JP4812324B2 - Retaining wall and its construction method - Google Patents

Retaining wall and its construction method Download PDF

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JP4812324B2
JP4812324B2 JP2005113760A JP2005113760A JP4812324B2 JP 4812324 B2 JP4812324 B2 JP 4812324B2 JP 2005113760 A JP2005113760 A JP 2005113760A JP 2005113760 A JP2005113760 A JP 2005113760A JP 4812324 B2 JP4812324 B2 JP 4812324B2
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retaining
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pile
buttress
ground
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JP2006291575A (en
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鹿糠嘉津博
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有限会社カヌカデザイン
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  The present invention relates to a retaining wall and a construction method thereof, and more particularly, to a retaining wall of a wet construction method and a construction method thereof capable of omitting the construction of a large footing and exhibiting high rigidity.

  It is necessary to install a retaining wall to prevent the ground from collapsing on cliffs caused by cuts exceeding 2m in height, embankments exceeding 1m in height, etc. Arise. This type of retaining wall consists of a reinforced concrete wall or a wall made of precast products or concrete blocks.

  Such retaining walls are usually designed with an overall L-shaped or T-shaped cross section, and a relatively large foundation footing is formed at the bottom of the retaining wall. The foundation footing functions to ensure a wide contact area for transmitting the load acting on the retaining wall (earth pressure) and the weight of the retaining wall to the supporting ground and to prevent the retaining wall from falling.

  Since the foundation footing extends relatively large toward the high ground side, it is necessary to excavate the high ground extensively during the retaining wall construction and backfill the excavated portion after the retaining wall construction. However, extensive excavation and backfilling of high ground causes problems such as a great amount of excavation work, an increase in the amount of moving soil, and instability of backfill soil. In addition, depending on the environment, conditions, or topography of the construction site, it may be difficult to construct a large foundation footing.

In order to solve such a problem of foundation footing construction, a retaining wall structure of a dry construction method configured to apply a load to the ground pile and to apply a bending moment on the non-falling side to the parent pile in advance is Japanese Patent No. 28824217. It is disclosed in the issue publication. This retaining wall has a structure in which a reinforced concrete structure weight or beam is formed in the groove by excavating a weight construction groove on the natural ground side, and this weight and the parent pile directly under the retaining wall are connected by a support beam. However, a retaining wall such as a PC plate is formed between the parent piles. According to such a retaining wall structure, a bending moment acts on the parent pile due to the load of the weight, and the strength of the retaining wall is increased by the adhesive force and frictional force of the supporting beam and the weight against the ground, and thereby the foundation footing. It may be possible to omit the construction.
Patent No. 2824217

  However, the retaining wall of Patent Document 1 is a retaining wall of a dry construction method in which a lower end portion of a main pile (steel material) is embedded in the ground and a wall element (such as a PC plate) is spanned between the upper portions of the main pile. However, the earth pressure of the high ground and the weight of the wall component can only be absorbed or supported by the deformation of the wall and the reaction force generated in the locking portion of the parent pile and the wall component. Absent.

  Moreover, in the retaining wall of the said patent document 1, the moment of the non-falling side is given to a retaining wall by making a steel bracket protrude from the upper part of a main pile to the high ground side, and building a weight in the front-end | tip part of a bracket. However, the bracket is a linear member, and the joint between the bracket and the parent pile is only a fulcrum for pin support, and therefore, the frictional force of the ground cannot be effectively used.

  The retaining wall of Patent Document 1 also has a structure in which a main pile (usually an H-shaped steel material used for mountain retaining work (temporary work)), a steel bracket, and a face material such as a PC plate are assembled. It is only provided and each component is not integrated as a rigid body. For this reason, depending on the structure of such a retaining wall, the effect of enduring earth pressure in the entire retaining wall cannot be obtained. In addition, the retaining wall of Patent Document 1 using steel as the shaft assembly member is difficult to avoid rusting of the steel material, and this needs to be improved in terms of the service life of the retaining wall.

  The present invention has been made in view of such circumstances, and the object of the present invention is to integrate the components of the retaining wall so that the resistance to the earth pressure of the high ground is effective and long-term as a whole. Retaining wall that can reduce the amount of excavated soil, waste soil and backfill soil, and can reliably prevent the retaining wall from falling by displacing the center of gravity of the retaining wall to the non-tumbling side It is to provide a construction method.

To achieve the above object, the present invention supports the earth pressure of the high ground by columns, piles and walls, and prevents the collapse of the high ground.
The column is composed of a reinforced concrete structure standing column constructed immediately above the pile, and the pile and the column constitute a vertical axis member aligned vertically,
A reinforced concrete buttress made of inverted triangular wall is integrated with the back of the vertical shaft member,
The adjacent vertical shaft members are integrally interconnected by a first foundation of a reinforced concrete structure that supports the vertical load of the wall, and the foundation is a continuous beam-shaped rectangular section with a main bar and a stirrup bar. A horizontal axis member having a beam form and interconnecting the vertical axis members;
The second base of the reinforced concrete structure that integrally interconnects the front ends of the adjacent buttresses is integrally constructed at the front end of the buttress, and the second foundation is a beam in which the main reinforcement and the stirrup reinforcement are arranged. It has a continuous beam shape with a square-shaped cross section,
The spaced apart vertical shaft members are integrally connected by first and second foundations arranged in parallel along the wall core, and the vertical shaft members, the first foundation, the buttress and the second foundation are integrally formed. The retaining wall is characterized in that a rigid frame having a square shape in plan view is formed.

The present invention also supports the earth pressure of the high ground by pillars, piles and walls, and in the construction method of the retaining wall which prevents the collapse of the high ground,
After the piles are constructed along the wall core of the retaining wall, a column of reinforced concrete structure is formed immediately above each pile to form vertical axis members, and adjacent vertical axis members are integrated with each other. Constructing the first foundation of the reinforced concrete structure that is connected and the main bar and stirrup bar are arranged in the form of a continuous beam with a beam-shaped square section, and constructing a horizontal frame member of the retaining wall,
A buttress with a reinforced concrete structure that extends from the back of the column to the back of the retaining wall and consists of an inverted triangular wall is constructed, and the tips of adjacent buttresses are interconnected together and the main and scalloped muscles are arranged. A second foundation of a reinforced concrete structure having a continuous beam shape with a straight beam-shaped cross section is integrally constructed at the tip of the buttress, and the spaced vertical shaft members are arranged in parallel along the wall core. Integrally connected by the first and second foundations, thereby forming an integral and planar rigid framework comprising the vertical shaft member, the first foundation, the buttress and the second foundation;
A method for constructing a retaining wall is provided, wherein the wall body is constructed on the first foundation.


According to the said structure of this invention, the axis | shaft group of a retaining wall is comprised from the vertical axis | shaft member which consists of a pillar and a pile, and the horizontal axis | shaft member which mutually interconnects vertical axis | shaft group members integrally. The wall body is constructed on the horizontal axis member, and the weight of the wall body is transmitted to the pile and the ground directly below through the horizontal axis member. The earth pressure of the high ground mainly acts on the wall body, and the load acting on the wall body is transmitted to the shaft assembly member and supported by the supporting force of the pile. Reinforced concrete columns and foundations withstand soil corrosion and maintain the desired strength over a relatively long period of time. Therefore, the retaining wall of the present invention exhibits the strength against the earth pressure of the high ground effectively and for a long time as the entire retaining wall.

The reinforced concrete buttress displaces the center of gravity of the retaining wall toward the high ground due to its own weight, and prevents the retaining wall from falling due to the frictional force between the buttress wall surface and the ground. And the 2nd foundation of a reinforced concrete structure is integrally constructed in the tip part of a buttress. The second foundation applies a load to the tip of the buttress and displaces the center of gravity of the retaining wall further to the high ground side. The load on the second foundation and the buttress acts to give the non-falling side stress to the column and prevent the retaining wall from falling. The second foundation connects adjacent buttresses together. According to such a configuration, the falling of the retaining wall can be prevented by the cooperative action of a plurality of buttresses, and the separated vertical shaft members (columns and piles) are integrated by the first and second foundations. And the rigidity of the entire retaining wall against earth pressure can be improved.

  Furthermore, since the retaining wall of the present invention has a configuration in which the footing extending to the high ground side is omitted, it is only necessary to excavate only a range where the shaft assembly member, the wall body, and the buttress can be constructed. Therefore, according to the present invention, the ground excavation process and labor can be shortened or reduced, and the amount of excavated soil, waste soil, and backfill soil can be reduced. The reduction of the excavated soil volume is extremely advantageous in practice because it simultaneously eliminates the problems associated with the reduction of the moving soil volume and the instability of the backfill soil. Moreover, since the retaining wall of this invention can apply footing to the terrain where construction is difficult, the applicable range of a retaining wall expands greatly.

  According to the present invention, the constituent elements of the retaining wall are integrated, and the resistance to the earth pressure of the high ground is effectively and fully demonstrated as the entire retaining wall, and the amount of excavated soil, waste soil and backfill soil is reduced. And the retaining wall which can displace the gravity center of a retaining wall to the non-falling side, and can prevent the retaining wall to fall reliably, and its construction method can be provided.

Preferably, the cross sections of the columns and piles are preferably designed to have the same shape or similar shapes in consideration of the continuity of the reinforcing bars and workability. For example, the column is composed of a reinforced concrete column having a circular section or a polygonal section, the pile is a cast-in-place concrete pile having a circular section or a polygonal section, and the main bar of the column is fixed to the concrete of the pile, The main bar of the pile is fixed to the concrete of the pillar.

  As the wall structure, a PC block (precast concrete block) masonry structure of a wet construction method can be preferably employed. Reinforcing bars are arranged in the joints (and hollow parts) of the PC block, and the joints (and hollow parts) of the PC block are filled with cement mortar. Fix to the concrete of the shaft assembly. As a modification, the wall body may be constructed of a PC plate or a reinforced concrete structure wall.

  In this specification, the terms “vertical” and “horizontal” do not necessarily mean strict vertical and horizontal, but may be generally horizontal or vertical in light of the actual state of civil engineering and construction work. It should be understood that tilting is allowed.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a perspective view showing the basic configuration of the retaining wall of the present invention.

  The retaining wall 1 includes a column 2 having a circular cross section disposed at an interval in the wall core direction. A pile 3 is arranged directly below the pillar 2. The axes of the pillar 2 and the pile 3 are aligned, and the pillar 2 and the pile 3 are aligned vertically. The column 2 is a vertical upright column having a reinforced concrete structure, and the pile 3 is a cast-in-place concrete pile having a circular cross section. The pillar 2 and the pile 3 constitute a vertical shaft assembly member of the retaining wall 1.

  A first foundation 4 of a reinforced concrete structure interconnecting the column bases of the column 2 extends in the direction of the wall core of the retaining wall 1. The foundation 4 has a rectangular beam-shaped cross section, and has bending rigidity and shear rigidity that can withstand the vertical load of the wall body 6. The foundation 4 constitutes a horizontal axis member of the retaining wall 1 that interconnects adjacent vertical axis members (columns 2 and piles 3). Retaining wall PC blocks (precast concrete blocks) 5 are stacked on the foundation 4. The PC block 5 is constructed according to a known wet masonry method in which longitudinal and horizontal reinforcing bars are arranged in joints and hollow parts, and then cement mortar is filled in the joints and hollow parts.

  A buttress (retaining wall) 7 is arranged behind the pillar 2. The buttress 7 is made of a reinforced concrete wall body integrated with the back surface of the column 2 and protrudes from the back surface of the column 2 to the high ground G side. The upper end surface 7a of the buttress 7 extends horizontally toward the high ground G side, and the lower end surface 7b of the buttress 7 extends obliquely upward from the column base portion of the column 2 toward the high ground G side. The inverted triangle form of the buttress 7 with the base of the right triangle (upper end surface 7a) arranged on the upper side is compared with the conventional buttress form extending along the footing (the right triangle with the bottom of the right triangle arranged on the lower side). , Notably different.

  A second foundation 8 having a reinforced concrete structure is formed in the ground G. The base 8 interconnects the front ends of the buttress 7. The foundation 8 has a rectangular beam-shaped cross section and extends in the direction of the wall core.

  The main bars (longitudinal bars) of the column 2 extend through the foundation 4 into the pile 3 and are fixed to the concrete of the foundation 4 and the pile 3. The main reinforcement (vertical reinforcement) of the pile 3 extends through the foundation 4 into the pillar 2 and is fixed to the concrete of the foundation 4 and the pillar 2. The vertical bars of the wall body 6 extend into the foundation 4 and are fixed to the concrete of the foundation 4, and the horizontal bars of the wall body 6 extend into the column 2 and are fixed to the concrete coat of the column 2. The pillar 2, the pile 3, the foundation 4, and the wall body 6 constitute an integral earth retaining wall that can withstand the earth pressure of the high ground G. Further, the reinforcing bars of the buttress 7 are fixed to the concrete of the pillar 2, the pile 3 and the foundation 4, and are fixed to the concrete of the foundation 8. The buttress 7 and the foundation 8 are integrated with the pillar 2, the pile 3 and the foundation 4 so as to be able to transmit stress.

2 is a plan view (FIG. 2A), a beam plan view (FIG. 2B) and a pile plan view (FIG. 2C) showing an embodiment of the retaining wall 1 having the basic configuration shown in FIG. 3 is a side view showing each component of the retaining wall 1. FIG. 4 is a cross-sectional view taken along the line II of FIG. 2, and FIG. 5 is a cross-sectional view taken along the line II-II of FIG. FIG. 6 is a cross-sectional view and a front view showing the reinforcing bars (rebar arrangement) of the wall body 6 and the pillar 2. 7, 8, and 9 are axial views of the retaining wall 1. 7 shows a shaft set of the front portion of the retaining wall 1, and FIGS. 8 and 9 show a shaft set of the end portion of the retaining wall 1 bent toward the high ground G side.
As shown in FIGS. 2 and 7 to 9, the retaining wall 1 of the present embodiment is arranged in a planar form corresponding to the topography of the high ground G, and the left and right ends are bent toward the high ground G side. The retaining wall 1 surrounds the high ground G and prevents the high ground G from collapsing or collapsing to the low ground L side (FIG. 1A). As shown in FIGS. 8 and 9, the stepped portion of the foundation 4 that may occur at the end of the retaining wall is corrected by the bulge portion 4 c due to concrete beating.

  As shown in FIG. 2 (B), the foundation 8 is buried in the high ground G. As shown in FIG. 3, the buttress 7 is disposed so as to interconnect the foundation 8 and each pillar 2. The wall body 6 extends between the pillars 2, and a foundation 4 (indicated by phantom lines) that supports the wall body 6 is constructed at the level of the low ground L along the arrangement of the pillars 2. As shown in FIG. 3, the foundation 4 slightly protrudes from the pillar 2 to the high ground G side and the low ground L side, but the width W of the foundation 4 is much smaller than that of the conventional retaining wall footing. The lateral protrusion dimensions W1 and W2 of 4 are set to very small dimensions.

  As shown in FIG. 2C and FIG. 3, the pile 3 is disposed immediately below each column 2 and extends below the foundation 4. As shown in FIG. 4, both the pillar 2 and the pile 3 have a circular cross section, and the axes (vertical center axes) of the pillar 2 and the pile 3 coincide. For this reason, the main reinforcement 2a of the pillar 2 extends through the foundation 4 into the pile 3 and is fixed to the concrete of the foundation 4 and the pile 3, and the main reinforcement 3a of the pile 3 penetrates the foundation 7 into the pillar 2. It extends and settles on the concrete of the foundation 7 and the pillar 2. Therefore, the main reinforcing bars 2a and 3a of the pillar 2 and the pile 3 can ensure a sufficient fixing length without performing processing such as bending.

  The foundation 8 has a main muscle 8a extending in the longitudinal direction of the foundation 8, and exhibits a proof strength that can withstand external forces such as a load and a shearing force acting on the foundation 8. The buttress 7 has upper and lower main muscles 7c and 7d. The column-side end of the main reinforcement 7c extends into the column 2 and is fixed to the concrete of the column 2, and the column-side end of the main reinforcement 7d penetrates the foundation 4 and extends into the pile 3, and the foundation 4 and the pile 3 Fix to concrete. The outer ends of the main bars 7c and 7d extend into the foundation 8 and are fixed to the concrete of the foundation 8.

  In addition, the pillar 2 and the pile 3 have hoop muscles 2b and 3b, the foundation 8 has scallop muscles 8b, and the buttress 7 has vertical and horizontal wall muscles 7e. Further, general-purpose deformed bars of about D19 to D29 are used as the main bars 2a, 3a, and 8a, and general-purpose deformed bars of about D13 to D19 are used as the hoop bars 2b and 3b, the wall bars 7e, and the stirrup bars 8b. be able to.

  As shown in FIG. 5, the foundation 4 has a main muscle 4a extending in the direction of the wall core and a scallop muscle 4b surrounding the main muscle 4b. As shown in FIGS. 5 and 6, the lower ends of the vertical bars 6 a of the wall body 6 are fixed to the concrete of the foundation 4. The vertical bars 6a are arranged at the joints and hollow parts of the PC block 5. The horizontal streaks 6b are arranged on each stage of the PC block 5, and the joint portions and the hollow portions are filled with cement mortar. Both end portions (not shown) of the horizontal stripe 6b are fixed to the concrete of the pillar 2. Thus, the integral wall body 6 that can withstand the earth pressure of the high ground G is formed. In addition, general-purpose deformed reinforcing bars of about D13 to D22 can be used as the vertical bars 6a and the horizontal bars 6b. In addition, the drain hole 9 (FIG. 6) is arrange | positioned in the appropriate place of the wall body 6 by the resin pipe | tube etc. FIG.

  10 and 11 are cross-sectional views of the retaining wall 1 showing modifications of the retaining wall 1.

  The configuration of the present invention is not limited to a straight retaining wall, but various planar forms such as a curved retaining wall (FIG. 10) or a retaining wall bent at an angle (FIG. 11). Can be applied to the retaining wall. Since the circular vertical column form of the column 2 does not have a specific directionality, it is advantageous in applying the present invention to such a retaining wall.

  Next, the construction method of the retaining wall 1 will be described.

  In the construction of the retaining wall 1, the excavation range of the high ground G is limited to the extent that the pile 3, the foundation 4, the buttress 7 and the foundation 8 can be constructed. That is, in the construction of the retaining wall 1, unlike the conventional retaining wall construction method, it is not necessary to excavate the high ground G for the footing construction.

  First, excavate the high ground G to the minimum extent required to construct the pile 3, foundation 4, buttress 7 and foundation 8, rebar is placed in the pile hole of the pile 3, and concrete is placed in the pile hole. And cast a cast-in-place concrete pile (pile 3). The main bars 2 a and 7 d of the pillar 2 and the buttress 7 are at least partially constructed at the same time as the arrangement of the pile 3, and the main bars 2 a and 7 d are fixed to the concrete of the pile 3.

Next, reinforcement of the foundation 4 and concrete placement are performed, and the foundation 4 is constructed.
Thereafter, the reinforcement of the pillar 2, buttress 7 and foundation 8 and concrete placement are performed, and the pillar 2, buttress 7 and foundation 8 are constructed. The vertical bars 6a and the horizontal bars 6b of the wall body 6 are at least partially constructed when the foundation 4 and the column 2 are arranged, and the ends of the vertical bars 6a and the horizontal bars 6b are fixed to the concrete of the foundation 4 and the column 2. To do.

  Further, the wall 6 is constructed by arranging the vertical bars 6a and the horizontal bars 6b of the wall body 6, the masonry of the PC block 5, filling the joints and the hollow parts, and hardening the concrete and mortar of each part. The excavated soil is backfilled and the construction of the retaining wall 1 is completed.

  According to the retaining wall 1 having such a configuration, the load of the retaining wall 1 is transmitted to the ground by the pillars 2 and the piles 3 aligned vertically. Therefore, since the construction of large footings as in the prior art can be omitted, the excavation range can be limited, and the amount of excavated soil, waste soil and backfill soil can be reduced. The foundation 4 constitutes a horizontal shaft assembly member that interconnects the vertical shaft assembly members (the pillars 2 and the piles 3) to improve the rigidity of the retaining wall 1 as a whole, and to make the weight and load of the wall body 6 vertical. It transmits to a shaft assembly member (column 2 and pile 3). The buttress 7 not only improves the rigidity of the column 2 but also works to prevent the retaining wall 1 from falling due to the frictional force generated between the side surface of the buttress 7 and the ground. The base 8 interconnects the buttresses 7 to improve the rigidity of the buttresses themselves.

  The foundations 4 and 8 also integrate separated vertical shaft members (columns 2 and piles 3) to improve the rigidity of the entire retaining wall against earth pressure. The foundation 8 also applies a vertical load to the tip of the buttress 7, and the weight of the buttress 7 and the foundation 8 displaces the center of gravity of the retaining wall 1 to the non-falling side. Therefore, the falling of the retaining wall 1 due to earth pressure can be reliably prevented.

  The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the above-described embodiments, and various modifications or changes can be made within the scope of the present invention described in the claims. Is possible.

  For example, in the above embodiment, the retaining wall 1 includes the column 2 and the beam 3 having a circular cross section, but the cross section of the column 2 and the beam 3 may be designed in various forms such as a square, a polygon, or an ellipse. .

  In addition, when the retaining wall 1 can ensure the desired rigidity only by connecting the vertical shaft assembly members (columns 2 and piles 3) by the foundation 4, the foundations 8 are independent foundations at the front ends of the buttresses 8, respectively. You may construct as.

  Further, the form of the buttress 7 is not necessarily limited to a right triangle. For example, the lower end surface 7b may be curved, or the upper end surface 7a may be inclined.

  Moreover, in the said embodiment, although the cast-in-place concrete pile was employ | adopted as the pile 3, you may employ | adopt other types of piles, such as an existing RC pile, a PC pile, and a steel pile, as the pile 3.

  The present invention is applied to a retaining wall constructed on a cliff, a steep slope, a water channel or the like. Since the retaining wall of the present invention does not require the construction of a large footing, the workability of the retaining wall is greatly improved. Moreover, according to this invention, the vertical retaining wall perpendicular | vertical to the ground which was difficult to construct with the conventional retaining wall can be constructed. Furthermore, the present invention enables a retaining wall renovation work for constructing a retaining wall on an existing retaining wall.

It is a perspective view showing roughly the basic composition of the retaining wall of the present invention. It is a top view (FIG. 2A) which shows the whole structure of the retaining wall shown in FIG. 1, a beam prone figure (FIG. 2B), and a pile prone figure (FIG. 2C). It is a side view which shows each component of a retaining wall. It is sectional drawing in the II line | wire of FIG. It is sectional drawing in the II-II line of FIG. It is the cross-sectional view and front view which show the reinforcement of a wall and a pillar. It is a shaft group figure of a retaining wall, and the shaft group of the front part of a retaining wall is shown. It is the axis group figure of a retaining wall, and the axis group of the edge part of the retaining wall bent to the high ground side is shown. FIG. 9 is an axial view of the retaining wall, and shows an axial configuration of the end of the retaining wall located on the side opposite to the end shown in FIG. 8. It is a cross-sectional view which shows the modification of a retaining wall. It is a cross-sectional view showing another modified example of the retaining wall.

Explanation of symbols

1 Retaining wall 2 Pillar 3 Pile 4 Foundation (first foundation)
5 PC block 6 Wall 7 Buttress 8 Foundation (second foundation)
G High ground L Low ground

Claims (4)

  1. In retaining wall which supports earth pressure of high ground by pillar, pile and wall body and prevents collapse of high ground,
    The column is composed of a reinforced concrete structure standing column constructed immediately above the pile, and the pile and the column constitute a vertical axis member aligned vertically,
    A reinforced concrete buttress made of inverted triangular wall is integrated with the back of the vertical shaft member,
    The adjacent vertical shaft members are integrally interconnected by a first foundation of a reinforced concrete structure that supports the vertical load of the wall, and the foundation is a continuous beam-shaped rectangular section with a main bar and a stirrup bar. A horizontal axis member having a beam form and interconnecting the vertical axis members;
    The second base of the reinforced concrete structure that integrally interconnects the front ends of the adjacent buttresses is integrally constructed at the front end of the buttress, and the second foundation is a beam in which the main reinforcement and the stirrup reinforcement are arranged. It has a continuous beam shape with a square-shaped cross section,
    The spaced apart vertical shaft members are integrally connected by first and second foundations arranged in parallel along the wall core, and the vertical shaft members, the first foundation, the buttress and the second foundation are integrally formed. A retaining wall characterized by forming a rigid frame having a square shape in plan view .
  2.   2. The retaining wall according to claim 1, wherein cross sections of the columns and the piles have the same shape or a similar shape, and center axes of the columns and the piles coincide with each other.
  3. In the construction method of the retaining wall that supports the earth pressure of the high ground by pillars, piles and walls, and prevents the collapse of the high ground,
    After the piles are constructed along the wall core of the retaining wall, a column of reinforced concrete structure is formed immediately above each pile to form vertical axis members, and adjacent vertical axis members are integrated with each other. Constructing the first foundation of the reinforced concrete structure that is connected and the main bar and stirrup bar are arranged in the form of a continuous beam with a beam-shaped square section, and constructing a horizontal frame member of the retaining wall,
    A buttress with a reinforced concrete structure that extends from the back of the column to the back of the retaining wall and consists of an inverted triangular wall is constructed, and the tips of adjacent buttresses are interconnected together and the main and scalloped muscles are arranged. A second foundation of a reinforced concrete structure having a continuous beam shape with a straight beam-shaped cross section is integrally constructed at the tip of the buttress, and the spaced vertical shaft members are arranged in parallel along the wall core. Integrally connected by the first and second foundations, thereby forming an integral and planar rigid framework comprising the vertical shaft member, the first foundation, the buttress and the second foundation;
    A method for constructing a retaining wall, wherein the wall body is constructed on the first foundation.
  4.   The wall body of the PC block masonry structure in which the reinforcing bar is arranged in the joint portion and then cement mortar is filled in the joint portion is constructed on the foundation, and the wall body is integrated with the foundation and the column. The construction method according to claim 3.
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