JP3669247B2 - Anchor anchor method for soft sandy ground - Google Patents

Anchor anchor method for soft sandy ground Download PDF

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Publication number
JP3669247B2
JP3669247B2 JP2000104065A JP2000104065A JP3669247B2 JP 3669247 B2 JP3669247 B2 JP 3669247B2 JP 2000104065 A JP2000104065 A JP 2000104065A JP 2000104065 A JP2000104065 A JP 2000104065A JP 3669247 B2 JP3669247 B2 JP 3669247B2
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JP
Japan
Prior art keywords
anchor
excavation
area
ground
sandy ground
Prior art date
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Expired - Fee Related
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JP2000104065A
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Japanese (ja)
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JP2001226968A (en
Inventor
博明 妹尾
健二 中野
智晴 大西
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.)
Taisei Corp
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Taisei Corp
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Filing date
Publication date
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Priority to JP2000104065A priority Critical patent/JP3669247B2/en
Publication of JP2001226968A publication Critical patent/JP2001226968A/en
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Publication of JP3669247B2 publication Critical patent/JP3669247B2/en
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Description

【０００１】
【発明が属する技術分野】
本発明は、軟弱砂質土地盤の山留めアンカー方法に関するものである。
【０００２】
【従来の技術】
軟弱地盤の掘削に先立って、掘削域の外側の地盤の所定位置を固化材の攪拌混合により固化処理して定着域を形成し、この定着域に山留め壁のアンカーを定着させて、アンカーの定着力を高めるようにした技術は既知である（特許第２７４９３８８号公報参照）。
【０００３】
【発明が解決しようとする課題】
本発明が解決しようとする課題（本発明の目的）は、掘削地盤が軟弱砂質土地盤の場合に前記公知技術よりもコスト的に有利に山留め壁のアンカーの定着力を高めることができる技術（軟弱砂質土地盤の山留めアンカー方法）を提供することにある。
【０００４】
【課題を解決するための手段】
前記課題を解決するために、請求項１に係る発明では、軟弱砂質土地盤の掘削に先立って、掘削域の外側の所定範囲の地盤を締固め砂杭の造成により締固め、この締固め域に掘削作業の進行に伴って設置される山留め壁のアンカーを定着させて、アンカーの定着力を増大させるようにしている。
【０００５】
なお、本発明における締固め域は締固め砂杭部とその周辺の締固め地盤部とから成り、アンカーの定着はこの両者に亙ってなされる。
【０００６】
【発明の実施の形態】
本発明の説明図である図１において、１は軟弱砂質土地盤、２は軟弱砂質土地盤１の一部の掘削域であり、掘削域２は、例えば地下構築物を構築するために、図に点線で示す深度まで掘削されるようになっており、図は掘削が途中まで進んだ段階の状態を示している。
【０００７】
本発明では、掘削域２の掘削に先立って、掘削域２の外側の所定範囲の地盤に締固め砂杭３を造成し、地盤を締固めて、締固め域４を形成する。
【０００８】
締固め砂杭３の造成は、振動式もしくは静的な締固め砂杭工法により行い、材料砂には、砂に限らず、砂利、砕石等の砂類似の材料も使用できる。
【０００９】
前述のようにして締固め域４を形成した後、掘削域２の掘削を始め、その進行に伴って設置される山留め壁５のアンカー６を締固め域４に順次、定着させる。
【００１０】
アンカー６の設置・定着は、山留め壁５から締固め域４の外縁に至る孔を穿設し、この孔にアンカー６を挿入した後、締固め域４を横断する孔の先端部に適宜のグラウトを施し、アンカー６の露出側端部は横ばた７を介して山留め壁５に固定する、という態様で行うことができる。
【００１１】
なお、本発明は、図示のように山留め壁５を予め、所定深度まで打設する場合のみならず、山留め壁５を掘削の進行に伴い順次、建て込む場合にも適用されることは言うまでもない。
【図面の簡単な説明】
【図１】本発明の一実施態様を説明するための断面図である。
【符号の説明】
１：軟弱砂質土地盤、２：掘削域、３：締固め砂杭、４：締固め域、５：山留め壁、６：アンカー、７：横ばた。[0001]
[Technical field to which the invention belongs]
The present invention relates to a mountain anchoring method for soft sandy ground.
[0002]
[Prior art]
Prior to excavation of the soft ground, a fixed area is formed by solidifying the predetermined position of the ground outside the excavation area by stirring and mixing of the solidifying material, and anchors of the retaining wall are fixed in this fixing area, and the anchor is fixed. A technique for increasing the force is already known (see Japanese Patent No. 2749388).
[0003]
[Problems to be solved by the invention]
A problem to be solved by the present invention (object of the present invention) is a technique capable of increasing anchor anchoring power of a retaining wall more advantageously than the known technique when excavated ground is soft sandy ground. It is to provide (mounting anchor method for soft sandy ground).
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, in the invention according to claim 1, prior to excavation of the soft sandy ground, a predetermined range of ground outside the excavation area is compacted by compacting a sand pile, and this compaction is performed. The anchor of the retaining wall installed in the area as the excavation work progresses is fixed to increase the anchoring force of the anchor.
[0005]
In the present invention, the compaction area is composed of a compacted sand pile portion and a compacted ground portion around the compacted sand pile portion, and anchor anchoring is performed over both.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
In FIG. 1, which is an explanatory diagram of the present invention, 1 is a soft sandy ground, 2 is a partial excavation area of the soft sandy ground 1, and the excavation area 2 is, for example, for constructing an underground structure. Excavation is carried out to a depth indicated by a dotted line in the figure, and the figure shows a state where the excavation has progressed halfway.
[0007]
In the present invention, prior to excavation in the excavation area 2, the compacted sand pile 3 is formed on the ground in a predetermined range outside the excavation area 2, and the ground is compacted to form the compaction area 4.
[0008]
The compacted sand pile 3 is formed by a vibration type or static compacted sand pile construction method, and the material sand is not limited to sand, and sand-like materials such as gravel and crushed stone can be used.
[0009]
After the compaction area 4 is formed as described above, excavation of the excavation area 2 is started, and the anchors 6 of the retaining walls 5 that are installed as the progress proceeds are sequentially fixed in the compaction area 4.
[0010]
The anchor 6 is installed and fixed by drilling a hole from the mountain retaining wall 5 to the outer edge of the compaction area 4, inserting the anchor 6 into this hole, and then appropriately attaching the anchor 6 to the tip of the hole crossing the compaction area 4. A grout can be applied, and the exposed side end of the anchor 6 can be fixed to the mountain retaining wall 5 via a lateral flat 7.
[0011]
In addition, it goes without saying that the present invention is applied not only to the case where the retaining wall 5 is driven in advance to a predetermined depth as shown in the figure, but also to the case where the retaining wall 5 is sequentially built as the excavation proceeds. .
[Brief description of the drawings]
FIG. 1 is a cross-sectional view for explaining one embodiment of the present invention.
[Explanation of symbols]
1: soft sandy ground, 2: excavation area, 3: compacted sand pile, 4: compacted area, 5: retaining wall, 6: anchor, 7: flat.

Claims (1)

軟弱砂質土地盤の掘削に先立って、掘削域の外側の所定範囲の地盤を締固め砂杭の造成により締固め、この締固め域に掘削作業の進行に伴って設置される山留め壁のアンカーを定着させて、アンカーの定着力を増大させることを特徴とする軟弱砂質土地盤の山留めアンカー方法。  Prior to excavation of soft sandy ground, the ground of a predetermined range outside the excavation area is compacted by compaction of sand piles, and anchors of mountain retaining walls installed in the compaction area as the excavation work proceeds Anchoring method for soft sandy ground, characterized in that the anchoring force of the anchor is increased to increase anchorage.
JP2000104065A 2000-02-17 2000-02-17 Anchor anchor method for soft sandy ground Expired - Fee Related JP3669247B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000104065A JP3669247B2 (en) 2000-02-17 2000-02-17 Anchor anchor method for soft sandy ground

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Application Number Priority Date Filing Date Title
JP2000104065A JP3669247B2 (en) 2000-02-17 2000-02-17 Anchor anchor method for soft sandy ground

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JP3669247B2 true JP3669247B2 (en) 2005-07-06

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102535477A (en) * 2011-12-29 2012-07-04 中铁十六局集团北京轨道交通工程建设有限公司 Safety construction method for cutting off anchor cables of support of excavating foundation pit
CN105569048A (en) * 2014-10-20 2016-05-11 中建四局第一建筑工程有限公司 Method for accelerating foundation ditch construction process

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102561358A (en) * 2010-12-22 2012-07-11 中国建筑第七工程局有限公司 Construction method of ahead mini type composite soil nail wall support
AP2014007534A0 (en) 2011-09-27 2014-03-31 Maurice Garzon Method for forming a retaining wall, and corresponding retaining wall
CN102877470B (en) * 2012-07-27 2015-11-25 湖南恒盾岩土工程注浆科技有限公司 Combined soil nailing construction method for supporting
CN104863162B (en) * 2015-06-11 2017-03-22 西安科技大学 Foundation pit support system applied to expansive soil regions and construction method thereof
JP6606909B2 (en) * 2015-08-04 2019-11-20 株式会社大林組 Deformation prevention structure of retaining wall and deformation prevention method of retaining wall
CN112854240A (en) * 2021-01-13 2021-05-28 中国建筑第八工程局有限公司 Method for reinforcing anchor cable in soft soil area by electrifying

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102535477A (en) * 2011-12-29 2012-07-04 中铁十六局集团北京轨道交通工程建设有限公司 Safety construction method for cutting off anchor cables of support of excavating foundation pit
CN102535477B (en) * 2011-12-29 2014-05-14 中铁十六局集团北京轨道交通工程建设有限公司 Safety construction method for cutting off anchor cables of support of excavating foundation pit
CN105569048A (en) * 2014-10-20 2016-05-11 中建四局第一建筑工程有限公司 Method for accelerating foundation ditch construction process

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