JP2000240088A - Construction method for footing - Google Patents
Construction method for footingInfo
- Publication number
- JP2000240088A JP2000240088A JP11041241A JP4124199A JP2000240088A JP 2000240088 A JP2000240088 A JP 2000240088A JP 11041241 A JP11041241 A JP 11041241A JP 4124199 A JP4124199 A JP 4124199A JP 2000240088 A JP2000240088 A JP 2000240088A
- Authority
- JP
- Japan
- Prior art keywords
- footing
- existing
- new
- adhesive
- pile
- 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
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、杭基礎で支持され
た既存構造物に不同沈下の修正や基礎免震を実施する際
に適用するに好適なフーチングの構築工法に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a footing suitable for use in correcting uneven settlement or seismic isolation of an existing structure supported by a pile foundation.
【０００２】[0002]
【従来の技術】従来、杭基礎で支持された既存構造物に
対して不同沈下の修正や基礎免震を実施する際には、次
の手順で施工されることが多い。2. Description of the Related Art Conventionally, in order to correct uneven settlement and seismic isolation of a foundation on an existing structure supported by a pile foundation, the construction is often performed in the following procedure.
【０００３】まず、建物基礎（既設フーチング）の下側
の土砂を掘削し、既設杭の一部を露出させた後、この既
設杭の露出部分を目荒らしする。次に、既設杭の周囲に
コンクリートを打設して新設フーチングを形成する。そ
の後、既設フーチングと新設フーチングとの間にサポー
トジャッキを挿入し、既設杭の露出部分を切断する。最
後に、既設フーチングと新設フーチングとの間にジャッ
キを介挿して所定の不同沈下修正作業を実施したり、既
設フーチングと新設フーチングとの間に免震装置を設置
して所定の基礎免震工事を行う。First, after excavating earth and sand below a building foundation (existing footing) to expose a part of the existing pile, the exposed portion of the existing pile is roughened. Next, concrete is cast around the existing pile to form a new footing. Thereafter, a support jack is inserted between the existing footing and the new footing, and the exposed portion of the existing pile is cut. Finally, a jack is inserted between the existing footing and the new footing to carry out the specified uneven settlement correction work, or a seismic isolation device is installed between the existing footing and the new footing to perform the specified base seismic isolation work. I do.
【０００４】[0004]
【発明が解決しようとする課題】しかし、これでは、ジ
ャッキや免震装置を支持する新設フーチングと既設杭と
の付着力が不十分であるため、これを補うべく新設フー
チングの厚さを増して付着面積を大きくする必要があ
る。その結果、新設フーチングの厚さの増大に伴って土
砂の掘削量が増え、それだけ工期が延びると同時に、コ
スト上昇を招くという不都合があった。However, in this case, the adhesion between the newly installed footing supporting the jack and the seismic isolation device and the existing pile is insufficient, and the thickness of the newly installed footing is increased to compensate for this. It is necessary to increase the adhesion area. As a result, the excavation amount of earth and sand increases along with the increase in the thickness of the newly-installed footing, which leads to an increase in the construction period and an increase in cost.
【０００５】本発明は、このような事情に鑑み、新設フ
ーチングを厚くすることなく既設杭との付着力を高める
ことにより、土砂の掘削量を減らし、工期短縮とコスト
削減を実現することが可能なフーチングの構築工法を提
供することを目的とする。In view of such circumstances, the present invention can reduce the amount of excavated earth and sand, and reduce the construction period and cost by increasing the adhesion to existing piles without increasing the thickness of newly installed footings. The purpose of the present invention is to provide a method of constructing a proper footing.
【０００６】[0006]
【課題を解決するための手段】本発明は、杭基礎で支持
された既存構造物に対してフーチングを新たに構築する
フーチングの構築工法であって、既設フーチングの下側
の土砂を掘削して既設杭の一部を露出させ、この既設杭
の露出部分の下部に接着剤を塗布し、その周囲にコンク
リートを打設して新設フーチングを形成し、次いで、こ
の新設フーチングと前記既設フーチングとの間にサポー
トジャッキを挿入し、この状態で前記既設杭の露出部分
の上部を切断するようにして構成される。ここで、接着
剤の塗布方法としては吹き付けやコテ塗り等が考えられ
る。SUMMARY OF THE INVENTION The present invention relates to a footing construction method for newly constructing a footing for an existing structure supported by a pile foundation, and excavating earth and sand below the existing footing. A part of the existing pile is exposed, an adhesive is applied to the lower part of the exposed part of the existing pile, concrete is cast around the area to form a new footing, and then the new footing and the existing footing are combined. A support jack is inserted in between, and in this state, the upper part of the exposed portion of the existing pile is cut off. Here, as a method of applying the adhesive, spraying, ironing, or the like can be considered.
【０００７】こうした構成を採用することにより、新設
フーチングと既設杭との接合部が接着剤で強固に固着さ
れ、その接合部を介して建物荷重が間接的に既設杭に伝
達されるように作用する。[0007] By adopting such a structure, the joint between the new footing and the existing pile is firmly fixed with an adhesive, and the building load is indirectly transmitted to the existing pile via the joint. I do.
【０００８】[0008]
【発明の実施の形態】以下、本発明の実施形態を図面に
基づいて説明する。Embodiments of the present invention will be described below with reference to the drawings.
【０００９】図１は本発明に係るフーチングの構築工法
の一実施形態を示す施工図、図２は荷重の伝達経路を示
す断面図である。FIG. 1 is a construction view showing an embodiment of a footing construction method according to the present invention, and FIG. 2 is a sectional view showing a load transmission path.
【００１０】このフーチングの構築工法を用いて、杭基
礎で支持された既存構造物に不同沈下の修正や基礎免震
を実施する際には、次の手順で施工する。When the footing construction method is used to correct uneven settlement or seismic isolation of an existing structure supported by a pile foundation, the construction is performed in the following procedure.
【００１１】まず、図１（ａ）に示すように、建物基礎
である既設フーチング１の下側の土砂を掘削し、複数本
（図１では２０本）の既設杭２の一部（上端部）を露出
させる。次に、これら既設杭２の露出部分に付着したゴ
ミをワイヤーブラシ等で落とし、その露出部分を水で洗
浄した後、図１（ｂ）に示すように、各既設杭２の露出
部分の下部（すなわち、フーチングを新たに形成しよう
とする部分）に接着剤３を均一な厚さで吹き付ける。First, as shown in FIG. 1 (a), the earth and sand below the existing footing 1 which is the foundation of the building is excavated, and a plurality (20 in FIG. 1) of the existing piles 2 (upper end portion) are excavated. ) To expose. Next, dust attached to the exposed portions of the existing piles 2 is removed with a wire brush or the like, and the exposed portions are washed with water. Then, as shown in FIG. The adhesive 3 is sprayed to a uniform thickness (that is, a portion where footing is to be newly formed).
【００１２】その直後（最長でも１週間以内）に、図１
（ｃ）に示すように、既設杭２の接着剤塗布部分の周囲
にコンクリートを打設して新設フーチング５を形成す
る。すると、新設フーチング５は、既設フーチング１と
の間に所定の空間を残したまま既設杭２に接着される。Immediately thereafter (at most within one week), FIG.
As shown in (c), a concrete footing 5 is formed by casting concrete around the adhesive applied portion of the existing pile 2. Then, the new footing 5 is bonded to the existing pile 2 while leaving a predetermined space between the new footing 5 and the existing footing 1.
【００１３】次いで、既設フーチング１と新設フーチン
グ５との間に複数本（図１では４本）のサポートジャッ
キ６を挿入して、既設フーチング１を一時的に支持す
る。この状態で、図１（ｄ）に示すように、すべての既
設杭２の露出部分の上部（すなわち、新設フーチング５
から上向きに突出した部分）を切断する。Next, a plurality of (four in FIG. 1) support jacks 6 are inserted between the existing footing 1 and the new footing 5 to temporarily support the existing footing 1. In this state, as shown in FIG. 1D, the upper part of the exposed portion of all the existing piles 2 (that is, the new footing 5
(The part projecting upwards from).
【００１４】最後に、既設フーチング１と新設フーチン
グ５との間にジャッキ（図示せず）を介挿して所定の不
同沈下修正作業を実施したり、既設フーチング１と新設
フーチング５との間に免震装置（図示せず）を設置して
所定の基礎免震工事を行った後、サポートジャッキ６を
すべて撤去する。Finally, a jack (not shown) is inserted between the existing footing 1 and the new footing 5 to perform a predetermined uneven settlement correction operation, or a work is performed between the existing footing 1 and the new footing 5. After installing a seismic device (not shown) and performing a predetermined base seismic isolation work, all the support jacks 6 are removed.
【００１５】ここで不同沈下修正作業あるいは基礎免震
工事が終了するが、このジャッキや免震装置を介して下
向きに伝わる建物荷重Ｗは、各既設杭２に直接伝達され
るのではなく、図２に示すように、いったん新設フーチ
ング５に伝えられてから、新設フーチング５と既設杭２
との接合部を介して間接的に各既設杭２に伝達される。
この際、新設フーチング５と既設杭２との接合部には接
着剤３が介在しており、両者間の付着力は十分に大きい
ので、新設フーチング５を厚くする必要はない。したが
って、土砂の掘削量が少なくて済み、工期が短縮される
と同時に、コストが削減されることになる。At this point, the uneven settlement correction work or the base seismic isolation work is completed. However, the building load W transmitted downward through the jack and the seismic isolation device is not directly transmitted to each of the existing piles 2 but is shown in FIG. As shown in Fig. 2, once transmitted to the new footing 5, the new footing 5 and the existing pile 2
Is indirectly transmitted to each existing pile 2 via the joint with the existing pile 2.
At this time, the adhesive 3 is interposed at the joint between the newly installed footing 5 and the existing pile 2, and the adhesive force between the two is sufficiently large. Therefore, it is not necessary to make the newly installed footing 5 thick. Therefore, the amount of excavation of earth and sand is small, and the construction period is shortened, and at the same time, the cost is reduced.
【００１６】なお、上述の実施形態においては既設杭２
に接着剤３を吹き付けて塗布する場合について説明した
が、接着剤３の塗布方法はこれに限られず、例えば接着
剤３をコテ塗りして塗布するようにしてもよい。In the above embodiment, the existing pile 2
Although the case where the adhesive 3 is applied by spraying the adhesive 3 has been described, the method of applying the adhesive 3 is not limited to this, and for example, the adhesive 3 may be applied by ironing.
【００１７】[0017]
【発明の効果】以上説明したように、本発明によれば、
杭基礎で支持された既存構造物に対してフーチングを新
たに構築するフーチングの構築工法であって、既設フー
チングの下側の土砂を掘削して既設杭の一部を露出さ
せ、この既設杭の露出部分の下部に接着剤を塗布し、そ
の周囲にコンクリートを打設して新設フーチングを形成
し、次いで、この新設フーチングと前記既設フーチング
との間にサポートジャッキを挿入し、この状態で前記既
設杭の露出部分の上部を切断するようにして構成したの
で、新設フーチングと既設杭との接合部が接着剤で強固
に固着され、その接合部を介して建物荷重が間接的に既
設杭に伝達されることから、新設フーチングを厚くする
ことなく既設杭との付着力を高めることができる。その
結果、土砂の掘削量が減少し、産業廃棄物となる現地発
生土を減らすことができると同時に、工期短縮およびコ
スト削減を図ることが可能となる。また、既設杭の大部
分を有効に利用できるので、省資源につながる。さら
に、施工が簡単であるため、実用性も高い。As described above, according to the present invention,
This is a footing construction method for newly constructing a footing for an existing structure supported by a pile foundation, excavating the soil below the existing footing to expose a part of the existing pile, An adhesive is applied to the lower portion of the exposed portion, concrete is cast around the exposed portion to form a new footing, and then a support jack is inserted between the new footing and the existing footing. Since the upper part of the exposed part of the pile is cut off, the joint between the new footing and the existing pile is firmly fixed with adhesive, and the building load is indirectly transmitted to the existing pile via the joint Therefore, it is possible to increase the adhesive force with the existing pile without increasing the thickness of the newly installed footing. As a result, the amount of excavated earth and sand is reduced, and the amount of locally generated soil that becomes industrial waste can be reduced, and at the same time, it is possible to shorten the construction period and reduce costs. Also, most of the existing piles can be used effectively, leading to resource saving. Furthermore, since the construction is simple, the utility is high.
【図１】本発明に係るフーチングの構築工法の一実施形
態を示す施工図である。FIG. 1 is a construction diagram showing an embodiment of a footing construction method according to the present invention.
【図２】荷重の伝達経路を示す断面図である。FIG. 2 is a sectional view showing a load transmission path.
１……既設フーチング ２……既設杭 ３……接着剤 ５……新設フーチング ６……サポートジャッキ 1 ... existing footing 2 ... existing pile 3 ... adhesive 5 ... new footing 6 ... support jack
フロントページの続き (72)発明者 小林 淳 東京都新宿区西新宿一丁目25番１号 大成 建設株式会社内 (72)発明者 福島 順一 東京都新宿区西新宿一丁目25番１号 大成 建設株式会社内Continuing from the front page (72) Inventor Jun Kobayashi Taisei Construction Co., Ltd. 1-25-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo (72) Inventor Junichi Fukushima 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo In company
Claims (1)
フーチングを新たに構築するフーチングの構築工法であ
って、 既設フーチングの下側の土砂を掘削して既設杭の一部を
露出させ、この既設杭の露出部分の下部に接着剤を塗布
し、その周囲にコンクリートを打設して新設フーチング
を形成し、次いで、この新設フーチングと前記既設フー
チングとの間にサポートジャッキを挿入し、この状態で
前記既設杭の露出部分の上部を切断するようにしたこと
を特徴とするフーチングの構築工法。A footing construction method for newly constructing a footing for an existing structure supported by a pile foundation, excavating earth and sand below the existing footing to expose a part of the existing pile. Applying an adhesive to the lower part of the exposed part of the existing pile, casting concrete around it to form a new footing, and then inserting a support jack between the new footing and the existing footing, In this state, an upper portion of the exposed portion of the existing pile is cut off, and a footing construction method is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04124199A JP3395692B2 (en) | 1999-02-19 | 1999-02-19 | Foundation and its construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04124199A JP3395692B2 (en) | 1999-02-19 | 1999-02-19 | Foundation and its construction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000240088A true JP2000240088A (en) | 2000-09-05 |
| JP3395692B2 JP3395692B2 (en) | 2003-04-14 |
Family
ID=12602946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04124199A Expired - Fee Related JP3395692B2 (en) | 1999-02-19 | 1999-02-19 | Foundation and its construction method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3395692B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006002354A (en) * | 2004-06-15 | 2006-01-05 | Ohbayashi Corp | Base isolation reinforcing method adding rocking function to existing foundation |
| KR100819379B1 (en) * | 2007-08-17 | 2008-04-04 | 이학곤 | Concrete construction using hydraulic system and anti-noise non-vibration manufacturing method of concrete construction |
| CN102535534A (en) * | 2012-01-05 | 2012-07-04 | 江苏海上龙源风力发电有限公司 | Construction process for leveling and grouting intertidal zone polygonal bracket fan foundation |
| JP2017179904A (en) * | 2016-03-30 | 2017-10-05 | 株式会社熊谷組 | Support structure of structure and reinforcement method of pile foundation structure |
-
1999
- 1999-02-19 JP JP04124199A patent/JP3395692B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006002354A (en) * | 2004-06-15 | 2006-01-05 | Ohbayashi Corp | Base isolation reinforcing method adding rocking function to existing foundation |
| JP4586430B2 (en) * | 2004-06-15 | 2010-11-24 | 株式会社大林組 | Seismic isolation method to add rocking function to existing foundation |
| KR100819379B1 (en) * | 2007-08-17 | 2008-04-04 | 이학곤 | Concrete construction using hydraulic system and anti-noise non-vibration manufacturing method of concrete construction |
| CN102535534A (en) * | 2012-01-05 | 2012-07-04 | 江苏海上龙源风力发电有限公司 | Construction process for leveling and grouting intertidal zone polygonal bracket fan foundation |
| JP2017179904A (en) * | 2016-03-30 | 2017-10-05 | 株式会社熊谷組 | Support structure of structure and reinforcement method of pile foundation structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3395692B2 (en) | 2003-04-14 |
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