JP2009293331A - Structure of retaining wall formed of soil improvement object and its construction method - Google Patents

Structure of retaining wall formed of soil improvement object and its construction method Download PDF

Info

Publication number
JP2009293331A
JP2009293331A JP2008150042A JP2008150042A JP2009293331A JP 2009293331 A JP2009293331 A JP 2009293331A JP 2008150042 A JP2008150042 A JP 2008150042A JP 2008150042 A JP2008150042 A JP 2008150042A JP 2009293331 A JP2009293331 A JP 2009293331A
Authority
JP
Japan
Prior art keywords
ground improvement
improvement body
retaining wall
ground
slope
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2008150042A
Other languages
Japanese (ja)
Other versions
JP5146117B2 (en
Inventor
Kinji Takeuchi
謹治 竹内
Haruyuki Yamamoto
春行 山本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to JP2008150042A priority Critical patent/JP5146117B2/en
Publication of JP2009293331A publication Critical patent/JP2009293331A/en
Application granted granted Critical
Publication of JP5146117B2 publication Critical patent/JP5146117B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
  • Retaining Walls (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure of a retaining wall formed of a soil improvement object capable of facilitating a construction operation by eliminating the problems of the concrete retaining wall. <P>SOLUTION: This retaining wall formed of a soil improvement object comprises: a bottom ground improvement object 1 formed by soil-improving the dug section of a foundation ground B; a retaining wall section soil improvement object 2 which is formed by soil-improving the bank on the bottom ground improvement object 1 and which has a plurality of vertical soil improvement objects 2A, 2B, ..., 2E stacked in order in such a manner that a slope S is continuously formed; a water permeable layer 3 which is formed by digging the bank on the rear sides of the ground improvement objects 2A, 2B, ..., 2E and placing a back filler 4 therein and which is brought into contact with the rear surface of the retaining wall section soil improvement object 2 and extends in the vertical direction; a drain pipe 5 which extends from the water permeable layer 3 to the slope S of the retaining wall section ground improvement object 2 and which drains the water on the rear side of the retaining wall section soil improvement object 2 to the front side; and a protective member for protecting the slope S and the upper surface C of the retaining wall section soil improvement object 2 and the upper surface D of the water permeable layer 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、土留め用の擁壁の構造及びその施工方法に関わり、更に詳しくは、コンクリート製擁壁を代替する地盤改良体からなる擁壁の構造及びその施工方法に関するものである。   The present invention relates to a structure of a retaining wall for earth retaining and a construction method thereof, and more particularly to a structure of a retaining wall made of a ground improvement body replacing a concrete retaining wall and a construction method thereof.

法面の崩壊を防ぐ土留め擁壁としてコンクリート製擁壁が広く用いられており、重力式コンクリート擁壁として、施工現場に組んだ型枠内に鉄筋を配設し、コンクリートを打設して構築するもの(以下において「現場打ちコンクリート方式」という。)、及び、施工現場の上下左右にプレキャストコンクリートブロックを積み上げ、これらブロックの上下に連通する空隙部に鉄筋を配設し、前記空隙部にコンクリートを充填して構築するもの(以下において「プレキャストコンクリートブロック積み上げ方式」という。例えば、特許文献1参照。)、L型コンクリート擁壁として、竪壁及び底板からなるプレキャスト成形品である鉄筋コンクリート製擁壁ブロックを、そのまま施工現場に並設するもの(以下において「L型コンクリートブロック並設方式」という。例えば、特許文献2参照。)等がある。   Concrete retaining walls are widely used as retaining retaining walls to prevent the slope from collapsing, and as gravity concrete retaining walls, reinforcing bars are placed in the formwork assembled at the construction site, and concrete is placed. Precast concrete blocks are stacked on the construction site (hereinafter referred to as “on-site concrete method”) and on the top, bottom, left and right of the construction site, and reinforcing bars are disposed in the gaps communicating with the top and bottom of these blocks. Concrete construction (hereinafter referred to as “precast concrete block stacking method”; see, for example, Patent Document 1), L-shaped concrete retaining wall made of reinforced concrete, which is a precast molded product consisting of a wall and a bottom plate Wall blocks that are installed side by side on the construction site (“L-shaped concrete block” Click parallel 設方 formula "hereinafter. For example, refer to Patent Document 2.), And the like.

特開2005−98093号公報(図1)Japanese Patent Laying-Open No. 2005-98093 (FIG. 1) 登録実用新案第3022072号公報(図1、図6)Registered Utility Model No. 3022072 (FIGS. 1 and 6)

現場打ちコンクリート方式では、型枠の組立作業、型枠内に鉄筋を配設する作業及び生コンクリート固化後における型枠の解体作業が必要であり、作業が繁雑であることから工期が長くなるとともに、型枠工等の技能工が必要になる。
また、プレキャストコンクリートブロック積み上げ方式では、ブロックの形状が大きい場合には施工時にブロックを吊り上げる重機が必要になり、ブロックの形状が小さい場合には1個ずつブロックを積み上げる作業に時間がかかり、ブロックの形状が大きい場合及び小さい場合のいずれにおいても、上下左右に積み上げたブロックの上下に連通する空隙部に鉄筋を配設してコンクリートを充填する現場作業が必要になる。
さらに、L型コンクリートブロック並設方式では、擁壁ブロックの形状及び重量が大きいため施工現場への運搬及び施工時にブロックを吊り上げる大型の重機が必要になるとともに、隣接する擁壁ブロックを連結固定する連結金具等が必要になる。
以上のように、コンクリート製擁壁では、施工に時間がかかるとともに施工コストが増大するという問題がある。
The cast-in-place concrete method requires assembly work for the formwork, work for placing the reinforcing bars in the formwork, and work for dismantling the formwork after the ready-mixed concrete is solidified. Skilled workers such as formwork are required.
In addition, in the precast concrete block stacking method, if the block shape is large, heavy equipment is required to lift the block during construction. If the block shape is small, it takes time to stack the blocks one by one. In both cases where the shape is large and small, it is necessary to perform on-site work in which reinforcing bars are disposed in the gaps communicating with the upper and lower blocks stacked vertically and horizontally and filled with concrete.
Furthermore, in the L-type concrete block side-by-side system, the shape and weight of the retaining wall block is large, so a large heavy machine that lifts the block during transportation and construction is required, and adjacent retaining wall blocks are connected and fixed. Connecting hardware is required.
As described above, the concrete retaining wall has problems that it takes time to construct and the construction cost increases.

そこで本発明が前述の状況に鑑み、解決しようとするところは、上述のコンクリート製擁壁の問題点を解消して施工作業を容易化することができる、地盤改良体からなる擁壁の構造及びその施工方法を提供する点にある。   Therefore, in view of the above-mentioned situation, the present invention intends to solve the problem of the above-mentioned concrete retaining wall, and the structure of the retaining wall made of the ground improvement body that can facilitate the construction work and The point is to provide the construction method.

本発明に係る地盤改良体からなる擁壁の構造は、前記課題解決のために、基礎地盤の掘下げ部を地盤改良して形成された底部地盤改良体と、該底部地盤改良体上の盛土を地盤改良して形成され、法面が連続するように順次積み重ねられた上下複数の地盤改良体からなる擁壁部地盤改良体と、前記上下複数の地盤改良体の背面側の盛土を掘り下げて裏込め材を充填して形成された、前記擁壁部地盤改良体の背面に接して上下方向に延びる透水層と、該透水層から前記擁壁部地盤改良体の法面まで延び、前記擁壁部地盤改良体の背面側の水を正面側へ排水する排水管と、前記擁壁部地盤改良体の法面及び上面並びに前記透水層の上面を保護する保護部材とからなるものである。   In order to solve the above problems, the retaining wall structure comprising the ground improvement body according to the present invention comprises a bottom ground improvement body formed by ground improvement of a dug portion of the foundation ground, and a fill on the bottom ground improvement body. A retaining wall part ground improvement body composed of a plurality of upper and lower ground improvement bodies, which are formed by improving the ground and sequentially stacked so that the slope is continuous, and the backside embankment of the plurality of upper and lower ground improvement bodies are dug down. A water permeable layer formed by filling a filling material and extending in a vertical direction in contact with a back surface of the retaining wall portion ground improvement body, and extending from the water permeable layer to a slope of the retaining wall portion ground improvement body, and the retaining wall The drainage pipe which drains the water of the back side of a partial ground improvement body to the front side, and the protection member which protects the slope and upper surface of the said retaining wall part ground improvement body, and the upper surface of the said water permeable layer.

ここで、前記底部地盤改良体及び擁壁部地盤改良体の上下の地盤改良体間の接合面に凹凸係合部を形成又は前記接合面の上下に渡るダボを配設してなると好ましい。   Here, it is preferable that an uneven engagement portion is formed on the joint surface between the upper and lower ground improvement bodies of the bottom ground improvement body and the retaining wall ground improvement body, or a dowel extending over the joint surface is disposed.

また、前記底部地盤改良体及び擁壁部地盤改良体の上下の地盤改良体間の接合面を前上がり傾斜面としてなると好ましい。   Moreover, it is preferable when the joint surface between the upper and lower ground improvement bodies of the bottom ground improvement body and the retaining wall ground improvement body is a front rising slope.

さらに、前記擁壁部地盤改良体を、その法面を形成する前壁状地盤改良体及び該前壁状地盤改良体の背面から後方へ延びる、複数の垂直壁状地盤改良体からなる、平面視略櫛の歯状としてなると好ましい。   Further, the retaining wall portion ground improvement body is a plane composed of a front wall-like ground improvement body forming a slope and a plurality of vertical wall-like ground improvement bodies extending rearward from the back surface of the front wall-like ground improvement body. It is preferable to have a substantially comb tooth shape.

本発明に係る地盤改良体からなる擁壁の施工方法は、前記課題解決のために、基礎地盤の表層部を掘り下げ、該掘下げにより取った土に固化材を添加混合して埋め戻して敷き均し、締め固めることにより、底部地盤改良体を形成する工程と、後側地盤の法面から所望の擁壁法面にわたって前方へ延びる段状の盛土を行う工程、該段状の盛土を下位地盤改良体の上面まで掘り下げる工程、該掘下げにより取った土に固化材を添加混合して埋め戻して敷き均し、締め固めるとともに、法勾配を整形することにより上位地盤改良体を形成する工程、該上位地盤改良体の形成前又は形成途中において、その法面から背面まで延びる排水管を布設する工程、及び、前記上位地盤改良体の背面側の盛土を掘り下げて裏込め材を充填する工程、を繰り返して、法面が連続するように順次積み重ねられた上下複数の地盤改良体からなる擁壁部地盤改良体、該擁壁部地盤改良体の背面に接して上下方向に延びる透水層及び前記擁壁部地盤改良体の背面側の水を正面側へ排水する排水管を、前記底部地盤改良体上に構築する工程と、前記擁壁部地盤改良体の法面及び上面並びに前記透水層の上面の保護工を行う工程とからなるものである。   In order to solve the above problems, the method of constructing a retaining wall comprising a ground improvement body according to the present invention digs up the surface layer portion of the foundation ground, adds and mixes the solidified material into the soil taken by the digging, backfills and lays the floor. And forming a bottom ground improvement body by compacting, a step of performing stepped banking extending forward from a slope of the rear side ground to a desired retaining wall slope, and the stepped banking on the lower ground A step of digging up to the upper surface of the improved body, a step of adding and mixing the solidified material to the soil taken by the digging, backfilling and leveling, compacting, and forming an upper ground improvement body by shaping the legal gradient, Before or during the formation of the upper ground improvement body, a step of laying a drain pipe extending from the slope to the back surface, and a step of digging the backside embankment of the upper ground improvement body and filling a backfill material. repeat Retaining wall part ground improvement body consisting of a plurality of upper and lower ground improvement bodies stacked sequentially so that slopes are continuous, a water permeable layer extending in the vertical direction in contact with the back surface of the retaining wall part ground improvement body, and the retaining wall part ground A step of constructing a drain pipe for draining water on the rear side of the improved body to the front side on the bottom ground improved body, and a protective work for the slope and upper surface of the retaining wall ground improved body and the upper surface of the water permeable layer The process of performing.

本発明に係る地盤改良体からなる擁壁の構造は、基礎地盤の掘下げ部を地盤改良して形成された底部地盤改良体と、該底部地盤改良体上の盛土を地盤改良して形成され、法面が連続するように順次積み重ねられた上下複数の地盤改良体からなる擁壁部地盤改良体と、前記上下複数の地盤改良体の背面側の盛土を掘り下げて裏込め材を充填して形成された、前記擁壁部地盤改良体の背面に接して上下方向に延びる透水層と、該透水層から前記擁壁部地盤改良体の法面まで延び、前記擁壁部地盤改良体の背面側の水を正面側へ排水する排水管と、前記擁壁部地盤改良体の法面及び上面並びに前記透水層の上面を保護する保護部材とからなるので、地盤改良により形成された底部地盤改良体により地盤改良により形成された擁壁部地盤改良体を支持し、該擁壁部地盤改良体により土圧を受ける構成であることから、現場打ちコンクリート方式のような型枠の組立作業及び解体作業等が不要になるため、作業を簡素化することができるとともに、型枠工等の技能工が不要になる。
その上、プレキャストコンクリートブロック積み上げ方式のようなブロックを吊り上げる重機が不要になるとともに、上下左右に積み上げたブロックの上下に連通する空隙内への配筋及びコンクリートの充填作業が不要になる。
その上さらに、L型コンクリートブロック並設方式のようなブロックを吊り上げる大型の重機が不要になるとともに、隣接する擁壁ブロックを連結固定する連結金具も不要になる。
よって、擁壁を構築する工期を短縮することができるとともに、施工コストを低減することができる。
The structure of the retaining wall comprising the ground improvement body according to the present invention is formed by improving the ground on the bottom ground improvement body formed by improving the ground of the dug-down portion of the foundation ground, and the embankment on the bottom ground improvement body, Retaining wall part ground improvement body consisting of a plurality of upper and lower ground improvement bodies stacked sequentially so that the slopes are continuous, and filled with backfill material by digging the backside embankment of the plurality of upper and lower ground improvement bodies A permeable layer extending vertically in contact with the back surface of the retaining wall portion ground improvement body, and extending from the permeable layer to the slope of the retaining wall portion ground improvement body, and on the back side of the retaining wall portion ground improvement body A drainage pipe for draining the water of the water to the front side, and a protective member for protecting the slope and upper surface of the retaining wall portion ground improvement body and the upper surface of the water permeable layer, so that the bottom ground improvement body formed by ground improvement Supports the retaining wall part ground improvement body formed by ground improvement by In addition, since it is configured to receive earth pressure by the retaining wall portion ground improvement body, it is not necessary to perform assembly work and dismantling work of the formwork as in the on-site concrete method, so that the work can be simplified. Skilled workers such as formwork are not required.
In addition, a heavy machine for lifting the blocks as in the precast concrete block stacking method is not necessary, and it is not necessary to arrange the bars in the gaps communicating with the top and bottom of the blocks stacked vertically and horizontally and to fill the concrete.
In addition, a large heavy machine for lifting the blocks as in the L-shaped concrete block side-by-side system is not required, and a connecting bracket for connecting and fixing adjacent retaining wall blocks is not required.
Therefore, the construction period for constructing the retaining wall can be shortened and the construction cost can be reduced.

また、前記底部地盤改良体及び擁壁部地盤改良体の上下の地盤改良体間の接合面に凹凸係合部を形成又は前記接合面の上下に渡るダボを配設してなると、前記効果に加え、上下の地盤改良体間のずれをより効果的に抑制することができるため、土圧の変動等があっても、長期間にわたって擁壁の形状を安定して保持することができる。   In addition, when the concave and convex engaging portions are formed on the joint surface between the upper and lower ground improvement bodies of the bottom ground improvement body and the retaining wall ground improvement body, or dowels extending above and below the joint surface are disposed, the above effect is achieved. In addition, since the displacement between the upper and lower ground improvement bodies can be more effectively suppressed, the shape of the retaining wall can be stably maintained over a long period of time even if there is a change in earth pressure or the like.

さらに、前記底部地盤改良体及び擁壁部地盤改良体の上下の地盤改良体間の接合面を前上がり傾斜面としてなると、前記効果に加え、上側の地盤改良体がその重力により前上がり傾斜面に沿って背面側へ移動する方向の分力が作用し、したがってより大きな土圧に対抗することができることから、地盤改良体の前後方向の長さを小さくすることができるため、地盤改良を行う範囲を小さくすることができる。
よって、盛土の掘削範囲及び地盤改良体の量を削減することができるため、さらに工期の短縮及び施工コストの削減を図ることができる。
Furthermore, when the joint surface between the upper and lower ground improvement bodies of the bottom ground improvement body and the retaining wall ground improvement body is a front rising slope surface, in addition to the above effect, the upper ground improvement body is a front rising slope surface due to its gravity. Since the component force in the direction of moving to the back side along the surface acts, and therefore can resist a greater earth pressure, the length of the ground improvement body in the front-rear direction can be reduced, so the ground improvement is performed. The range can be reduced.
Therefore, since the excavation range of the embankment and the amount of ground improvement body can be reduced, the construction period can be further shortened and the construction cost can be reduced.

さらにまた、前記擁壁部地盤改良体を、その法面を形成する前壁状地盤改良体及び該前壁状地盤改良体の背面から後方へ延びる、複数の垂直壁状地盤改良体からなる、平面視略櫛の歯状としてなると、前記効果に加え、前壁状地盤改良体の背面から後方へ延びる垂直壁状地盤改良体が擁壁の前方への倒れを抑制するとともに、擁壁部地盤改良体の強度と剛性も増加することから、平面視略櫛の歯状の地盤改良体として地盤改良体全体の体積を小さくすることができるため、地盤改良を行う範囲を小さくすることができる。
よって、盛土の掘削範囲及び地盤改良体の量を削減することができるため、さらに工期の短縮及び施工コストの削減を図ることができる。
Furthermore, the retaining wall portion ground improvement body is composed of a front wall-like ground improvement body forming a slope and a plurality of vertical wall-like ground improvement bodies extending rearward from the back surface of the front wall-like ground improvement body. When viewed as a substantially comb tooth in plan view, in addition to the above effects, the vertical wall-shaped ground improvement body extending rearward from the back surface of the front wall-shaped ground improvement body prevents the retaining wall from falling forward, and the retaining wall portion ground Since the strength and rigidity of the improved body are also increased, the volume of the entire ground improvement body can be reduced as a tooth-like ground improvement body having a substantially comb shape in a plan view, and therefore the range of ground improvement can be reduced.
Therefore, since the excavation range of the embankment and the amount of ground improvement body can be reduced, the construction period can be further shortened and the construction cost can be reduced.

本発明に係る地盤改良体からなる擁壁の施工方法は、基礎地盤の表層部を掘り下げ、該掘下げにより取った土に固化材を添加混合して埋め戻して敷き均し、締め固めることにより、底部地盤改良体を形成する工程と、後側地盤の法面から所望の擁壁法面にわたって前方へ延びる段状の盛土を行う工程、該段状の盛土を下位地盤改良体の上面まで掘り下げる工程、該掘下げにより取った土に固化材を添加混合して埋め戻して敷き均し、締め固めるとともに、法勾配を整形することにより上位地盤改良体を形成する工程、該上位地盤改良体の形成前又は形成途中において、その法面から背面まで延びる排水管を布設する工程、及び、前記上位地盤改良体の背面側の盛土を掘り下げて裏込め材を充填する工程、を繰り返して、法面が連続するように順次積み重ねられた上下複数の地盤改良体からなる擁壁部地盤改良体、該擁壁部地盤改良体の背面に接して上下方向に延びる透水層及び前記擁壁部地盤改良体の背面側の水を正面側へ排水する排水管を、前記底部地盤改良体上に構築する工程と、前記擁壁部地盤改良体の法面及び上面並びに前記透水層の上面の保護工を行う工程とからなるので、現場打ちコンクリート方式のような型枠を組み立てる工程、型枠内に鉄筋を配設する工程及び生コンクリート固化後における型枠を解体する工程が不要になる。   The method of constructing the retaining wall comprising the ground improvement body according to the present invention is to dig down the surface layer portion of the foundation ground, add and solidify the solidified material to the soil taken by the digging down, lay and spread, and compact, A step of forming a bottom ground improvement body, a step of performing stepped banking extending forward from the slope of the rear side ground to a desired retaining wall slope, and a step of digging the staged banking to the upper surface of the lower ground improvement body , A step of forming a higher ground improvement body by adding a solidifying material to the soil taken by the dug, mixing, backfilling, leveling, compacting, and shaping the normal gradient, before the formation of the upper ground improvement body Or, in the middle of formation, repeating the process of laying a drain pipe extending from the slope to the back and the process of digging the back side embankment of the upper ground improvement body and filling the backfill material, the slope is continuous. Like Next, a retaining wall portion ground improvement body comprising a plurality of upper and lower ground improvement bodies stacked, a water permeable layer extending in a vertical direction in contact with the rear surface of the retaining wall portion ground improvement body, and water on the back side of the retaining wall portion ground improvement body A drainage pipe for draining the water to the front side, and a process for constructing the slope and upper surface of the retaining wall part ground improvement body and a protection work for the upper surface of the water permeable layer. The process of assembling the mold like the cast-in-place concrete method, the process of disposing the reinforcing bars in the mold, and the process of dismantling the mold after the ready-mixed concrete is eliminated.

その上、プレキャストコンクリートブロック積み上げ方式のような重機によりブロックを吊り上げる工程、並びに、上下左右に積み上げたブロックの上下に連通する空隙内へ配筋する工程及びコンクリートを充填する工程が不要になる。
その上さらに、L型コンクリートブロック並設方式のような大型の重機によりブロックを吊り上げる工程、及び、隣接する擁壁ブロックを連結金具により連結固定する固定が不要になる。
よって、擁壁の施工方法を簡素化することができるため、擁壁を構築する工期を短縮することができるとともに、施工コストを低減することができる。
In addition, the process of lifting the block by a heavy machine such as the precast concrete block stacking system, the process of arranging the bars in the gaps communicating with the upper and lower blocks, and the process of filling the concrete are unnecessary.
Furthermore, the process of lifting the block with a large heavy machine such as an L-shaped concrete block side-by-side system and the fixing for connecting and fixing adjacent retaining wall blocks with connecting metal fittings become unnecessary.
Therefore, since the construction method of the retaining wall can be simplified, the construction period for constructing the retaining wall can be shortened, and the construction cost can be reduced.

次に本発明の実施の形態を添付図面に基づき詳細に説明するが、本発明は、添付図面に示された形態に限定されず特許請求の範囲記載の要件を満たす実施形態の全てを含むものである。なお、本明細書においては、擁壁の背面側から正面側へ向かって(図中矢印F参照。)、前後左右をいうものとする。   Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments shown in the accompanying drawings, and includes all the embodiments that satisfy the requirements described in the claims. . In addition, in this specification, it shall refer to front and rear, right and left toward the front side from the back side of a retaining wall (refer arrow F in a figure).

実施の形態1.
図1は本発明の実施の形態1に係る地盤改良体からなる擁壁の構造を示す縦断側面図、図2は同じく正面図、図3は地盤改良体からなる擁壁の施工方法を示す縦断側面図であり、図3(a)は底部地盤改良体1上に段状の盛土8Aを行った状態を、図3(b)は排水管5Aを布設し、地盤改良体2Aを形成して裏込め材4を充填した上に段状の盛土8Bを行った状態を示している。
Embodiment 1 FIG.
1 is a longitudinal side view showing a structure of a retaining wall made of a ground improvement body according to Embodiment 1 of the present invention, FIG. 2 is a front view of the same, and FIG. 3 is a longitudinal section showing a method for constructing a retaining wall made of a ground improvement body. FIG. 3A is a side view, FIG. 3A shows a state where a stepped embankment 8A is performed on the bottom ground improvement body 1, and FIG. 3B shows a drainage pipe 5A laid to form a ground improvement body 2A. The state where the step-like embankment 8B was performed after filling the backfill material 4 is shown.

図1に示すように、本発明の実施の形態1に係る地盤改良体からなる擁壁は、原地盤Aに対して切土及び盛土を行って形成され、基礎地盤Bの掘下げ部を地盤改良して形成された底部地盤改良体1、底部地盤改良体1上の盛土を地盤改良して形成され、法面Sが連続するように順次積み重ねられた上下複数の地盤改良体2A,2B,…,2Eからなる擁壁部地盤改良体2、上下複数の地盤改良体2A,2B,…,2Eの背面側の盛土を掘り下げて、例えば砕石や砂利等からなる裏込め材4を充填して形成された、擁壁部地盤改良体2の背面に接して上下方向に延びる透水層3、透水層3から擁壁部地盤改良体2の法面Sまで延び、擁壁部地盤改良体2の背面側の水を正面側へ排水する排水管5、擁壁部地盤改良体2の法面S及び上面C並びに透水層3の上面Dを保護する、例えばモルタル若しくは客土の吹付け又は植生マット若しくは筵の張付け等である保護部材6からなる。
また、底部地盤改良体1は、略水平板状の下底部地盤改良体1A上に、前面を法面Sとした略水平板状の上底部地盤改良体1Bを積層しており、基礎地盤Bの略水平な地面から上底部地盤改良体1Bの上部が露出しているが、底部地盤改良体1はこのような上下の地盤改良体1B,1Aからなる構成に限定されるものではなく、さらに底部地盤改良体1の形状も図1に示す構成に限定されるものではない。
As shown in FIG. 1, the retaining wall made of the ground improvement body according to the first embodiment of the present invention is formed by cutting and banking the original ground A, and the ground improvement of the dug portion of the foundation ground B is performed. A plurality of upper and lower ground improvement bodies 2A, 2B, ... formed by improving the embankment on the bottom ground improvement body 1, the ground improvement on the bottom ground improvement body 1, and sequentially stacked so that the slope S is continuous. , 2E retaining wall part ground improvement body 2, and a plurality of upper and lower ground improvement bodies 2A, 2B,..., 2E are dug down and filled with a backfill material 4 made of crushed stone or gravel, for example. The permeable layer 3 extending in the vertical direction in contact with the rear surface of the retaining wall portion ground improvement body 2, extending from the permeable layer 3 to the slope S of the retaining wall portion ground improvement body 2, and the rear surface of the retaining wall portion ground improvement body 2 Drainage pipe 5 for draining the water on the front side, slope S and upper surface C of retaining wall part ground improvement body 2, and Protecting the upper surface D of the aqueous layer 3, a protective member 6 is, for example, mortar or spraying of soil dressing or vegetation mat or sticking, etc. of the straw mat.
Moreover, the bottom ground improvement body 1 has laminated | stacked the substantially horizontal plate-shaped upper bottom part ground improvement body 1B which made the front surface the slope S on the substantially horizontal plate-like lower bottom part ground improvement body 1A. Although the upper part of the upper bottom ground improvement body 1B is exposed from the substantially horizontal ground, the bottom ground improvement body 1 is not limited to such a configuration composed of the upper and lower ground improvement bodies 1B and 1A. The shape of the bottom ground improvement body 1 is not limited to the structure shown in FIG.

図1及び図2に示すように、排水管5は、上下方向及び左右方向に離間して配設されており、すなわち、底部地盤改良体1上の地盤改良体2Aの下部に、その左右方向に離間して配置された排水管5A,…、地盤改良体2A上の地盤改良体2Bの下部に、その左右方向に離間して配置された排水管5B,…、地盤改良体2B上の地盤改良体2Cの下部に、その左右方向に離間して配置された排水管5C,…、地盤改良体2C上の地盤改良体2Dの下部に、その左右方向に離間して配置された排水管5D,…、及び、地盤改良体2D上の地盤改良体2Eの下部に、その左右方向に離間して配置された排水管5E,…からなる。   As shown in FIG. 1 and FIG. 2, the drain pipe 5 is spaced apart in the up-down direction and the left-right direction, that is, in the left-right direction below the ground improvement body 2A on the bottom ground improvement body 1. The drainage pipes 5A,..., Spaced apart from each other, and the drainage pipes 5B,..., The ground on the ground improvement body 2B, spaced apart in the left-right direction below the ground improvement body 2B on the ground improvement body 2A. Drain pipes 5C arranged in the lower part of the improved body 2C, spaced apart in the left-right direction,... Drain pipes 5D arranged in the lower part of the ground improved body 2D on the ground improved body 2C, separated in the left-right direction. ,..., And drain pipes 5E,... Disposed below the ground improvement body 2E on the ground improvement body 2D and spaced apart in the left-right direction.

また、擁壁部地盤改良体2の上下の地盤改良体2E,2D間の接合面、上下の地盤改良体2D,2C間の接合面、上下の地盤改良体2C,2B間の接合面、上下の地盤改良体2B,2A間の接合面には、それぞれ、下側の地盤改良体の後部左右に形成された凹部7A,…に上側の地盤改良体の後部左右に形成された凸部7B,…が係合する、凹凸係合部7,…が形成されていることから、上下の地盤改良体間のずれをより効果的に抑制することができるため、土圧の変動等があっても、長期間にわたって擁壁の形状を安定して保持することができる。   Moreover, the joint surface between the upper and lower ground improvement bodies 2E and 2D of the retaining wall portion ground improvement body 2, the joint surface between the upper and lower ground improvement bodies 2D and 2C, the joint surface between the upper and lower ground improvement bodies 2C and 2B, On the joint surface between the ground improvement bodies 2B and 2A, the concave portions 7A formed on the left and right sides of the lower ground improvement body, respectively, and the convex portions 7B formed on the left and right sides of the upper ground improvement body, respectively. Since the concavo-convex engaging portions 7, ... are formed, the displacement between the upper and lower ground improvement bodies can be more effectively suppressed, so even if there is a fluctuation in earth pressure, etc. The shape of the retaining wall can be stably maintained over a long period of time.

ここで、凹凸係合部7,…に代えて、上下の地盤改良体間の接合面の上下に渡るダボを配設するようにしてもよく、このようなダボを配設する構成の方がその施工が簡素化される。
また、底部地盤改良体1とその上側の地盤改良体2Aとの接合面に凹凸係合部を形成してもよいし、あるいは、底部地盤改良体1と地盤改良体2Aとの接合面にその上下に渡るダボを配設してもよい。
なお、上下の地盤改良体間の接合面には摩擦力が作用してずれが抑制されるため、上記凹凸係合部7,…又はダボは必須の構成ではなく、擁壁を構築する場所によっては凹凸係合部7,…又はダボを無くすことができ、このような構成によれば、施工がさらに簡素化される。
Here, instead of the concave and convex engaging portions 7,..., Dowels that extend above and below the joint surface between the upper and lower ground improvement bodies may be disposed, and the configuration in which such dowels are disposed is better. Its construction is simplified.
Further, an uneven engagement portion may be formed on the joint surface between the bottom ground improvement body 1 and the ground improvement body 2A on the upper side, or the joint surface between the bottom ground improvement body 1 and the ground improvement body 2A. A dowel that extends vertically may be provided.
In addition, since a frictional force acts on the joint surface between the upper and lower ground improvement bodies and the displacement is suppressed, the uneven engagement portion 7,... Or the dowel is not an essential configuration, but depends on the place where the retaining wall is constructed. Can eliminate the concave and convex engaging portions 7,... Or the dowels, and according to such a configuration, the construction is further simplified.

次に、図1〜図3を参照して、地盤改良体からなる擁壁の施工方法の詳細について説明する。
基礎地盤Bの表層部を所定形状にバックホウによる鋤取り等により掘り下げ、該掘下げにより取った土に、例えば二酸化けい素、酸化アルミニウム、酸化カルシウム及び三酸化イオウ等の成分からなるセメント系固化材等の固化材を添加混合して埋め戻して敷き均し、重機及びローラー等により締め固めることにより、例えば高さが1m程度の下底部地盤改良体1Aを形成する。
次に、例えば日を改めて(一定の時間をおいて)下底部地盤改良体1Aを硬化させた後、該下底部地盤改良体1A上に、前記掘下げにより取った土に固化材を添加混合して埋め戻して敷き均し、締め固めることにより、例えば高さが1m程度の上底部地盤改良体1Bを形成する。
Next, with reference to FIGS. 1-3, the detail of the construction method of the retaining wall which consists of a ground improvement body is demonstrated.
The surface layer part of the foundation ground B is dug into a predetermined shape by dredging with a backhoe, etc., and the cement-based solidified material composed of components such as silicon dioxide, aluminum oxide, calcium oxide and sulfur trioxide in the soil taken by the dug By adding, mixing, backfilling and leveling and solidifying with a heavy machine and a roller, for example, a lower ground improvement body 1A having a height of about 1 m is formed.
Next, for example, after changing the date (after a certain time) to harden the lower bottom ground improvement body 1A, the solidified material is added and mixed to the soil taken by the dug down on the lower bottom ground improvement body 1A. For example, an upper bottom ground improvement body 1B having a height of about 1 m is formed by backfilling, leveling and compacting.

次に、例えば日を改めて(一定の時間をおいて)上底部地盤改良体1Bを硬化させた後、該上底部地盤改良体1B上に、図3(a)に示すように、後側地盤の法面SBから所望の擁壁法面Sにわたって前方へ延びる、例えば高さが1m程度の段状の盛土8Aを行い、該段状の盛土8Aを上底部地盤改良体1Bの上面まで掘り下げ、排水管5A,…を布設した後、前記掘下げにより取った土に固化材を添加混合して埋め戻して敷き均し、締め固めるとともに、例えば土羽打ち等により法勾配を整形することにより地盤改良体2Aを形成する。
そして、地盤改良体2Aの背面側の盛土8Aを掘り下げて裏込め材4を充填する。
なお、排水管5A,…は、地盤改良体2Aの形成前ではなく、その形成途中において、地盤改良体2Aの高さ方向の中間位置に布設してもよい。
Next, for example, after changing the date (after a certain time) to harden the upper bottom ground improvement body 1B, on the upper bottom ground improvement body 1B, as shown in FIG. Extending from the slope SB to the desired retaining wall slope S forward, for example, a stepped bank 8A having a height of about 1 m, and digging the stepped bank 8A to the upper surface of the upper bottom ground improvement body 1B, After laying the drain pipes 5A, ..., adding the solidification material to the soil taken by the dug down, backfilling, leveling, compacting, and improving the ground by shaping the legal gradient by, for example, sanding Form body 2A.
Then, the backfill material 4 is filled by digging up the back embankment 8A of the ground improvement body 2A.
Note that the drain pipes 5A,... May be laid at an intermediate position in the height direction of the ground improvement body 2A during the formation thereof, not before the formation of the ground improvement body 2A.

次に、例えば日を改めて(一定の時間をおいて)地盤改良体2Aを硬化させた後、該地盤改良体2A上に、図3(b)に示すように、後側地盤の法面SBから所望の擁壁法面Sにわたって前方へ延びる、例えば高さが1m程度の段状の盛土8Bを行い、上述の工程と同様の作業を行う。
すなわち、段状の盛土8Bを地盤改良体2A上面まで掘り下げ、排水管5B,…を布設した後、前記掘下げにより取った土に固化材を添加混合して埋め戻して敷き均し、締め固めるとともに、法勾配を整形することにより地盤改良体2Bを形成し、その背面側の盛土8Bを掘り下げて裏込め材4を充填する。
Next, for example, after the ground improvement body 2A is hardened by changing the date (after a certain period of time), the slope SB of the rear side ground is formed on the ground improvement body 2A as shown in FIG. A step-like embankment 8B having a height of about 1 m, for example, extending forward from a desired retaining wall slope S to the front is performed, and the same operation as that described above is performed.
That is, after digging the stepped embankment 8B to the upper surface of the ground improvement body 2A, laying the drainage pipes 5B,... Then, the ground improvement body 2B is formed by shaping the normal gradient, and the backfill material 4 is filled by digging up the embankment 8B on the back side.

以上のような後側地盤の法面SBから所望の擁壁法面Sにわたって前方へ延びる段状の盛土8A,8B,…を行う工程、段状の盛土8A,8B,…を下位地盤改良体1,2A,…の上面まで掘り下げる工程、掘下げにより取った土に固化材を添加混合して埋め戻して敷き均し、締め固めるとともに、法勾配を整形することにより上位地盤改良体2A,2B,…を形成する工程、上位地盤改良体2A,2B,…の形成前又は形成途中において、その法面Sから背面まで延びる排水管5A,…,5B,…を布設する工程、及び、上位地盤改良体2A,2B,…の背面側の盛土8A,8B,…を掘り下げて裏込め材4を充填する工程、を繰り返して、図1に示すように、法面Sが連続するように順次積み重ねられた上下複数の地盤改良体2A,2B,…からなる擁壁部地盤改良体2、擁壁部地盤改良体2の背面に接して上下方向に延びる透水層3及び擁壁部地盤改良体2の背面側の水を正面側へ排水する排水管5を底部地盤改良体1上に構築する。   The step of performing stepped banking 8A, 8B,... Extending forward from the slope SB of the rear side ground to the desired retaining wall surface S, and the stepped banking 8A, 8B,. The process of digging up to the upper surface of 1, 2A, ..., adding and mixing the solidified material to the soil taken by digging, backfilling, leveling, compacting, and shaping the legal gradient, the upper ground improvement body 2A, 2B, ..., the process of laying drain pipes 5A, ..., 5B, ... extending from the slope S to the back before or during the formation of the upper ground improvement bodies 2A, 2B, ..., and the upper ground improvement The process of digging down the embankment 8A, 8B,... On the back side of the bodies 2A, 2B,. Multiple ground improvement bodies 2A and 2B Drain which drains the water on the back side of the retaining wall part ground improvement body 2, the water permeable layer 3 extending in the vertical direction in contact with the back surface of the retaining wall part ground improvement body 2 and the back side of the retaining wall part ground improvement body 2 to the front side The pipe 5 is constructed on the bottom ground improvement body 1.

次に、図1に示すように、擁壁部地盤改良体2の法面S及び上面C並びに透水層3の上面Dの保護工を行う。すなわち、擁壁部地盤改良体2の法面S及び上面C並びに透水層3の上面Dに、例えばモルタル若しくは客土の吹付け又は植生マット若しくは筵の張付け等を行う。   Next, as shown in FIG. 1, the slope S and the upper surface C of the retaining wall portion ground improvement body 2 and the upper surface D of the water permeable layer 3 are protected. That is, for example, mortar or soil is sprayed or a vegetation mat or cocoon is applied to the slope S and the upper surface C of the retaining wall portion ground improvement body 2 and the upper surface D of the water permeable layer 3.

以上のような地盤改良体からなる擁壁の施工方法によれば、現場打ちコンクリート方式のような型枠を組み立てる工程、型枠内に鉄筋を配設する工程及び生コンクリート固化後における型枠を解体する工程が不要になる。
また、プレキャストコンクリートブロック積み上げ方式のような重機によりブロックを吊り上げる工程、並びに、上下左右に積み上げたブロックの上下に連通する空隙内へ配筋する工程及びコンクリートを充填する工程が不要になる。
さらに、L型コンクリートブロック並設方式のような大型の重機によりブロックを吊り上げる工程、及び、隣接する擁壁ブロックを連結金具により連結固定する固定が不要になる。
よって、擁壁の施工方法を簡素化することができるため、擁壁を構築する工期を短縮することができるとともに、施工コストを低減することができる。
According to the construction method of the retaining wall made of the ground improvement body as described above, the process of assembling the formwork like the cast-in-place concrete method, the process of arranging the reinforcing bars in the formwork, and the formwork after the ready-mixed concrete is solidified The process of dismantling becomes unnecessary.
Moreover, the process of lifting the block by a heavy machine such as the precast concrete block stacking system, the process of arranging the bars in the gaps communicating with the top and bottom of the blocks stacked vertically, and the process of filling the concrete are not required.
Further, the process of lifting the block by a large heavy machine such as an L-shaped concrete block side-by-side system and the fixing for connecting and fixing the adjacent retaining wall blocks by the connecting metal fitting are not required.
Therefore, since the construction method of the retaining wall can be simplified, the construction period for constructing the retaining wall can be shortened, and the construction cost can be reduced.

実施の形態2.
図4は本発明の実施の形態2に係る地盤改良体からなる擁壁の構造を示す縦断側面図、図5は図4の矢視X−X断面図であり、実施の形態1の図1〜図3と同一符号は同一又は相当部分を示している。実施の形態2に係る地盤改良体からなる擁壁は、実施の形態1と同様の方法により施工される。
Embodiment 2. FIG.
4 is a longitudinal side view showing a structure of a retaining wall made of a ground improvement body according to Embodiment 2 of the present invention, and FIG. 5 is a sectional view taken along the line XX of FIG. The same reference numerals as in FIG. 3 indicate the same or corresponding parts. The retaining wall made of the ground improvement body according to the second embodiment is constructed by the same method as in the first embodiment.

実施の形態2において、上下複数の地盤改良体2A,2B,…,2Eは、同様の形状であり、図5に示すように、擁壁部地盤改良体2の法面Sを形成する前壁状地盤改良体9、及び、前壁状地盤改良体9の背面から後方へ延びる、左右方向に離間する複数の垂直壁状地盤改良体10,…からなり、平面視略櫛の歯状であるため、左右に隣り合う垂直壁状地盤改良体10,10の間の平面視略コ字状部内には盛土8Cが残っている。
また、排水管5は、垂直壁状地盤改良体10,…がある箇所に、擁壁部地盤改良体2の法面Sから垂直壁状地盤改良体10,…の背面に接する透水層3まで届くように布設される。
ここで、前壁状地盤改良体9の前面から垂直壁状地盤改良体10の後面までの前後方向長さである擁壁部地盤改良体2の奥行きEと擁壁部地盤改良体2の高さHとの比(E/H)は、0.3〜0.4程度である。
In the second embodiment, the plurality of upper and lower ground improvement bodies 2A, 2B,..., 2E have the same shape, and the front wall forming the slope S of the retaining wall portion ground improvement body 2 as shown in FIG. And a plurality of vertical wall-shaped ground improvement bodies 10 that extend rearward from the back surface of the front wall-shaped ground improvement body 9 and that are separated in the left-right direction, and have a substantially comb-like shape in plan view. Therefore, the embankment 8 </ b> C remains in the substantially U-shaped portion in plan view between the vertical wall-like ground improvement bodies 10, 10 adjacent to the left and right.
In addition, the drain pipe 5 extends from the slope S of the retaining wall portion ground improvement body 2 to the water permeable layer 3 in contact with the back surface of the vertical wall ground improvement body 10, where the vertical wall ground improvement body 10,. Arranged to reach.
Here, the depth E of the retaining wall portion ground improvement body 2 and the height of the retaining wall portion ground improvement body 2 are the lengths in the front-rear direction from the front surface of the front wall ground improvement body 9 to the rear surface of the vertical wall ground improvement body 10. The ratio (E / H) to the height H is about 0.3 to 0.4.

以上のような地盤改良体からなる擁壁の構造によれば、前壁状地盤改良体9の背面から後方へ延びる垂直壁状地盤改良体10,…が擁壁の前方への倒れを抑制するとともに、擁壁部地盤改良体2の強度と剛性も増加することから、地盤改良体2A,2B,…,2Eを、平面視略櫛の歯状として地盤改良体全体の体積を小さくすることができるため、地盤改良を行う範囲を小さくすることができる。
よって、盛土の掘削範囲及び地盤改良体の量を削減することができるため、実施の形態1の擁壁の構造と比較して、さらに工期の短縮及び施工コストの削減を図ることができる。
According to the structure of the retaining wall composed of the ground improvement body as described above, the vertical wall-like ground improvement body 10 extending backward from the back surface of the front wall-like ground improvement body 9 prevents the retaining wall from falling forward. In addition, since the strength and rigidity of the retaining wall portion ground improvement body 2 also increase, the ground improvement bodies 2A, 2B,... Therefore, the range for ground improvement can be reduced.
Therefore, since the excavation range of the embankment and the amount of ground improvement body can be reduced, the construction period can be further shortened and the construction cost can be reduced as compared with the retaining wall structure of the first embodiment.

実施の形態3.
図6は本発明の実施の形態3に係る地盤改良体からなる擁壁の構造を示す縦断側面図であり、実施の形態1の図1及び実施の形態2の図4と同一符号は同一又は相当部分を示している。実施の形態3に係る地盤改良体からなる擁壁は、実施の形態1と同様の方法により施工される。
Embodiment 3 FIG.
FIG. 6 is a longitudinal side view showing the structure of a retaining wall made of a ground improvement body according to Embodiment 3 of the present invention. The same reference numerals as those in FIG. 1 of Embodiment 1 and FIG. 4 of Embodiment 2 are the same or The corresponding part is shown. The retaining wall made of the ground improvement body according to the third embodiment is constructed by the same method as in the first embodiment.

実施の形態3において、上下複数の地盤改良体2A,2B,…,2Eは、これらの上下の地盤改良体間の接合面、すなわち地盤改良体2A,2B間の接合面、地盤改良体2B,2C間の接合面、地盤改良体2C,2D間の接合面及び地盤改良体2D,2E間の接合面を前上がり傾斜面としている。
したがって、上側の地盤改良体がその重力により前上がり傾斜面に沿って背面側へ移動する方向の分力が作用し、より大きな土圧に対抗することができることから、地盤改良体の前後方向の長さを小さくすることができるため、地盤改良を行う範囲を小さくすることができる。
よって、盛土の掘削範囲及び地盤改良体の量を削減することができるため、さらに工期の短縮及び施工コストの削減を図ることができる。
なお、底部地盤改良体1とその上の地盤改良体2Aとの間の接合面を前上がり傾斜面としてもよい。
In Embodiment 3, the plurality of upper and lower ground improvement bodies 2A, 2B,..., 2E are joined surfaces between the upper and lower ground improvement bodies, that is, the joint surfaces between the ground improvement bodies 2A and 2B, the ground improvement bodies 2B, The joint surface between 2C, the joint surface between the ground improvement bodies 2C and 2D, and the joint surface between the ground improvement bodies 2D and 2E are inclined upwards.
Therefore, a component force in the direction in which the upper ground improvement body moves forward along the inclined surface due to the gravity acts on the back side, and can resist a larger earth pressure. Since the length can be reduced, the range for ground improvement can be reduced.
Therefore, since the excavation range of the embankment and the amount of ground improvement body can be reduced, the construction period can be further shortened and the construction cost can be reduced.
In addition, it is good also considering the joining surface between the bottom part ground improvement body 1 and the ground improvement body 2A on it as a front rising inclination surface.

以上の説明においては、掘下げにより取った土に、例えば二酸化けい素、酸化アルミニウム、酸化カルシウム及び三酸化イオウ等の成分からなるセメント系固化材等の固化材を添加混合して地盤改良を行う場合について説明したが、前記固化材に、ロックウール繊維、PVA繊維、ポリプロピレン繊維又はスチール繊維等の補強繊維(例えば数mmから数十mm程度の繊維長のもの。)を十分に分散させて混合してもよく、このような補強繊維を用いれば、底部地盤改良体1及び擁壁部地盤改良体2の強度が高くなるため、地盤改良体の量をさらに削減することができる。
よって、盛土の掘削範囲及び地盤改良体の量をさらに削減して、工期の短縮及び施工コストの削減を図ることができる。
In the above description, when soil is improved by adding and mixing solidified material such as cement-based solidified material composed of components such as silicon dioxide, aluminum oxide, calcium oxide and sulfur trioxide, etc., to the soil taken by digging However, reinforcing fibers such as rock wool fibers, PVA fibers, polypropylene fibers or steel fibers (for example, fibers having a fiber length of about several mm to several tens mm) are sufficiently dispersed and mixed in the solidified material. If such a reinforcing fiber is used, the strength of the bottom ground improvement body 1 and the retaining wall ground improvement body 2 is increased, and therefore the amount of the ground improvement body can be further reduced.
Therefore, the excavation range of the embankment and the amount of ground improvement body can be further reduced to shorten the construction period and the construction cost.

本発明の実施の形態1に係る地盤改良体からなる擁壁の構造を示す縦断側面図である。It is a vertical side view which shows the structure of the retaining wall which consists of a ground improvement body which concerns on Embodiment 1 of this invention. 同じく正面図である。It is also a front view. 施工方法を示す縦断側面図であり、(a)は底部地盤改良体上に段状の盛土を行った状態を、(b)は排水管を布設し、地盤改良体を形成して裏込め材を充填した上に段状の盛土を行った状態を示している。It is a longitudinal side view showing the construction method, (a) is a state where a stepped embankment is performed on the bottom ground improvement body, (b) is a backfill material by laying a drain pipe and forming a ground improvement body The state where the step-shaped embankment was performed on the top of which is filled is shown. 本発明の実施の形態2に係る地盤改良体からなる擁壁の構造を示す縦断側面図である。It is a vertical side view which shows the structure of the retaining wall which consists of a ground improvement body which concerns on Embodiment 2 of this invention. 図4の矢視X−X断面図である。It is arrow XX sectional drawing of FIG. 本発明の実施の形態3に係る地盤改良体からなる擁壁の構造を示す縦断側面図である。It is a vertical side view which shows the structure of the retaining wall which consists of a ground improvement body which concerns on Embodiment 3 of this invention.

符号の説明Explanation of symbols

A 原地盤
B 基礎地盤
E 擁壁部地盤改良体の奥行き
S 法面
SB 後側地盤の法面
1 底部地盤改良体
2 擁壁部地盤改良体
2A,2B,2C,2D,2E 地盤改良体
3 透水層
4 裏込め材
5,5A,5B,5C,5D,5E 排水管
6 保護部材
7 凹凸係合部
8A,8B,8C 段状の盛土
9 前壁状地盤改良体
10 垂直壁状地盤改良体
A Original ground B Foundation ground E Depth of retaining wall ground improvement S Slope SB Rear ground slope 1 Bottom ground improvement 2 Retaining wall ground improvement 2A, 2B, 2C, 2D, 2E Ground improvement 3 Water permeable layer 4 Backfill material 5, 5A, 5B, 5C, 5D, 5E Drain pipe 6 Protective member 7 Concave engaging portion 8A, 8B, 8C Stepped embankment 9 Front wall ground improvement body 10 Vertical wall ground improvement body

Claims (5)

基礎地盤の掘下げ部を地盤改良して形成された底部地盤改良体と、
該底部地盤改良体上の盛土を地盤改良して形成され、法面が連続するように順次積み重ねられた上下複数の地盤改良体からなる擁壁部地盤改良体と、
前記上下複数の地盤改良体の背面側の盛土を掘り下げて裏込め材を充填して形成された、前記擁壁部地盤改良体の背面に接して上下方向に延びる透水層と、
該透水層から前記擁壁部地盤改良体の法面まで延び、前記擁壁部地盤改良体の背面側の水を正面側へ排水する排水管と、
前記擁壁部地盤改良体の法面及び上面並びに前記透水層の上面を保護する保護部材と、
からなることを特徴とする地盤改良体からなる擁壁の構造。
A bottom ground improvement body formed by improving the ground excavation of the foundation ground,
Retaining wall part ground improvement body which is formed by ground improvement on the bottom ground improvement body and is composed of a plurality of upper and lower ground improvement bodies which are sequentially stacked so that the slopes are continuous,
A permeable layer extending in the vertical direction in contact with the back surface of the retaining wall portion ground improvement body, formed by digging up the backside embankment of the plurality of upper and lower ground improvement bodies and filled with a backfilling material;
A drainage pipe extending from the water permeable layer to the slope of the retaining wall portion ground improvement body, and draining water on the back side of the retaining wall portion ground improvement body to the front side;
A protective member for protecting the slope and upper surface of the retaining wall portion ground improvement body and the upper surface of the water permeable layer;
Retaining wall structure consisting of ground improvement body characterized by comprising.
前記底部地盤改良体及び擁壁部地盤改良体の上下の地盤改良体間の接合面に凹凸係合部を形成又は前記接合面の上下に渡るダボを配設してなる請求項1記載の地盤改良体からなる擁壁の構造。   2. The ground according to claim 1, wherein an uneven engagement portion is formed on a joint surface between upper and lower ground improvement bodies of the bottom ground improvement body and the retaining wall ground improvement body, or a dowel extending above and below the joint surface is disposed. Retaining wall structure consisting of an improved body. 前記底部地盤改良体及び擁壁部地盤改良体の上下の地盤改良体間の接合面を前上がり傾斜面としてなる請求項1記載の地盤改良体からなる擁壁の構造。   The structure of the retaining wall which consists of a ground improvement body of Claim 1 which makes a joint surface between the bottom ground improvement body and the ground improvement body of the upper and lower sides of a said bottom part ground improvement body and a ground improvement body a front rising slope. 前記擁壁部地盤改良体を、その法面を形成する前壁状地盤改良体及び該前壁状地盤改良体の背面から後方へ延びる、複数の垂直壁状地盤改良体からなる、平面視略櫛の歯状としてなる請求項1〜3の何れかに記載の地盤改良体からなる擁壁の構造。   The retaining wall portion ground improvement body is composed of a front wall-like ground improvement body forming a slope and a plurality of vertical wall-like ground improvement bodies extending rearward from the back surface of the front wall-like ground improvement body. The structure of the retaining wall which consists of a ground improvement body in any one of Claims 1-3 which becomes a tooth shape of a comb. 基礎地盤の表層部を掘り下げ、該掘下げにより取った土に固化材を添加混合して埋め戻して敷き均し、締め固めることにより、底部地盤改良体を形成する工程と、
後側地盤の法面から所望の擁壁法面にわたって前方へ延びる段状の盛土を行う工程、該段状の盛土を下位地盤改良体の上面まで掘り下げる工程、該掘下げにより取った土に固化材を添加混合して埋め戻して敷き均し、締め固めるとともに、法勾配を整形することにより上位地盤改良体を形成する工程、該上位地盤改良体の形成前又は形成途中において、その法面から背面まで延びる排水管を布設する工程、及び、前記上位地盤改良体の背面側の盛土を掘り下げて裏込め材を充填する工程、を繰り返して、法面が連続するように順次積み重ねられた上下複数の地盤改良体からなる擁壁部地盤改良体、該擁壁部地盤改良体の背面に接して上下方向に延びる透水層及び前記擁壁部地盤改良体の背面側の水を正面側へ排水する排水管を、前記底部地盤改良体上に構築する工程と、
前記擁壁部地盤改良体の法面及び上面並びに前記透水層の上面の保護工を行う工程と、
からなることを特徴とする地盤改良体からなる擁壁の施工方法。
Digging the surface layer part of the foundation ground, adding the solidification material to the soil taken by the digging down, backfilling and leveling, compacting, and forming a bottom ground improvement body,
A step of performing stepped banking extending from the slope of the rear ground to the desired retaining wall slope, a step of digging the stepped bank to the upper surface of the lower ground improvement body, a solidified material on the soil taken by the digging Adding and mixing, backfilling, leveling, compacting, and forming the upper ground improvement body by shaping the normal gradient, before or during the formation of the upper ground improvement body, from the slope to the back Repeating a step of laying a drain pipe extending to the back and a step of digging up the embankment on the back side of the upper ground improvement body and filling a backfilling material, and a plurality of upper and lower layers sequentially stacked so that the slope is continuous Retaining wall part ground improvement body made of ground improvement body, water permeable layer extending in the vertical direction in contact with the back surface of the retaining wall part ground improvement body, and drainage for draining water on the back side of the retaining wall part ground improvement body to the front side Tube, said bottom ground And a step to build on a good body,
A process of protecting the slope and upper surface of the retaining wall portion ground improvement body and the upper surface of the water permeable layer;
A method for constructing a retaining wall comprising a ground improvement body characterized by comprising:
JP2008150042A 2008-06-09 2008-06-09 Retaining wall structure consisting of ground improvement body and its construction method Active JP5146117B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2008150042A JP5146117B2 (en) 2008-06-09 2008-06-09 Retaining wall structure consisting of ground improvement body and its construction method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2008150042A JP5146117B2 (en) 2008-06-09 2008-06-09 Retaining wall structure consisting of ground improvement body and its construction method

Publications (2)

Publication Number Publication Date
JP2009293331A true JP2009293331A (en) 2009-12-17
JP5146117B2 JP5146117B2 (en) 2013-02-20

Family

ID=41541746

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2008150042A Active JP5146117B2 (en) 2008-06-09 2008-06-09 Retaining wall structure consisting of ground improvement body and its construction method

Country Status (1)

Country Link
JP (1) JP5146117B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016102313A (en) * 2014-11-27 2016-06-02 旭化成ジオテック株式会社 Retaining wall structure and construction method thereof
JP2016156216A (en) * 2015-02-25 2016-09-01 株式会社竹中工務店 Mountain retention wall
KR20190026376A (en) * 2017-09-05 2019-03-13 (주) 지오시스 Construction method of earth structures
CN114263183A (en) * 2020-09-16 2022-04-01 深圳市能亿建设工程有限公司 Foundation pit supporting structure
CN115324084A (en) * 2022-08-19 2022-11-11 中交路桥建设有限公司 Foundation pit slope top water dispersing method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56125532A (en) * 1980-03-05 1981-10-01 Yoshiro Wakimura Construction of slope of road, reservoir, etc.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56125532A (en) * 1980-03-05 1981-10-01 Yoshiro Wakimura Construction of slope of road, reservoir, etc.

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016102313A (en) * 2014-11-27 2016-06-02 旭化成ジオテック株式会社 Retaining wall structure and construction method thereof
JP2016156216A (en) * 2015-02-25 2016-09-01 株式会社竹中工務店 Mountain retention wall
KR20190026376A (en) * 2017-09-05 2019-03-13 (주) 지오시스 Construction method of earth structures
KR102211069B1 (en) * 2017-09-05 2021-02-02 (주) 지오시스 Construction method of earth structures
CN114263183A (en) * 2020-09-16 2022-04-01 深圳市能亿建设工程有限公司 Foundation pit supporting structure
CN114263183B (en) * 2020-09-16 2023-04-07 深圳市能亿建设工程有限公司 Foundation pit supporting structure
CN115324084A (en) * 2022-08-19 2022-11-11 中交路桥建设有限公司 Foundation pit slope top water dispersing method

Also Published As

Publication number Publication date
JP5146117B2 (en) 2013-02-20

Similar Documents

Publication Publication Date Title
US6089792A (en) Reinforced retaining wall
KR101006900B1 (en) Construction Method of Fill-Up Structure for Back-Area of Rigid Structure
JP5146117B2 (en) Retaining wall structure consisting of ground improvement body and its construction method
JP2011202499A (en) Structure of boundary between upper and lower blocks in structural material and structural material
KR101324231B1 (en) Soil cement wall structure and method for constructing thereof
JP7232714B2 (en) how to build a foundation
CN205669211U (en) A kind of prefabricated Gravity Retaining Wall
JP3829319B2 (en) Construction method of underground hollow structure and its underground hollow structure
KR20000003270A (en) Tunnel construction method at area of thin soil surface
JPH05230845A (en) L-shaped block retaining wall structure and construction method thereof
JP4699655B2 (en) How to create steep banking
JP5800546B2 (en) Precast foundation plates, foundations for precast structures and construction methods for earth retaining structures
JP6669435B2 (en) Construction method of dam and dam
JP5915074B2 (en) How to form an underground space under a ground transportation
JP6860895B2 (en) Retaining wall and its construction method
JP4612356B2 (en) How to create a slope
JP2004263490A (en) Underground composite wall
JP2020007735A (en) Method for reinforcing foundation structure and structure for reinforcing foundation structure
JP3713117B2 (en) How to build the foundation
JP7204228B2 (en) Underground beam construction method
JP4344733B2 (en) Seismic reinforcement structure for existing pile foundation structures
JP3674439B2 (en) Composite type underground continuous wall and construction method of the same wall
JP5294117B2 (en) Dirt floor
KR101574666B1 (en) Embankment type reinforced earth retaining wall
JP2014177787A (en) Open shield method

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20110328

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20120627

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20120710

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20120801

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20121030

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20121112

R150 Certificate of patent or registration of utility model

Ref document number: 5146117

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20151207

Year of fee payment: 3

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250