructed during overlap construction is reduced. As a result, misalignment of adjacent column bodies is likely to occur, and the constructed improved body after curing is easily damaged by the overlap construction. This is remarkable when lapping is performed on holidays.

When the improvement depth is large, it is difficult to maintain the verticality due to the above-mentioned reason and the construction accuracy, and a lap defect such as a gap is generated between the columns arranged adjacently at a deep position. And water leakage between the columns also occurs.

[0005] In addition, in the ground where the cohesive soil and the gravel layer are alternated, the excavation and stirring device itself causes a misalignment at the transition from the cohesive soil to the gravel layer due to a difference in resistance received from the ground, resulting in poor lapping. Sometimes.

[0006] If the misalignment occurs, the shear strength of the wrap portion is extremely reduced, so that it is impossible to expect a resistance to a shear force during an earthquake. Even if wrapping could be carried out as planned, the wrapped portion of the columnar body with a circular cross-section is still a sudden change in cross-section, so a mountain retaining wall with a columnar array arranged in a grid or truss shape There remains an essential problem in that the wrap is structurally weak against horizontal forces during an earthquake.

[0007] Further, since the ground improvement body has a low tensile strength, there is a possibility that the ground improvement body may be tensilely broken by a tensile force applied to the ground side by a lateral pressure from the ground.

[0008] Further, since the overturning moment acts on the lower end of the row of columns located on the opposite side of the ground due to the lateral pressure from the ground, the column row on the ground rises.
The retaining wall itself may fall. The fall of the retaining wall is likely to occur when there is no room for increasing the thickness of the site on the back side of the retaining wall, and the width of the entire retaining wall is reduced.

For this reason, when constructing a self-standing mountain retaining wall using a conventional columnar body, it is necessary to increase the wall thickness in order to increase the resistance against tensile force. It is necessary to increase the diameter of the pillars or arrange a plurality of pillars in the wall thickness direction as shown in Fig. 14, and the construction becomes complicated. It can be applied only to small mountain retaining walls.

[0010] In addition to the mountain retaining wall formed by the columnar body, a self-standing mountain retaining wall having a constant wall thickness in the length direction suffers from a horizontal displacement that increases at the middle portion as shown by a curve in FIG. Although it occurs, it is necessary not to hinder the foundation work of the structure, so it is necessary to suppress the horizontal displacement so that the absolute amount is less than a certain value, so from this meaning it is necessary to increase the wall thickness .

The present invention has been made in view of the above background and proposes a mountain retaining wall which solves the problems inherent in the columnar structure, suppresses the amount of horizontal displacement due to lateral pressure from the ground, and has a large resistance to lateral pressure. It is.

[0012]

According to the first aspect of the present invention, a cutting post and an endless chain, which is stretched around the outer periphery of the cutter post and has an endless chain provided with a cutting stirrer, are continuously moved while cutting the soil. The reinforced wall body of the ground improvement body which is constructed by stirring and mixing the solidified material and has a constant thickness in the width direction and is continuous in the shape of a wall, and on the ground side of the reinforced wall body, the longitudinal direction of the reinforced wall body Lap construction by a method in which the column body is connected to the wall by forming the retaining wall from the retaining wall of the ground improvement body constructed into the wall by stirring and mixing the cutting soil and the solidified material at intervals To solve the problems of misalignment and gaps caused by the above, and avoid a decrease in shear strength.

[0013] Since at least the retaining wall main body is formed in a wall shape having a constant thickness in the width direction, there is no sudden change in the cross section from the retaining wall main body. This eliminates the problem of the columnar body in addition to eliminating the occurrence of water leakage from the ground due to the occurrence of the misalignment and the generation of the gap as described above.

Since the mountain retaining wall main body is formed in a wall shape having a certain thickness, and the inner periphery of the mountain retaining wall main body is formed of a straight line, the mountain retaining wall main body is formed from a column array having irregularities on its inner peripheral surface. The effective area of the target site for foundation work will be larger than when walls are constructed.

Further, since the retaining wall is composed of the retaining wall main body and the retaining wall on the ground side thereof, the bending rigidity of the retaining wall increases, and the bending of the retaining wall main body due to the lateral pressure received from the ground after the completion of the retaining wall is completed. Deformation is reduced. As a result, the wall thickness of the retaining wall main body required to suppress the horizontal displacement amount due to the lateral pressure to a certain amount or less can be reduced, and the frame cost of the retaining wall can be reduced.

According to a second aspect of the present invention, the length of the retaining wall formed at intervals in the longitudinal direction of the retaining wall main body is determined by the horizontal displacement amount generated in the retaining retaining wall main body due to the lateral pressure received from the ground after root cutting. The bending rigidity of the middle part of the retaining wall main body is increased by making the length of the retaining wall located at the intermediate part of the retaining wall main body, where the horizontal displacement amount increases, larger than the length of the retaining wall located near both ends. Increase and reduce the amount of horizontal displacement of the middle part of the retaining wall main body.

In claim 3, claim 1 or claim 2
In the same manner as in the second aspect, the arrangement of the retaining wall is made to correspond to the horizontal displacement amount due to the lateral pressure generated in the retaining wall main body, and the interval between adjacent retaining walls in the middle portion of the retaining wall main body is set to be adjacent to both ends. By making the spacing between the buttress walls smaller than the rest and densely arranging the butting walls at the middle part, the bending rigidity of the middle part of the fastening wall body is increased and the horizontal displacement of the middle part of the fastening wall body is reduced.

According to a fourth aspect of the present invention, a prestress is introduced into a part of the buttress wall near the ground in the depth direction to offset the tensile force of the retaining wall body due to the lateral pressure received from the ground.
Enhance the tensile strength of the retaining wall body and increase the safety against tensile failure.

The prestress is introduced in the depth direction by tensioning a tension member inserted in the depth direction from the upper end of the buttress wall into a part of the buttress wall. The tendon is tensioned with its lower end anchored in or at the lower end of the buttress, and the upper end of the tendon is anchored at the upper end of the buttress.

According to a fifth aspect of the present invention, the lower end of the tendon is extended to penetrate the lower wall and penetrate deeper into the ground, and an anchor is connected to the lower end of the tendon to connect the anchor to the lower wall. The tension member is tensioned while being fixed to the deeper ground, and the retaining wall is fixed to the ground near the ground to prevent its rising, and to prevent the retaining wall from falling due to the falling moment. The upper end of the tendon material is fixed to the upper end of the retaining wall body.

The tendon material stabilizes the retaining wall against lifting by applying a pulling force of the retaining wall due to the overturning moment to the ground, and prevents the retaining wall from overturning. The fall can be prevented even when the entire width of the retaining wall is small.

According to a fifth aspect of the present invention, since the tension member is tensioned while the anchor body is fixed to the ground, prestress is introduced into the retaining wall, and the safety of the retaining wall main body against tensile failure is enhanced. .

According to the sixth aspect of the present invention, the retaining wall according to any one of the first to third aspects mixes the cut soil and the solidified material while continuously moving the above-mentioned trench apparatus. To build a continuous retaining wall body with a constant thickness in the width direction, and agitate and mix the cutting soil and solidified material on the ground side with a space in the longitudinal direction of the retaining wall body The construction is completed by constructing a retaining wall of a wall-shaped ground improvement body.

According to a fourth aspect of the present invention, as described in the seventh aspect, after the mountain retaining wall according to any one of the first to third aspects is constructed, the retaining wall is formed on a part of the buttress near the ground. Before the curing, a tendon is inserted from the upper end in the depth direction of the retaining wall, and the lower end of the tendon is fixed in the retaining wall or at the lower end thereof. After the retaining wall is cured, the tendon is tensioned and retained. It is completed by introducing prestress in the depth direction near the ground of the wall.

According to a fifth aspect of the present invention, as described in the eighth aspect, after the mountain retaining wall according to any one of the first to third aspects is constructed, the retaining wall is formed at a part of the buttress near the ground. Before the hardening, the tension member connected to the anchor body at the lower end is inserted in the depth direction of the stay wall, penetrating the upper end from the lower end to the ground deeper than the stay wall, and the anchor body is fixed to the ground, and the stay wall is fixed. After hardening, the tension material is strained to fix the buttress to the ground near the ground.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. The digging apparatus 1 is composed of a cutter post 2 and an endless chain 3 having a cutting stirrer 4 that is circulated around the outer periphery of the cutter post 2, and the cutter post 2 is mounted on a frame 6 by a hydraulic cylinder mounted on a base machine 5.
Is moved in the horizontal direction by using the base machine 5 as a reaction force, and the circulating cutting stirrer 4 cuts the ground into a groove while discharging the solidified material discharged from the cutter post 2 or supplied from the ground. The ground is improved by mixing the cutting soil, and the retaining wall main body 7 is constructed.

In the case of a slurry, the solidified material is discharged from near the lower end of the cutter post 2 or injected from near the ground. In the case of powder or pellets, a predetermined amount is sprayed on the ground in advance, or is injected or sprayed from the side near the ground where the endless chain 3 penetrates into the ground.

As shown in the left side of FIGS. 1 and 2, the retaining wall 9 according to the first aspect comprises a retaining wall main body 7 of a ground improvement body and a retaining wall 8 of the ground improvement body. By continuously moving the groove device 1, it is constructed in a wall shape having a constant thickness in the width direction as shown in FIGS. The mountain retaining wall body 7 is not limited to the case where it is continuous in a straight line as shown in the figure, but may be continuous in a wave shape.
Are oriented in a direction orthogonal or intersecting with the length direction of the retaining wall main body 7 and are constructed at intervals in the longitudinal direction of the retaining wall main body 7.

FIGS. 1 and 2 show that the retaining wall 8 also has a constant thickness in the width direction by continuously moving the trench apparatus 1 or by circulating the endless chain 3 while keeping it at a fixed position. Although the case where it is constructed in the shape of a holding wall is shown, since the retaining wall main body 7 is constructed to have a constant thickness, the waterproofness required for the retaining wall and a constant strength are secured, and the retaining wall 8 is provided. However, since the water blocking property is not a problem, the retaining wall 8 does not necessarily need to be constructed by the trench apparatus 1, but can also be constructed by connecting the columnar bodies linearly as shown in FIGS. You. Hereinafter, FIGS. 6, 8 and 10 show the case where the retaining wall 8 is constructed by the digging device 1, and FIGS. 7, 9 and 11 show the case where the retaining wall 8 is constituted by a column body.

In the upper retaining wall 9 shown in FIG. 7, a part of the retaining wall 8 connected to the retaining wall main body 7 is composed of two columns in the width direction. Also, when constructing the ground improvement body, the ground improvement body that can be constructed at one time may be overlapped in the width direction.

The retaining wall 8 does not necessarily need to be constructed to the same depth as the retaining wall main body 7, and exhibits an effect of reducing bending deformation generated along the depth direction of the retaining wall main body 7 due to lateral pressure from the ground. Fig. 10 and Fig. 11
In some cases, a depth up to the depth of the root bottom may be sufficient as shown in FIG.

On the left side of FIG. 2, a tensile force acts on the connection portion C between the retaining wall main body 7 and the retaining wall 8 due to the lateral pressure B acting on the back surface of the retaining wall main body 7 along with the root cutting. If the distance A between the retaining walls 8, 8 is set so that an arching effect occurs on the ground sandwiched between the retaining walls 8, 8, for example, by suppressing the distance A between the walls 8, 8 to a certain level or less, the lateral pressure B is reduced. Therefore, the effect of reducing the tensile force at the connection portion C is obtained.

According to the second aspect of the present invention, according to the first aspect, as shown in FIGS. 6 and 7, the length on the plane of the retaining wall 8 at the intermediate position of the retaining wall main body 7 is changed to a bending curve shown in FIG. In this case, the length of the retaining wall 8 at both ends is made larger than the length of the retaining wall 8, and the invention of claim 3 is connected to the left and right mountain retaining wall bodies 7 in FIGS. This is the case where the butting walls 8 in the middle part of the retaining wall main body 7 are densely arranged like the butting walls 8. The left and right retaining walls 9 in FIG. 6 and the right retaining wall 9 in FIG. 7 are also a combination of the retaining wall 9 of claim 2 and the retaining wall 9 of claim 3.

According to a fourth aspect of the present invention, in the first to third aspects, as shown on the right side of FIGS. 1 to 4, a tension member 10 is inserted in a part of the buttress wall 8 near the ground in the depth direction, The retaining wall 9 is a retaining wall 9 in which prestress is introduced near the ground of the retaining wall 8 due to the tension of the tension member 10. Strainer 10 is located near the ground on the retaining wall 8
Books or a plurality of books are arranged.

As the tension member 10, not only a PC steel material such as an unbonded PC steel rod or a PC strand, but also a tensile material such as a reinforcing bar or a steel bar is used. When the sheath is inserted into the stay wall 8, the tendon 10 need not be unbonded.

A fixing plate is provided at the upper end and the lower end of the tension member 10, respectively.
11 and 11 are connected, and the fixing plate 11 at the upper end is fixed to the upper end of the butting wall 8 after or after curing.
As shown in FIGS. 1 and 3, the fixing plate 11 at the lower end is directly fixed to the lower end or the lower end of the retaining wall 8 or the intermediate portion of the retaining wall 8 by curing. Since the range in which the prestress is applied may be a range in which a tensile force is generated in the retaining wall 8, the fixing plate 11 at the lower end may be disposed in an intermediate portion above the lower end of the retaining wall 8. The area of the fixing plate 11 is
The tension applied to the fixing plate 10 is set so that the bearing force acting on the retaining wall 8 from the fixing plate 11 falls within the bearing strength of the retaining wall 8.

After constructing the retaining wall 9 according to any one of claims 1 to 3, the tension member 10 has a depth from the upper end to the lower end before the setting wall 8 which is a mixture of the cutting soil and the solidified material is hardened. The fixing plate 11 at the lower end is fixed to the lower end portion or the intermediate portion of the retaining wall main body 7 by curing, and then tensioned, and the upper end is fixed to the fixing plate 11 at the upper end.

According to the fourth aspect, after the retaining wall 8 is prestressed by the tension of the tension member 10, the ground inside the retaining wall main body 7 is excavated.

As shown in FIG. 15 (a), with the root cutting inside the mountain retaining wall main body 7, the cross section of the mountain retaining wall 9 has a compressive force on the root cutting side and a tensile force on the ground side due to lateral pressure from the ground. Is generated. A compressive stress due to its own weight is also applied to the cross section of the retaining wall 9 as shown in FIG.
If a tensile stress is generated on the tensile side due to a combination of the bending moment and the compressive stress due to its own weight, the straight retaining wall 9 may be fractured by bending.

On the other hand, by applying a prestress to the ground side of the retaining wall 8 before the root cutting, the tensile force on the ground side after the root cutting is completely canceled out, as shown in FIG. 15- (b). Then, only the compressive stress acts on the cross section of the retaining wall 9. As a result, the resistance to the bending moment of the retaining wall 9 increases, and the safety against breakage increases.

According to a fifth aspect of the present invention, in the first to third aspects, as shown in FIGS. 8 to 11, an anchor body 12 is connected to the lower end of the tension member 10 of the fourth aspect, and the anchor body 12 is mounted on the ground. This is a retaining wall 9 in which the retaining wall 8 is fixed to the ground near the ground by fixing. A fixing plate 11 is connected to the upper end of the tension member 10.

The tendon 10 penetrates from the upper end to the lower end of the retaining wall 8, penetrates to the good ground deeper than the retaining wall 8, and is tensioned with the anchor body 12 connected to the lower end fixed to the ground. The fixing wall 8 is fixed to the ground. The fixing plate 11 at the upper end of the tension member 10 is fixed to the upper end of the butting wall 8 in the same manner as in the fourth aspect. 8 and 9 show the case where the depth of the retaining wall 8 is equal to the depth of the retaining wall main body 7, and FIGS. 10 and 11 show the case where the depth of the retaining wall 8 is smaller than the depth of the retaining wall main body 7.

FIG. 11 shows a tension member to which the anchor body 12 is connected.
FIG. 8 to FIG. 8 show the case where only 10 is placed in the
Reference numeral 10 denotes a case where, in addition to the tendon 10 to which the anchor body 12 is connected, the tendon 10 whose lower end is fixed to the lower end of the stay wall 8 is inserted through the stay wall 8.

In the present invention, the retaining wall 9 according to any one of claims 1 to 3 is constructed, and before hardening of the retaining wall 8, after the ground into which the anchor body 12 is inserted is drilled to the insertion depth, The tendon 10 to which the anchor body 12 is connected is inserted.
The anchor body 12 is inserted into the hole, the grout material is filled in the hole, and the anchor body 12 is fixed to the ground. After the retaining wall 8 is hardened, the tension member 10 is tensioned, and the anchor plate 11 at the upper end is fixed. Be established.

At the same time as the retaining wall 8 is fixed to the ground by the tension of the tension member 10, prestress is introduced into the retaining wall 8 in the depth direction.

[0046]

According to the first to third aspects of the present invention, while continuously moving a digging apparatus formed of an endless chain, which is provided on a cutter post and an outer periphery thereof and has a cutting stirrer protruding therefrom,
A ground retaining wall body of a ground improvement body constructed into a wall having a certain thickness by stirring and mixing the cutting soil and solidified material, and a retaining wall of a ground improvement body constructed in a wall shape on the ground side. Since the mountain retaining wall is constructed from the above, the problem of the generation of the center deviation and the gap due to the lapping of the mountain retaining wall constructed by connecting the columnar body and the water leakage after the root cutting due to the lapping work is solved.

Further, since at least the retaining wall main body is formed in a wall shape having a constant thickness in the width direction, there is no sudden change in the cross section from the retaining wall main body, so that a decrease in the shear strength of the retaining wall main body is avoided. Also, there is no structural weakness to horizontal force during an earthquake.

For the above reasons, in order to secure a certain performance as the retaining wall, it is not necessary to continuously connect the column in two directions without any gap as in the case where the retaining wall is constituted by the column, so the construction cost is reduced. Is reduced.

In addition, since the mountain retaining wall main body is formed in a wall shape having a certain thickness, the inner periphery of the mountain retaining wall main body is formed of a straight line. The effective area of the target site for foundation work will be larger than when walls are constructed.

Furthermore, the bending rigidity of the retaining wall is increased by forming the retaining wall body from the retaining wall main body and the retaining wall on the ground side thereof. Therefore, the bending of the retaining wall main body due to the lateral pressure received from the ground after the root cutting after the completion of the retaining wall is completed. Deformation can be reduced. As a result, the wall thickness of the retaining wall main body required to suppress the horizontal displacement amount due to the lateral pressure to a certain amount or less can be reduced, and the frame cost of the retaining wall can be reduced.

According to the second aspect, the length of the retaining wall located at the intermediate portion of the main body of the retaining wall where the amount of horizontal displacement is large is made larger than the length of the retaining wall located near both ends.
In the third aspect, the interval between adjacent buttress walls in the middle portion of the retaining wall body is made smaller than the interval between adjacent butting walls near both ends, thereby increasing the bending rigidity of the intermediate portion of the retaining wall body. Therefore, in each case, the amount of horizontal displacement of the middle portion of the retaining wall main body can be reduced.

According to a fourth aspect of the present invention, a prestress is introduced into a part of the retaining wall close to the ground in the depth direction to offset a tensile force due to a side pressure received from the ground by the mountain retaining wall main body. And the safety against tensile fracture is increased.

As a result of the increase in the tensile strength of the continuous ground improvement body on the ground side, the wall thickness of the continuous ground improvement body can be made smaller than when no prestress is introduced, and this is economical.

In a fifth aspect, the tendon of the fourth aspect is extended,
By penetrating the buttress and penetrating to the ground deeper than that, connecting the anchor body to the lower end of the tendon, and introducing tension to the tendon with the anchor fixed to the ground deeper than the buttress, Since the retaining wall is fixed to the ground near the ground, it is possible to prevent the retaining wall from falling over due to lateral pressure from the ground.

According to the fifth aspect of the present invention, since the tension member is tensioned in a state where the anchor body at the lower end of the tension member is fixed to the ground, prestress is introduced into the retaining wall, so that the tensile strength of the retaining wall main body is broken. Also increases safety.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a retaining wall according to claims 1 and 4 when a retaining wall is constructed by a digging device.

FIG. 2 is a plan view of FIG.

FIG. 3 is a longitudinal sectional view showing the retaining wall according to claims 1 and 4 in a case where the retaining wall is formed of a column body.

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is an elevation view showing a state of ground improvement by a trench apparatus.

FIG. 6 is a plan view showing the retaining wall according to claims 2 and 3 when the retaining wall is constructed by a digging device.

FIG. 7 is a plan view showing the retaining wall according to claims 2 and 3 when the retaining wall is formed of a columnar body.

FIG. 8 is a longitudinal sectional view showing the retaining wall according to claim 5 when the retaining wall is constructed by a digging device.

FIG. 9 is a longitudinal sectional view showing the retaining wall according to claim 5 when the butting wall is formed of a columnar body.

FIG. 10 is a longitudinal sectional view showing another retaining wall according to claim 5 when the retaining wall is constructed by a digging groove device.

FIG. 11 is a view showing a case where the butting wall is formed of a column body.
It is a longitudinal cross-sectional view which showed another mountain retaining wall.

FIG. 12 is a longitudinal sectional view showing a mountain retaining wall composed of a columnar body.

FIG. 13 is a plan view of FIG.

FIG. 14 is a plan view showing a state of deformation of a self-supporting mountain retaining wall composed of a columnar body.

FIG. 15 (a) is a longitudinal sectional view showing the relationship between lateral pressure and bending moment acting on a retaining wall due to root cutting, and FIG. 15 (b) shows a composite response generated in a section of the retaining wall when prestress is applied. FIG.

[Explanation of symbols]

1 ... Drilling groove device, 2 ... Cutter post, 3 ... Endless chain, 4 ... Cutting stirrer claw, 5 ... Base machine, 6 ...
… Frame, 7… Mounting wall body, 8… But wall, 9…
... Mounting wall, 10 ... Tensioner, 11 ... Fixing plate, 12 ... Anchor body.

Claims (8)

[Claims] The cutting soil and the solidified material are agitated and mixed while continuously moving a digging device comprising an endless chain provided with a cutter agitating claw projecting from a cutter post and an outer periphery thereof. The earth retaining wall body of the ground improvement body that is constructed and continuous in a wall shape having a constant thickness in the width direction, and the cutting soil at the ground side of the earth retaining wall body at intervals in the length direction of the mountain retaining wall body. A mountain retaining wall composed of a retaining wall of a ground improvement body constructed into a wall shape by stirring and mixing the solidified material. 2. The retaining wall according to claim 1, wherein the length of the retaining wall located at the intermediate portion in the longitudinal direction of the retaining wall main body is greater than the planar length of the retaining wall located near both ends. 3. The retaining wall according to claim 1, wherein an interval between adjacent retaining walls in a longitudinally intermediate portion of the retaining wall main body is smaller than an interval between adjacent retaining walls near both ends. 4. A part of the buttress near the ground is penetrated by the tendon from the upper end of the butter in the depth direction, and the lower end of the tendon is fixed to the inside of the butter or at the lower end thereof. The retaining wall according to any one of claims 1 to 3, wherein the tension member is tensioned, and a prestress is introduced in the depth direction near the ground of the retaining wall. 5. A tension member having an anchor connected to a lower end thereof penetrates from the upper end to the lower end of the buttress wall in a depth direction at a part of the buttress near the ground, and the anchor is deeper than the buttress. The retaining wall according to any one of claims 1 to 3, wherein the retaining member is fixed to the ground, the tension member is tensioned, and the retaining wall is fixed to the ground near the ground. 6. The cutting soil and the solidified material are agitated and mixed while continuously moving a cutter post and an excavation groove device formed of an endless chain protruding from a cutter post and an outer periphery thereof and having a cutting stirrer. Construct a mountain retaining wall body of a ground improvement body that is continuous in a wall shape with a certain thickness in the width direction, and on the ground side,
The retaining wall according to any one of claims 1 to 3, wherein the retaining wall of the wall-shaped ground improvement body is constructed by stirring and mixing the cut soil and the solidified material at intervals in the longitudinal direction of the retaining wall main body. To complete the mountain retaining wall construction method. 7. After the retaining wall according to any one of claims 1 to 3 is constructed, a part of the buttress near the ground is
Before the curing, a tendon is inserted from the upper end in the depth direction of the buttress, and the lower end of the tendon is fixed to the inside of the buttress or to the lower end thereof. 7. The method for constructing a retaining wall according to claim 6, wherein a prestress is introduced in the depth direction near the ground. 8. After constructing the retaining wall according to any one of claims 1 to 3, a part of the buttress near the ground is
Before the hardening, penetrate the upper end from the lower end to the ground deeper than the buttress, insert the tendon with the anchor body connected to the lower end in the depth direction of the buttress, fix the anchor body to the ground,
7. The method of constructing a retaining wall according to claim 6, wherein after the curing of the retaining wall, the tension member is tensioned to fix the retaining wall to the ground near the ground.