JP2002146809A - Construction method for structure - Google Patents
Construction method for structureInfo
- Publication number
- JP2002146809A JP2002146809A JP2000339363A JP2000339363A JP2002146809A JP 2002146809 A JP2002146809 A JP 2002146809A JP 2000339363 A JP2000339363 A JP 2000339363A JP 2000339363 A JP2000339363 A JP 2000339363A JP 2002146809 A JP2002146809 A JP 2002146809A
- Authority
- JP
- Japan
- Prior art keywords
- foundation
- existing
- pile
- mat
- existing 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.)
- Pending
Links
Landscapes
- Foundations (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、撤去した既存構
造物の下に残る既存杭を利用して新設の構造物を構築す
る方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a new structure using existing piles remaining under a removed existing structure.
【０００２】[0002]
【従来の技術】杭で支持された構造物を解体，撤去して
新たな構造物を構築する場合として次の方法が実施され
又は考えられている。 既存杭の存在を無視して新設の杭を施工し、これを
杭基礎として新設構造物を構築する。 既存杭を解体し、構造物を支持するのに必要な新設
の杭を施工し、これを杭基礎として新設構造物を構築す
る。 既存杭の健全性や支持能力を詳細に調査した後、既
存杭のみで新たな構造物を安全に支持できる場合には既
存杭のみを使用し、既存杭のみでは安全性に不安がある
場合には新設杭を施工して、これを既存杭と併用する。 直接基礎（すなわち杭基礎を使用しないで構造物の
垂直荷重及び水平荷重を地盤に直接支持させる基礎）に
しても構造物を安全に支持できる深さまで地盤を掘削
し、既設杭を撤去したうえ、その地盤上に構造物を直接
構築する。2. Description of the Related Art The following method has been implemented or considered when a structure supported by a pile is dismantled and removed to construct a new structure. A new pile will be constructed ignoring the existing piles, and a new structure will be constructed using this as the pile foundation. Dismantle existing piles, construct new piles necessary to support the structure, and construct a new structure using this as the pile foundation. After investigating the soundness and supporting capacity of the existing piles in detail, use the existing piles only if the existing piles can safely support the new structure. Will construct a new pile and use it together with the existing pile. Excavating the ground to a depth that can safely support the structure even with a direct foundation (that is, a foundation that supports the vertical and horizontal loads of the structure directly on the ground without using a pile foundation), removing the existing piles, Build structures directly on the ground.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、前記
の場合はいずれも構造物の垂直荷重の全てを杭で支
持させるものであって、新たな杭の施工はコスト高にな
るという不具合がある。また、既存杭の全て又は一部を
利用する杭基礎であっても杭の健全性や支持能力の調査
によりこれもコスト高になるという不具合がある。However, in all of the above cases, the entire vertical load of the structure is supported by the piles, and there is a problem that the construction of a new pile increases the cost. Further, even if the pile foundation uses all or a part of the existing pile, there is a problem that the cost is increased due to the investigation of the soundness and the supporting capacity of the pile.
【０００４】また、前記の場合は、既存杭の存在を無
視して、構造物の垂直荷重の全てを地盤で直接支持させ
るものであるため、杭の撤去や撤去部位の埋め戻しにコ
ストがかかるという不具合がある。この発明は、既存の
構造物を解体，撤去して新たな構造物を構築する際の前
記不具合を解決して、既存杭を再利用することによりコ
ストの軽減を図ることを目的してなされたものである。In addition, in the above case, the entire vertical load of the structure is directly supported by the ground, ignoring the existence of the existing piles, so that it is costly to remove the piles and backfill the removed parts. There is a problem that. SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problem in dismantling and removing an existing structure and constructing a new structure, and to reduce costs by reusing existing piles. Things.
【０００５】[0005]
【課題を解決するための手段】請求項１に記載の発明
は、既存杭で支持された既存構造物を、前記既存杭を残
して撤去する工程と、既存杭の上側にマット基礎を設け
てこのマット基礎を前記既存杭と直接基礎との両方に支
持させる工程と、前記マット基礎上に新設構造物を構築
する工程とからなる構造物の構築方法である。この発明
で用いるマット基礎としては、必ずしも上面が平坦であ
る必要はないし、上面に基礎梁などの突起物があっても
よい。要は、構造物の垂直荷重を下側の地盤及び杭に直
接伝達するために十分な強度を備えたスラブであればよ
い。According to the first aspect of the present invention, an existing structure supported by an existing pile is removed while leaving the existing pile, and a mat foundation is provided above the existing pile. This is a method for constructing a structure, comprising: a step of supporting the mat foundation both on the existing pile and the direct foundation; and a step of constructing a new structure on the mat foundation. The mat base used in the present invention does not necessarily need to have a flat upper surface, and may have a projection such as a foundation beam on the upper surface. In short, a slab having sufficient strength to directly transmit the vertical load of the structure to the lower ground and piles may be used.
【０００６】この発明によれば、既存杭を再利用するこ
とにより、既存杭の撤去や埋め戻しのコスト、新設杭の
施工のコストをいずれも不要ないし低減させるととも
に、新設構築物の垂直荷重を前記杭基礎と直接基礎によ
り支持するから、荷重を十分に支持することができる効
果がある。また、マット基礎を用いるから、杭基礎の位
置が新設構造物の柱の下の位置に一致しなくとも十分に
新設構造物の荷重を杭基礎に伝達することができる。こ
のため、杭基礎の位置に拘束されることなく柱の位置を
任意に設計することができる。According to the present invention, by reusing the existing piles, the cost of removing and backfilling the existing piles and the cost of constructing the new piles are both unnecessary or reduced, and the vertical load of the new construction is reduced. Since the foundation is directly supported by the pile foundation and the foundation, there is an effect that the load can be sufficiently supported. Further, since the mat foundation is used, the load of the new structure can be sufficiently transmitted to the pile foundation even if the position of the pile foundation does not coincide with the position under the column of the new structure. Therefore, the position of the pillar can be arbitrarily designed without being restricted by the position of the pile foundation.
【０００７】請求項２に記載の発明は、請求項１の、前
記既存杭の上側にマット基礎を設けてこのマット基礎を
前記既存杭と直接基礎との両方に支持させる工程に代え
て、前記既存杭の上側に、複数のフーチングとフーチン
グどうしを連結する地中梁とからなる基礎構造体を設け
て、この基礎構造体を前記既存杭と直接基礎との両方に
支持させる工程としたものであり、前記基礎構造体の上
に新設構造物を構築するものとした。According to a second aspect of the present invention, in place of the step of providing a mat foundation above the existing pile and supporting the mat foundation both on the existing pile and directly on the foundation according to the first aspect, On the upper side of the existing pile, a foundation structure comprising a plurality of footings and an underground beam connecting the footings is provided, and the foundation structure is supported by both the existing piles and the direct foundation. Yes, a new structure is to be constructed on the basic structure.
【０００８】この発明によれば、請求項１に記載の発明
と同様にコストが有利であり且つ新設構造物の荷重を十
分に支持することができる。また、フーチングと基礎梁
とからなる基礎構造体が杭基礎と直接基礎によって支持
されるから、基礎梁を杭基礎の上に施工することにより
柱を基礎梁の上に施工しなくとも十分に新設構造物の荷
重を杭基礎に伝達することができる。このため、この発
明においても、杭基礎の位置に拘束されることなく柱の
位置を任意に設計することができる。According to the present invention, as in the first aspect, the cost is advantageous and the load of the new structure can be sufficiently supported. In addition, since the foundation structure consisting of the footing and the foundation beam is supported by the pile foundation and the direct foundation, the foundation beam is constructed on the pile foundation, so that it is not necessary to construct columns on the foundation beam. The load of the structure can be transmitted to the pile foundation. Therefore, also in the present invention, the position of the pillar can be arbitrarily designed without being restricted by the position of the pile foundation.
【０００９】また、請求項３に記載の発明は、請求項１
の発明において、さらに、前記既存杭の上側に、砂利，
砕石，改良土の一又は複数からなる敷設材を所定厚敷設
し、その上に前記基礎スラブを設ける方法である。この
発明によれば、新設構造物のマット基礎の底面が、撤去
する既存構造物の基礎スラブの底面より浅くなる場合
に、前記敷設材を介して新設構造物の荷重を既存杭と直
接基礎とにより支持することができる。[0009] The invention described in claim 3 is based on claim 1.
In the invention of the above, further, gravel,
This is a method in which a laying material composed of one or more of crushed stone and improved soil is laid with a predetermined thickness, and the base slab is provided thereon. According to the present invention, when the bottom surface of the mat foundation of the new structure is shallower than the bottom surface of the foundation slab of the existing structure to be removed, the load of the new structure is directly connected to the existing pile and the foundation via the laying material. Can be supported.
【００１０】また、請求項４に記載の発明は、請求項
１，３のいずれかの発明において、さらに、前記既存杭
の上側にゴム質の材料を敷設し、その上に前記マット基
礎を設ける方法である。この発明によれば、新設構築物
の荷重が既存の複数の杭基礎どうしの間、或いはこれら
と直接基礎との間で負担する荷重が均等化される。ま
た、請求項５に記載の発明は、請求項１，３，４のいず
れかにおいて、さらに、前記マット基礎を設ける前に、
既存構造物のあった地盤を良好な土質が表れる深さまで
掘削する工程と、前記掘削により露出した既存杭の上部
を解体する工程とを含む方法である。既存杭の残部の上
側と掘削地盤の上側に前記マット基礎を設けるものであ
る。According to a fourth aspect of the present invention, in any one of the first and third aspects of the present invention, a rubber material is further laid on the upper side of the existing pile, and the mat base is provided thereon. Is the way. ADVANTAGE OF THE INVENTION According to this invention, the load which the load of a new construction bears between several existing pile foundations or between these and a direct foundation is equalized. According to a fifth aspect of the present invention, in any one of the first, third and fourth aspects, before the mat foundation is provided,
The method includes a step of excavating the ground having the existing structure to a depth at which good soil quality appears, and a step of dismantling an upper part of the existing pile exposed by the excavation. The mat foundation is provided above the remaining portion of the existing pile and above the excavated ground.
【００１１】この発明によれば、既存杭の杭頭付近の地
盤が新設構造物を支持するのに適当でない場合や、新設
構造物のマット基礎底面を既存構造物の基礎スラブ底面
より深くする必要がある場合に最適となる方法である。
さらに請求項６に記載の発明は、請求項１，３，４，５
のいずれかにおいて、さらに、前記マット基礎を支持す
る杭として前記既存杭とは別に新設杭を設けて、既存及
び新設の両杭基礎と直接基礎とで前記マット基礎を支持
させるものである。According to the present invention, when the ground near the pile head of the existing pile is not suitable for supporting the new structure, it is necessary to make the mat base bottom of the new structure deeper than the base slab bottom of the existing structure. This is the best method when there is.
Further, the invention according to claim 6 is based on claims 1, 3, 4, 5
In any of the above, a new pile is provided separately from the existing pile as a pile for supporting the mat foundation, and the mat foundation is supported by both the existing and the new pile foundation and the direct foundation.
【００１２】この発明によれば、杭による荷重支持力が
新設杭の分だけ増大するから、撤去する既存構造物より
も重量の大な、例えば既存構造物より高層の新設構造物
を構築することができる。なお、請求項２の発明に対し
ても請求項３〜請求項６に記載のものを適用することが
できる。この場合には、請求項３〜請求項６におけるマ
ット基礎を基礎構造体と読み換えるものとする。According to the present invention, since the load bearing capacity of the pile is increased by the amount of the new pile, it is possible to construct a new structure that is heavier than the existing structure to be removed, for example, is higher than the existing structure. Can be. In addition, what is described in claim 3 to claim 6 can be applied to the invention of claim 2. In this case, the mat foundation in claims 3 to 6 should be read as a foundation structure.
【００１３】[0013]
【発明の実施の形態】図１〜図６はこの発明の一実施形
態の各工程の順序を示す図であり、図１は、既存構造物
１が地盤２中の既存杭３に支持されている状態を示す縦
断面図であり、既存構造物１の柱４の下に形成されたフ
ーチング５を介して前記既存杭３が既存構造物１を支持
している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 6 are diagrams showing the sequence of each step of an embodiment of the present invention. FIG. 1 shows an existing structure 1 supported by an existing pile 3 in a ground 2. FIG. 4 is a longitudinal sectional view showing a state in which the existing structure 1 is supported by the existing pile 3 via a footing 5 formed below a pillar 4 of the existing structure 1.
【００１４】次に、図２に示すように、既存杭３を残し
て前記既存構造物１をフーチング５まで解体して撤去し
たうえ、地盤２を良好な土質が表れるまで、或いは地下
室などを形成するために必要な深さまで掘削する。この
状態では既存杭３は杭頭３ａが掘削後の地盤表面２ａか
ら突出した状態にある。ＧＬは地表を示す。次に、図３
に示すように、露出した杭頭３ａを解体撤去して、掘削
した地盤表面２ａと既存杭３の上端とを同一レベルにす
る。ここで同一レベルとは、後述のようにマット基礎を
杭基礎と直接基礎に支持できるレベルであれば、地盤表
面２ａと既存杭３の上端とは、或る程度の上下があって
もよいことを意味する。Next, as shown in FIG. 2, the existing structure 1 is dismantled and removed to the footing 5 while leaving the existing pile 3, and the ground 2 is formed until a good soil quality appears or a basement is formed. Drill to the required depth to do so. In this state, the existing pile 3 has a pile head 3a protruding from the ground surface 2a after excavation. GL indicates the ground surface. Next, FIG.
As shown in (2), the exposed pile head 3a is dismantled and removed, and the excavated ground surface 2a and the upper end of the existing pile 3 are set at the same level. Here, the same level means that the ground surface 2a and the upper end of the existing pile 3 may have a certain degree of elevation as long as the mat foundation can be directly supported on the pile foundation and the foundation as described later. Means
【００１５】次に、図４に示すように、既存杭３と掘削
した地盤表面２ａの上にマット基礎６を構築する。ここ
でのマット基礎６は厚い鉄筋コンクリートスラブからな
り、以て既存杭３と地盤表面２ａに支持されて杭基礎と
直接基礎の併用となっている。この実施形態のマット基
礎６は上面が平坦になっていて、この上に形成される室
の使い勝手がよいが、マット基礎としての強度があれ
ば、換言すれば耐圧版としての機能があれば必ずしも平
坦なものでなくともよく、基礎梁などが上面から突出す
るものであってもよい。Next, as shown in FIG. 4, a mat foundation 6 is constructed on the existing pile 3 and the excavated ground surface 2a. The mat foundation 6 here is made of a thick reinforced concrete slab, and is supported by the existing pile 3 and the ground surface 2a, so that the pile foundation and the direct foundation are used together. The mat foundation 6 of this embodiment has a flat upper surface, and the chamber formed thereon is easy to use. However, if the mat foundation has strength, in other words, if it has a function as a pressure-resistant plate, it is not necessarily required. The base beam does not have to be flat, and a foundation beam or the like may protrude from the upper surface.
【００１６】次に、図５に示すように、マット基礎６の
上に新設の構造物７を構築する。図５の構造物７は構築
途中を示している。この構造物７は柱８や壁などの垂直
荷重を支持する部位がマット基礎６に支持され、マット
基礎６が杭基礎と直接基礎とに支持されているから、既
存杭３の位置に合わせて柱８などの垂直荷重を支持する
部位の位置を設定する必要がない。すなわち、構造物７
の垂直荷重はマット基礎６に支持され、マット基礎６に
負荷された垂直荷重は主として既存杭３に支持されると
ともに、荷重の残部が直接地盤２に支持されることにな
る。Next, as shown in FIG. 5, a new structure 7 is constructed on the mat foundation 6. The structure 7 in FIG. 5 shows a state during construction. In this structure 7, a portion supporting vertical loads such as columns 8 and walls is supported by a mat foundation 6, and the mat foundation 6 is supported by a pile foundation and a direct foundation. There is no need to set the position of a portion supporting the vertical load such as the column 8. That is, the structure 7
Is supported by the mat foundation 6, and the vertical load applied to the mat foundation 6 is mainly supported by the existing pile 3, and the rest of the load is directly supported by the ground 2.
【００１７】かくして、構造物７の垂直荷重はマット基
礎６を介して杭基礎と直接基礎とによって支持されるか
ら、垂直荷重の十分な支持力を得ることができるため、
図６に示すように、図１の既存の構造物１に比較して荷
重の大な（例えば高層の）新設の構造物７とすることが
できる。図６において、下向きの白矢印は構造物７の垂
直荷重を示し、上向きの白矢印は既存杭３の支持力（垂
直荷重に対する反力）を示し、また上向きの黒矢印は地
盤２の支持力（垂直荷重に対する反力）を示している。Thus, since the vertical load of the structure 7 is supported by the pile foundation and the direct foundation via the mat foundation 6, a sufficient supporting force for the vertical load can be obtained.
As shown in FIG. 6, a new structure 7 having a larger load (for example, a high-rise building) than the existing structure 1 in FIG. 1 can be used. In FIG. 6, the downward white arrow indicates the vertical load of the structure 7, the upward white arrow indicates the supporting force of the existing pile 3 (reaction force against the vertical load), and the upward black arrow indicates the supporting force of the ground 2. (Reaction force against vertical load).
【００１８】以上の図１〜図６に示した手順の実施形態
では、図２に示す工程で地盤２を所定の深さまで掘削し
たが、この掘削は必ずしも必要なものではない。また、
既存杭３の上端と地盤２の表面にマット基礎６を直接支
持させた形態を示したが、既存杭３の上端及び地盤２の
表面とマット基礎６との間に、図７に示すように、砂
利，砕石，改良土の一又は複数からなる敷設材の層９を
介在させてもよい。この敷設材の層９は、砂利又は砕石
の層でもよいし、改良土の層でもよい。また、この敷設
材の層９としては、前記砂利，砕石，改良土の層と併せ
て、又は単独でゴム質の材料の層としてもよい。このゴ
ム質の材料の層としては、所定厚みの合成ゴムを敷設す
ることが典型的な例であるが、かかる層を用いることに
より、地盤及び／又は既存杭３の一部に構造物７の荷重
が偏ることを防止することができる。図７の場合は、図
１〜図６に示した工程と同様に地盤２を掘削し、その掘
削した地盤２の表面に前記層９を形成したが、地盤２を
掘削することなく、既存の構造物１の地盤よりも浅い位
置にマット基礎６を形成する場合にも、前記の層９を形
成することは有効である。In the above embodiment of the procedure shown in FIGS. 1 to 6, the ground 2 is excavated to a predetermined depth in the step shown in FIG. 2, but this excavation is not always necessary. Also,
Although the form in which the mat foundation 6 is directly supported on the upper end of the existing pile 3 and the surface of the ground 2 is shown, between the upper end of the existing pile 3 and the surface of the ground 2 and the mat foundation 6, as shown in FIG. A layer 9 of a laying material composed of one or more of gravel, crushed stone, and improved soil may be interposed. The layer 9 of the laying material may be a layer of gravel or crushed stone, or a layer of improved soil. The layer 9 of the laying material may be a layer of a rubber material together with the layer of the gravel, crushed stone, and the improved soil, or alone. As a layer of this rubber material, it is typical to lay a synthetic rubber having a predetermined thickness. However, by using such a layer, the structure 7 can be formed on the ground and / or a part of the existing pile 3. Unbalanced load can be prevented. In the case of FIG. 7, the ground 2 was excavated in the same manner as the process shown in FIGS. 1 to 6, and the layer 9 was formed on the surface of the excavated ground 2. Even when the mat foundation 6 is formed at a position shallower than the ground of the structure 1, it is effective to form the layer 9 described above.
【００１９】さらに、前記の実施の形態では、杭基礎と
して既存杭３のみを使用したが、新設の構造物７の荷重
によっては、既存杭３に加えて新設杭を設けることによ
り、さらに支持力を増大することができるのは勿論であ
る。また、前記の実施の形態では、構造物７として鉄筋
コンクリート造や鉄骨造のオフィスビルや集合住宅等を
図示したが、この発明は、杭基礎を必要とする全ての構
造物の構築方法について適用できることもまた勿論であ
る。Further, in the above-described embodiment, only the existing pile 3 is used as the pile foundation. However, depending on the load of the newly constructed structure 7, by providing the new pile in addition to the existing pile 3, the bearing capacity can be further increased. Can of course be increased. In the above-described embodiment, the structure 7 is a reinforced concrete or steel-frame office building, an apartment house, or the like. However, the present invention can be applied to a method of constructing all structures requiring a pile foundation. Of course.
【００２０】なお、以上の各実施形態は、マット基礎を
用いた場合の構築方法について説明したが、マット基礎
に代えて、複数のフーチングとフーチングどうしを連結
する地中梁とからなる基礎構造体を設けてもよい。この
場合は基礎構造体上に新設構造物を構築するものとし、
また当該基礎構造体を杭基礎及び直接基礎により支持す
るものとする。In each of the embodiments described above, the construction method using the mat foundation has been described. However, instead of the mat foundation, a foundation structure comprising a plurality of footings and an underground beam for connecting the footings is provided. May be provided. In this case, a new structure shall be built on the foundation structure,
In addition, the foundation structure shall be supported by a pile foundation and a direct foundation.
【００２１】[0021]
【発明の効果】以上説明したように、請求項１に記載の
発明によれば、既存杭を再利用することにより、既存杭
の撤去や埋め戻しのコスト、新設杭の施工のコストをい
ずれも不要ないし低減させるとともに、新設構築物の垂
直荷重を前記杭基礎と直接基礎により支持するから、工
期を短縮することができるとともに構築物の荷重を十分
に支持することができる効果がある。また、マット基礎
を用いるから、杭基礎の位置が新設構造物の柱の下の位
置に一致しなくとも十分に新設構造物の荷重を杭基礎に
伝達することができる。このため、杭基礎の位置に拘束
されることなく柱の位置を任意に設計することができ
る。As described above, according to the first aspect of the present invention, the cost of removing and backfilling existing piles and the cost of constructing new piles can be reduced by reusing existing piles. Since it is unnecessary or reduced and the vertical load of the new construction is supported by the pile foundation and the direct foundation, the construction period can be shortened and the load of the construction can be sufficiently supported. Further, since the mat foundation is used, the load of the new structure can be sufficiently transmitted to the pile foundation even if the position of the pile foundation does not coincide with the position under the column of the new structure. Therefore, the position of the pillar can be arbitrarily designed without being restricted by the position of the pile foundation.
【００２２】また、請求項２に記載の発明によれば、複
数のフーチングとフーチングどうしを連結する地中梁と
からなる基礎構造体を既存杭と直接基礎との両方に支持
させるから、請求項１の発明と同様に荷重を十分に支持
することができる効果がある。また、前記基礎構造体を
用いるから、杭基礎の位置が新設構造物の柱の下の位置
に一致しなくとも十分に新設構造物の荷重を杭基礎に伝
達することができる効果がある。According to the second aspect of the present invention, a foundation structure including a plurality of footings and an underground beam connecting the footings is supported on both the existing pile and the direct foundation. As in the first invention, there is an effect that the load can be sufficiently supported. Further, since the foundation structure is used, there is an effect that the load of the new structure can be sufficiently transmitted to the pile foundation even if the position of the pile foundation does not coincide with the position under the column of the new structure.
【００２３】また、請求項３に記載の発明によれば、請
求項１の発明の効果に加えて、新設構造物のマット基礎
の底面が、撤去する既存構造物の基礎スラブの底面より
浅くなる場合に、前記敷設材を介して新設構造物の荷重
を既存杭と直接基礎とにより支持することができる効果
がある。なお、新設構造物のマット基礎底面が既存構造
物の基礎スラブ底面より深い場合でも前記敷設材の層を
設けることも可能であまた、請求項４に記載の発明によ
れば、請求項１，３のいずれかの発明の効果に加えて、
新設構築物の荷重が既存の複数の杭基礎どうしの間、或
いはこれらと直接基礎との間で負担する荷重が均等化さ
れる効果がある。According to the third aspect of the present invention, in addition to the effect of the first aspect, the bottom surface of the mat foundation of the new structure is shallower than the bottom surface of the foundation slab of the existing structure to be removed. In this case, there is an effect that the load of the new structure can be supported by the existing pile and the foundation directly via the laying material. In addition, even when the mat base bottom of the new structure is deeper than the base slab bottom of the existing structure, the layer of the laying material can be provided. In addition to the effects of any of the inventions,
There is an effect that the load of the new construction is equalized between the plurality of existing pile foundations or between these and the direct foundation.
【００２４】また、請求項５に記載の発明によれば、請
求項１，３，４のいずれかの発明の効果に加えて、既存
杭の杭頭付近の地盤が新設構造物を支持するのに適当で
ない場合や、新設構造物のマット基礎底面を既存構造物
の基礎スラブ底面より深くする必要がある場合に最適と
なる方法である。さらに請求項６に記載の発明によれ
ば、請求項１，３，４，５のいずれかの発明の効果に加
えて、さらに、杭による荷重支持力が新設杭の分だけ増
大するから、撤去する既存構造物よりも重量の大な、例
えば既存構造物より高層の新設構造物を構築することが
できる効果がある。According to the fifth aspect of the present invention, in addition to the effects of any one of the first, third and fourth aspects, the ground near the pile head of the existing pile supports the new structure. This method is optimal in cases where it is not appropriate for the above, or when it is necessary to make the mat foundation bottom of the new structure deeper than the foundation slab bottom of the existing structure. According to the invention described in claim 6, in addition to the effect of any one of claims 1, 3, 4, and 5, the load supporting force of the pile is increased by the amount of the newly installed pile, so that the pile is removed. There is an effect that it is possible to construct a new structure that is heavier than the existing structure, for example, higher in height than the existing structure.
【図１】既存構造物と既存杭との関係を示す断面図。FIG. 1 is a sectional view showing a relationship between an existing structure and an existing pile.
【図２】既存構造物を解体撤去し地盤を掘削した状態の
断面図。FIG. 2 is a cross-sectional view of a state where an existing structure has been dismantled and removed and the ground has been excavated.
【図３】既存杭の杭頭を解体撤去した状態を示す断面
図。FIG. 3 is a sectional view showing a state where a pile head of an existing pile is dismantled and removed.
【図４】既存杭と地盤表面にマット基礎を形成した状態
の断面図。FIG. 4 is a sectional view showing a state in which a mat foundation is formed on an existing pile and the ground surface.
【図５】マット基礎上に新設の構造体を構築中の状態の
断面図。FIG. 5 is a cross-sectional view showing a state where a new structure is being constructed on a mat foundation.
【図６】新設の構造体が完成した状態の断面図。FIG. 6 is a cross-sectional view showing a state in which a newly installed structure is completed.
【図７】別の実施形態を示す断面図。FIG. 7 is a cross-sectional view showing another embodiment.
１ 既存の構造物 ２ 地盤 ３ 既存杭 ３ａ 既存杭の杭頭 ４ 柱 ５ フーチング ６ マット基礎 ７ 新設の構造物 ８ 柱や壁 ９ 敷設材の層 DESCRIPTION OF SYMBOLS 1 Existing structure 2 Ground 3 Existing pile 3a Pile head of existing pile 4 Column 5 Footing 6 Mat foundation 7 New structure 8 Column and wall 9 Layer of laying material
Claims (6)
既存杭を残して撤去する工程と、既存杭の上側にマット
基礎を設けてこのマット基礎を前記既存杭と直接基礎と
の両方に支持させる工程と、前記マット基礎上に新設構
造物を構築する工程とからなる構造物の構築方法。1. A step of removing an existing structure supported by an existing pile while leaving the existing pile, and providing a mat foundation on an upper side of the existing pile and using the mat foundation as both the existing pile and a direct foundation. And a step of constructing a new structure on the mat foundation.
既存杭を残して撤去する工程と、前記既存杭の上側に、
複数のフーチングとフーチングどうしを連結する地中梁
とからなる基礎構造体を設けて、この基礎構造体を前記
既存杭と直接基礎との両方に支持させる工程と、前記基
礎構造体の上に新設構造物を構築する工程とからなる構
造物の構築方法。2. A step of removing an existing structure supported by an existing pile while leaving the existing pile,
Providing a foundation structure including a plurality of footings and an underground beam connecting the footings, and supporting the foundation structure on both the existing pile and the direct foundation; and And a step of constructing the structure.
土の一又は複数からなる敷設材を所定厚敷設し、その上
に前記マット基礎を設ける請求項１に記載の構造物の構
築方法。3. The construction of the structure according to claim 1, wherein a laying material composed of one or more of gravel, crushed stone, and improved soil is laid at a predetermined thickness above the existing pile, and the mat foundation is provided thereon. Method.
し、その上に前記マット基礎を設ける請求項１に記載の
構造物の構築方法。4. The method according to claim 1, wherein a rubbery material is laid on the upper side of the existing pile, and the mat foundation is provided thereon.
物のあった地盤を良好な土質が表れる深さまで掘削する
工程と、前記掘削により露出した既存杭の上部を解体す
る工程とを含む請求項１，３，４のいずれかに記載の構
造物の構築方法。5. The method according to claim 1, further comprising a step of excavating the ground having the existing structure to a depth where good soil quality appears before disposing the mat foundation, and a step of dismantling an upper part of the existing pile exposed by the excavation. Item 5. The method for constructing a structure according to any one of Items 1, 3, and 4.
既存杭とは別に新設杭を設けて、既存及び新設の両杭と
直接基礎とで前記マット基礎を支持させる請求項１，
３，４，５のいずれかに記載の構造物の構築方法。6. A new pile is provided separately from the existing pile as a pile for supporting the mat foundation, and the mat foundation is supported by both existing and new piles and a direct foundation.
The method for constructing a structure according to any one of 3, 4, and 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000339363A JP2002146809A (en) | 2000-11-07 | 2000-11-07 | Construction method for structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000339363A JP2002146809A (en) | 2000-11-07 | 2000-11-07 | Construction method for structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002146809A true JP2002146809A (en) | 2002-05-22 |
Family
ID=18814442
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000339363A Pending JP2002146809A (en) | 2000-11-07 | 2000-11-07 | Construction method for structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002146809A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007169992A (en) * | 2005-12-21 | 2007-07-05 | Takenaka Komuten Co Ltd | Bearing power increasing method in extension or reconstruction of upper structure of existing building |
| JP2007177407A (en) * | 2005-12-27 | 2007-07-12 | Takenaka Komuten Co Ltd | Underground story extension method under the foundation of existing building |
| JP2008008083A (en) * | 2006-06-30 | 2008-01-17 | Takenaka Komuten Co Ltd | Reconstruction method of building |
| JP2010133206A (en) * | 2008-12-08 | 2010-06-17 | Shimizu Corp | Structure and construction method for newly-built structure using existing pile |
| JP2012246656A (en) * | 2011-05-26 | 2012-12-13 | Takenaka Komuten Co Ltd | Foundation structure of building and method for constructing foundation of building |
| JP6404508B1 (en) * | 2018-02-07 | 2018-10-10 | 株式会社トータル環境 | Rebuilding method |
| JP2019138131A (en) * | 2018-09-12 | 2019-08-22 | 株式会社トータル環境 | Reconstruction method |
| CN111502330A (en) * | 2020-04-14 | 2020-08-07 | 大唐环境产业集团股份有限公司 | Secondary utilization method for building garbage foundation |
| CN111622525A (en) * | 2020-05-26 | 2020-09-04 | 中铁大桥科学研究院有限公司 | Thin-wall high-rise hollow tower column cultural relic displacement safety protection method |
| JP7129290B2 (en) | 2018-09-14 | 2022-09-01 | 大成建設株式会社 | Building floor structure for rebuilding |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2007169992A (en) * | 2005-12-21 | 2007-07-05 | Takenaka Komuten Co Ltd | Bearing power increasing method in extension or reconstruction of upper structure of existing building |
| JP2007177407A (en) * | 2005-12-27 | 2007-07-12 | Takenaka Komuten Co Ltd | Underground story extension method under the foundation of existing building |
| JP2008008083A (en) * | 2006-06-30 | 2008-01-17 | Takenaka Komuten Co Ltd | Reconstruction method of building |
| JP2010133206A (en) * | 2008-12-08 | 2010-06-17 | Shimizu Corp | Structure and construction method for newly-built structure using existing pile |
| JP2012246656A (en) * | 2011-05-26 | 2012-12-13 | Takenaka Komuten Co Ltd | Foundation structure of building and method for constructing foundation of building |
| JP2019138003A (en) * | 2018-02-07 | 2019-08-22 | 株式会社トータル環境 | Reconstruction method |
| JP6404508B1 (en) * | 2018-02-07 | 2018-10-10 | 株式会社トータル環境 | Rebuilding method |
| JP2019138131A (en) * | 2018-09-12 | 2019-08-22 | 株式会社トータル環境 | Reconstruction method |
| JP7050300B2 (en) | 2018-09-12 | 2022-04-08 | 株式会社トータル環境 | Rebuilding method |
| JP7129290B2 (en) | 2018-09-14 | 2022-09-01 | 大成建設株式会社 | Building floor structure for rebuilding |
| CN111502330A (en) * | 2020-04-14 | 2020-08-07 | 大唐环境产业集团股份有限公司 | Secondary utilization method for building garbage foundation |
| CN111622525A (en) * | 2020-05-26 | 2020-09-04 | 中铁大桥科学研究院有限公司 | Thin-wall high-rise hollow tower column cultural relic displacement safety protection method |
| CN111622525B (en) * | 2020-05-26 | 2022-02-01 | 中铁大桥科学研究院有限公司 | Thin-wall high-rise hollow tower column cultural relic displacement safety protection method |
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