JP3702435B2 - How to build the foundation - Google Patents
How to build the foundation Download PDFInfo
- Publication number
- JP3702435B2 JP3702435B2 JP01749996A JP1749996A JP3702435B2 JP 3702435 B2 JP3702435 B2 JP 3702435B2 JP 01749996 A JP01749996 A JP 01749996A JP 1749996 A JP1749996 A JP 1749996A JP 3702435 B2 JP3702435 B2 JP 3702435B2
- Authority
- JP
- Japan
- Prior art keywords
- pile
- foundation
- ground
- soil
- predetermined
- 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.)
- Expired - Lifetime
Links
Images
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Piles And Underground Anchors (AREA)
- Foundations (AREA)
Description
【0001】
【発明の属する技術分野】
この発明は、建造物における杭を使用した基礎の構築方法に関する。
【0002】
【従来の技術】
従来は、杭基礎は、所定地盤に直接に杭を施工し、その後必要ならば、所定深さまで、根切りし、所定のフーチングを構築し、全ての荷重を杭に負担させていた。
【0003】
【発明が解決しようとする課題】
前記従来の技術では、地盤と杭との一体性が弱く、杭と地盤とが別々に動き、耐力的に安定性が小さい問題点があった。また、根切りの際に生じる残土は埋め戻すことができたが、根切り前に生じた杭穴掘削泥土は、脱水して産業廃棄物として処理するしか方策がなく、泥土の処理が面倒となる問題点があった。
【0004】
【課題を解決するための手段】
然るにこの発明は、杭の構築前に所定の根切りをして、安定した強度を有する改良土を杭の構築後に埋め戻し、締め固めをするので、前記問題点を解決した。
【0005】
即ちこの発明は、杭構築予定位置の周辺部を所定深さまで根切りし、該根切りをして生じる残土を保管し、続いて所定位置に杭を施工し、杭施工により生じる泥土を排出し、前記残土に前記泥土及び所定の改良剤を添加混合して、改良土を生成し、該改良土を前記根切り内に埋め戻して地盤を形成し、該地盤と前記杭とで基礎を構成することを特徴とした基礎の構築方法である。
【0006】
また、前記において、根切りの深さを、杭径の2〜10倍とすると共に、改良土により形成される地盤が、3Kg/cm2以上の地盤強度を有するように基礎を形成する基礎の構築方法である。
【0007】
前記において、地盤の強度を3Kg/cm2以下とした場合には、従来の改良前の地盤強度と大差がなく、有効な水平抵抗の向上を期待できない。
【0008】
また、前記において、根切りの深さが杭径の2倍以下では、杭との一体化を図れず、10倍以上では施工経済性を失う。
【0009】
【実施の態様】
通常は、根切りにより生じた残土に、杭穴の掘削により生じた掘削泥土、改良剤を混入して改良土を生成する。また、他の場合には、杭穴の掘削により生じた掘削泥土に改良剤を混入して改良土を生成する。
【0010】
また、杭の施工は、現場造成杭、既成杭、あるいはそれらの混合のいずれでも可能である。
【0011】
【作用】
埋め戻された改良土により地盤が形成され、地盤と杭の頭部とが一体の基礎を構成でき、水平耐力を向上させることができる。また、杭穴掘削により生じる泥土は、改良土の生成に消費される。
【0012】
【実施例1】
図面に基づきこの発明の実施例を説明する。
【0013】
杭構築位置(即ち、建造物構築位置)の地面1を、基礎構造の耐力の向上を必要とする所定の深さHまで根切りし、構築現場内で残土2を保管する(図1(a))。
【0014】
その後、根切り底3を整え、所定の杭穴4を掘削し、掘削泥土を排出する。前記残土に、前記掘削泥土及びセメント系改良剤(例えば、普通ポルとランドセメント)を添加し混合して改良土6を生成する。
【0015】
一方、従来の方法により、前記杭穴4を掘削後あるいは杭穴4を掘削しながら、杭穴4内に既成コンクリート杭5を埋設設置する(図1(b))。
【0016】
続いて、前記改良土6を、根切り内の所定の深さ(計画フーチングの下面)まで埋め戻して地盤7を形成し、該地盤7と杭5とが一体となった基礎8を構築する(図1(c))。続いて、前記杭5に所定の杭頭処理をし、所定の配筋後に、地盤7上にコンクリートを打設してフーチングを形成して、所定の建造物を構築する(図示していない)。
【0017】
前記において、地盤7は、地盤強度が3Kg/cm2以上となるように形成する。また、根切りの深さHは、杭径の2〜10倍程度で形成する。例えば、杭穴径600cm、深さ30m程度の杭穴4を掘削し、既成コンクリート杭5を埋設する場合には、根切りの深さHは、杭径の2〜10倍程度、即ち1.2〜6m程度まで行うことが望ましい。また、地階を構築する際、あるいは地盤の土質等の条件により、適宜深さを変更する。
【0018】
従って、構築された地盤は杭と一体となり、荷重を負担できる。よって、従来の必要強度を満たせば、杭の構築本数を削減し、あるいは構築する杭の口径を小さくできる。
【0019】
前記実施例において、改良土の生成にあたり、現場敷地内、あるいは現場敷地に近接して改良土生成プラントを構築することもできる。
【0020】
また、前記実施例において、改良土は根切りにより生じた残土に掘削泥土、改良剤を添加して生成したが、残土は使用せず、掘削泥土に改良剤を添加して改良土を生成することもできる。
【0021】
また、前記実施例において、既成コンクリート杭5を使用したが、鋼管杭その他の既成杭、あるいは現場打ち杭とすることもできる(図示していない)。
【0022】
また、前記実施例において、下層地盤にネガティブフリクションが作用する場合には、杭の下部にフリクションカットを施すことも可能である。この場合にも所定の強度を有する改良土による地盤と杭の杭頭部とが一体化しているので、有効に支持力を発揮できる。
【0023】
【発明の効果】
この発明の基礎杭の構築方法によれば、構築された地盤は杭と一体となり、荷重を負担するので、基礎の耐力を強化できる効果がある。よって、杭の埋設本数を削減し、杭の口径を小さくした場合でも、従来の必要耐力を満した基礎を構築できる効果がある。
【0024】
また、杭穴掘削により生じる掘削泥土は改良土生成に消費されるので、基礎杭構築に際し、掘削泥土を構築現場内で有効活用ができると共に、産業廃棄物として処理する泥土を無くしあるいは大幅削減できる効果がある。
【図面の簡単な説明】
【図1】(a)乃至(c)は、この発明の実施例の方法を説明する概略した縦断面図である。
【符号の説明】
1 地面
2 残土
3 根切り底
4 杭穴
5 既成コンクリート杭
6 改良土
7 地盤
8 基礎[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a foundation construction method using piles in a building.
[0002]
[Prior art]
Conventionally, pile foundations have been built directly on a predetermined ground, and then, if necessary, rooted to a predetermined depth, constructed a predetermined footing, and loaded all loads on the pile.
[0003]
[Problems to be solved by the invention]
In the prior art, the integrity of the ground and the pile is weak, the pile and the ground move separately, and there is a problem that the stability is small in terms of yield strength. In addition, the remaining soil generated during root cutting could be backfilled, but the pile hole excavation mud generated before root cutting was only dehydrated and treated as industrial waste, which was cumbersome to treat the mud. There was a problem.
[0004]
[Means for Solving the Problems]
However, the present invention solves the above-mentioned problems because predetermined root cutting is performed before the pile is constructed, and the improved soil having a stable strength is backfilled and compacted after the pile is constructed.
[0005]
That is, the present invention cuts the periphery of the pile construction planned position to a predetermined depth , stores the residual soil generated by cutting the root, then constructs the pile at the predetermined position, and discharges mud produced by the pile construction. In addition, the mud soil and a predetermined improver are added to and mixed with the remaining soil to generate improved soil , and the improved soil is backfilled into the root cutting to form a ground, and the ground and the pile constitute a foundation. It is a foundation construction method characterized by doing.
[0006]
Also, in the above, the depth of the root cutting, with 2 to 10 times the pile diameter, ground formed by the modified soil forms a basis so as to have a 3 Kg / cm 2 or more of the ground strength basis This is the construction method.
[0007]
In the above, when the strength of the ground is 3 Kg / cm 2 or less, there is no significant difference from the conventional ground strength before improvement, and improvement in effective horizontal resistance cannot be expected.
[0008]
Moreover, in the above, if the depth of root cutting is 2 times or less of the pile diameter, integration with the pile cannot be achieved, and if it is 10 times or more, the construction economy is lost.
[0009]
Embodiment
Usually, improved soil is produced by mixing excavated mud and improver produced by excavating pile holes into the remaining soil produced by root cutting. In other cases, the improved soil is generated by mixing the improver with the excavated mud produced by excavating the pile hole.
[0010]
Moreover, the construction of the pile can be any of a site-constructed pile, an existing pile, or a mixture thereof.
[0011]
[Action]
The ground is formed by the backfilled improved soil, and the ground and the head of the pile can constitute an integral foundation, and the horizontal strength can be improved. In addition, mud produced by excavating pile holes is consumed for generating improved soil.
[0012]
[Example 1]
Embodiments of the present invention will be described with reference to the drawings.
[0013]
The
[0014]
Then, the
[0015]
On the other hand, after excavating the
[0016]
Subsequently, the improved
[0017]
In the above description, the ground 7 is formed so that the ground strength is 3 kg / cm 2 or more. Moreover, the depth H of root cutting is formed about 2 to 10 times the pile diameter. For example, when a
[0018]
Therefore, the constructed ground can be integrated with the pile and bear the load. Therefore, if the conventional required strength is satisfied, the number of piles to be built can be reduced or the diameter of the piles to be built can be reduced.
[0019]
In the said Example, in the production | generation of improved soil, the improved soil production | generation plant can also be constructed in the site site or close to the site site.
[0020]
Moreover, in the said Example, although improved soil was produced | generated by adding excavation mud and an improving agent to the residual soil produced by root cutting, the remaining soil is not used, but an improving agent is added to excavated mud to produce improved soil. You can also.
[0021]
Moreover, in the said Example, although the ready-made
[0022]
Moreover, in the said Example, when a negative friction acts on a lower layer ground, it is also possible to give a friction cut to the lower part of a pile. Also in this case, since the ground by the improved soil having a predetermined strength and the pile head of the pile are integrated, the supporting force can be effectively exhibited.
[0023]
【The invention's effect】
According to the foundation pile construction method of the present invention, the constructed ground is integrated with the pile and bears a load, so that there is an effect that the strength of the foundation can be enhanced. Therefore, even when the number of piles embedded is reduced and the diameter of the piles is reduced, it is possible to construct a foundation that satisfies the conventional required proof stress.
[0024]
In addition, since the excavated mud generated by drilling the hole is consumed for the generation of improved soil, the excavated mud can be used effectively at the construction site when constructing the foundation pile, and the mud treated as industrial waste can be eliminated or greatly reduced. effective.
[Brief description of the drawings]
FIGS. 1A to 1C are schematic longitudinal sectional views illustrating a method of an embodiment of the present invention.
[Explanation of symbols]
1
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP01749996A JP3702435B2 (en) | 1996-02-02 | 1996-02-02 | How to build the foundation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP01749996A JP3702435B2 (en) | 1996-02-02 | 1996-02-02 | How to build the foundation |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH09209371A JPH09209371A (en) | 1997-08-12 |
JP3702435B2 true JP3702435B2 (en) | 2005-10-05 |
Family
ID=11945692
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP01749996A Expired - Lifetime JP3702435B2 (en) | 1996-02-02 | 1996-02-02 | How to build the foundation |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3702435B2 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4555974B2 (en) * | 2000-09-27 | 2010-10-06 | 三谷セキサン株式会社 | Construction method of foundation pile to improve ground around pile head |
JP5404184B2 (en) * | 2008-09-24 | 2014-01-29 | 株式会社秋月事務所 | Apartment house structure |
CN108239989B (en) * | 2018-02-10 | 2024-02-13 | 陕西华邦建设工程有限公司 | Environment-friendly collapsible loess foundation structure and treatment method thereof |
CN109518698B (en) * | 2018-12-20 | 2023-11-17 | 中铁二院工程集团有限责任公司 | Water-rich deep foundation pit support structure close to operating high-iron sand pebble layer and construction method thereof |
CN109853519A (en) * | 2019-01-30 | 2019-06-07 | 山西三建集团有限公司 | The processing structure and processing method of ladder-like easy-weathering holystone layer substrate ground |
CN111424634A (en) * | 2019-11-18 | 2020-07-17 | 国网浙江省电力有限公司建设分公司 | Foundation structure of soft soil stratum and construction method thereof |
-
1996
- 1996-02-02 JP JP01749996A patent/JP3702435B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH09209371A (en) | 1997-08-12 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN101509261B (en) | Method for pile plate base for ultra-high voltage electric power line steel tower on soft foundation | |
JP2014224456A (en) | Shaft construction method and shaft structure on sloped ground | |
JP4664636B2 (en) | Monopile foundation construction method | |
JP3702435B2 (en) | How to build the foundation | |
CN207211158U (en) | Assembled pile board wall foundation pit supporting construction | |
JP2003147782A (en) | Foundation structure for constructing new building on existing basement and its construction method | |
CN101748735A (en) | Foundation ditch excavation method for reducing pile deflection in soft soil area | |
KR100360462B1 (en) | Method to construct a structure on soft soil and the structure thereof | |
JP2868651B2 (en) | Earth retaining method above existing underground structure | |
KR20080014176A (en) | Environmental affinity reinforcement soil retaining wall using a earth pressure reduction type environmental affinity block, and the construction method of this | |
CN103306291B (en) | Oblique pull concrete pile solid protection wide-angle abrupt slope device | |
JP3099040B2 (en) | Embankment culvert | |
JP2000160559A (en) | Landslide protection wall and construction method therefor | |
JP2874906B2 (en) | Shaft construction method | |
CN214143745U (en) | A side slope supporting construction for side slope ecological management | |
JP2004124452A (en) | Foundation pile structure in bearing ground and working method of foundation pile | |
JP7212981B1 (en) | Earth retaining structure and construction method of earth retaining structure | |
JP3206596U (en) | 塀 | |
JPS6018769B2 (en) | Construction method of underground structure | |
JPH01226935A (en) | Transmission line tower foundation and its construction | |
JPH04115024A (en) | Sheathing method | |
JP2797066B2 (en) | Solid foundation method with stabilizer | |
JP7014629B2 (en) | Building installation structure and installation method | |
JP2021173030A (en) | Steel sheet pile double structure in hard ground area and constructing method of steel sheet pile double structure | |
JPH09125347A (en) | Building method of dam |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20041221 |
|
A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20050221 |
|
A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20050322 |
|
A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20050420 |
|
RD02 | Notification of acceptance of power of attorney |
Free format text: JAPANESE INTERMEDIATE CODE: A7422 Effective date: 20050420 |
|
A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A821 Effective date: 20050421 |
|
A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20050517 |
|
A911 | Transfer of reconsideration by examiner before appeal (zenchi) |
Free format text: JAPANESE INTERMEDIATE CODE: A911 Effective date: 20050526 |
|
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: 20050621 |
|
A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20050708 |
|
R150 | Certificate of patent or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080729 Year of fee payment: 3 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110729 Year of fee payment: 6 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120729 Year of fee payment: 7 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120729 Year of fee payment: 7 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130729 Year of fee payment: 8 |
|
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 |
|
EXPY | Cancellation because of completion of term |