JP2836492B2 - Construction method of the lowest floor of a building on cohesive ground - Google Patents
Construction method of the lowest floor of a building on cohesive groundInfo
- Publication number
- JP2836492B2 JP2836492B2 JP18328694A JP18328694A JP2836492B2 JP 2836492 B2 JP2836492 B2 JP 2836492B2 JP 18328694 A JP18328694 A JP 18328694A JP 18328694 A JP18328694 A JP 18328694A JP 2836492 B2 JP2836492 B2 JP 2836492B2
- Authority
- JP
- Japan
- Prior art keywords
- ground
- building
- rigid foam
- lowest floor
- sheet
- 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
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- Foundations (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は飽和した粘性土層を有す
る地盤上に杭を基礎として建造物を構築する際の最下階
床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 lowermost floor when constructing a building based on a pile on a ground having a saturated clayey layer.
【０００２】[0002]
【従来の技術】正規圧密状態（粘性土の有効応力度が圧
密降伏応力度に等しい状態）の粘性土層を有する地盤
は、その儘の状態では変形は起こさないが、その地盤上
に建造物の建築や土盛りなどで荷重が載荷され有効応力
度が増加すると粘性土中の水が排出されて変形し、圧密
による地盤沈下を生ずる。2. Description of the Related Art A ground having a cohesive soil layer in a normal consolidation state (a state in which the effective stress level of the cohesive soil is equal to the consolidation yield stress degree) does not deform in the as-is state, but a structure on the ground is formed. When the effective stress increases due to the load imposed on the building or embankment, the water in the viscous soil is discharged and deformed, causing land subsidence due to consolidation.
【０００３】このため、かかる地盤に建造物を構築する
際には、支持地盤に達する杭を打ち込み、この杭によっ
て建造物全体の荷重を支持地盤に伝達して支持し、建造
物の荷重による圧密力が粘性土層にかかるのを避けるの
が一般的であり、建造物の最下階床も基礎梁と一体とし
た構造スラブとして形成され杭によって支持されてい
る。For this reason, when constructing a building on such ground, a pile reaching the supporting ground is driven in, and the load of the entire building is transmitted to the supporting ground and supported by the pile, and consolidation due to the load of the building is performed. It is common to avoid forces on the cohesive soil layer, and the lowest floor of the building is also formed as a structural slab integral with the foundation beams and supported by piles.
【０００４】[0004]
【発明が解決しようとする課題】建造物の最下階床には
段差や各種のピットなどを設ける場合が多いので、最下
階床を構造スラブで形成するのではなく、土間コンクリ
ート（地山の上に直接配筋・打設するコンクリート）に
より形成することが望まれている。しかし、土間コンク
リートにより最下階床を形成すると、土間コンクリート
の自重＋その床上への積載荷重が粘性土層にかかり、粘
性土層の有効応力度が増加して圧密による地盤沈下を生
じ、最下階床も沈下する、一方、建造物の躯体は杭を介
して支持地盤により支持されていて沈下しないので、最
下階床が不同沈下する危険性が極めて大きい。In many cases, steps or various pits are provided on the lowest floor of a building. Therefore, instead of forming the lowest floor with a structural slab, concrete on the earth (above ground) is required. It is desired to be formed by concrete arranging and placing directly on the concrete. However, if the lowest floor is formed by clay concrete, the weight of the clay concrete + the load on the floor will be applied to the cohesive soil layer, and the effective stress of the cohesive soil layer will increase, causing land subsidence due to consolidation. The lower floor also sinks, while the building frame is supported by the supporting ground via the piles and does not sink, so there is a great risk that the lowest floor will sink unevenly.
【０００５】[0005]
【課題を解決するための手段】本発明は、かかる不同沈
下の危険性を排除し、従来の要望に応えて土間コンクリ
ートにより最下階床を構築する構築工法を提供すること
を目的とするものである。SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the danger of uneven settlement and to provide a construction method for constructing a lowermost floor using slab concrete in response to a conventional demand. It is.
【０００６】即ち、本発明は、粘性土地盤上建造物を杭
基礎及び基礎梁により支持するとともに、該建造物直下
の地山を排土し、その跡に、板状硬質発泡体を下面シー
ト及び上面シートと接着し、かつ、相互間も接着して大
きな硬質発泡体に一体化しながら敷設し、基礎梁の上に
硬質発泡体薄板を載置した後、一体化した硬質発泡体及
び基礎梁上の硬質発泡体薄板の上に土間コンクリートを
打設して最下階床を構築することを特徴とする粘性土地
盤上建造物の最下階床の構築工法である。That is, according to the present invention, a building on a viscous ground is supported by a pile foundation and a foundation beam, and the ground immediately below the building is discharged, and a plate-like rigid foam is placed on the bottom surface of the building.
To the top sheet and the top sheet, and also to each other.
Laying on the foundation beam while laying it in
After placing the rigid foam sheet, the rigid foam and
This is a method of constructing the lowest floor of a cohesive ground-based building, characterized by placing concrete between the floor and a hard foam sheet on the foundation beam to construct the lowest floor.
【０００７】本発明の要点は、建造物直下の地山を排土
しその跡に上下面のシートと一体化した大きな硬質発泡
体を敷設するとともに、基礎梁上に硬質発泡体薄板を載
置した後、その上に土間コンクリートを打設する点であ
る。この地山の排土は最下階床の構築により増加するで
あろう粘性土層の有効応力度の増加を避けるために行う
ものであるから、設計土間コンクリート重量＋土間コン
クリートへの設計積載荷重＋敷設硬質発泡体（付帯材料
を含む）重量に見合う重量以上を予め排土しておくこと
が必要である。The gist of the present invention is that a large hard foam integrated with upper and lower sheets is removed from the ground immediately below the building and the trace is removed.
With laying the body, placing the rigid foam sheet on a foundation beam
After placing, concrete is put on it. This earth removal is performed to avoid an increase in the effective stress of the cohesive soil layer, which will increase due to the construction of the lowest floor. + It is necessary to discharge in advance more than the weight corresponding to the weight of the laid rigid foam (including the auxiliary material).
【０００８】一体化した大きな硬質発泡体は地盤にかか
る荷重を低減する他、土間コンクリートの下型枠、土間
コンクリートにかかる荷重の緩やか且つ円滑な伝達など
の機能が要求されるので、できるだけ低比重で適度な剛
性（硬さ）を持つものが使用される。かかる硬質発泡体
の代表的なものとしては、ポリスチレンフォーム、硬質
ポリウレタンフォーム、泡ガラスなどが挙げられる。[0008] In addition to reducing the load applied to the ground, the integrated large rigid foam is required to have a function such as a lower formwork of the interstitial concrete and a gentle and smooth transmission of the load applied to the interstitial concrete. What has moderate rigidity (hardness) is used. Representative examples of such a rigid foam include polystyrene foam, rigid polyurethane foam, foam glass, and the like.
【０００９】[0009]
【実施例】以下、図面を参照しながら本発明について説
明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.
【００１０】図１（ａ）は粘性土地盤の上部の地山を掘
削して排土しその跡に硬質発泡体を敷設した状態を示す
平面図であり、図１（ｂ）は敷設した硬質発泡体の上に
土間コンクリートを打設して最下階床を構築した状態を
示す立断面図である。FIG. 1 (a) is a plan view showing a state where a ground on the top of a viscous ground is excavated and excavated, and a hard foam is laid on the trace. FIG. 1 (b) is a plan view showing the laid hard ground. It is a sectional elevational view showing the state where the lowest floor was constructed by placing earth concrete on the foam.
【００１１】図１を参照しながら本発明の施工手順につ
いて説明する。The construction procedure of the present invention will be described with reference to FIG.
【００１２】（１）粘性土地盤７に支持地盤に到達する
杭を打ち込んで杭基礎を構築する。(1) A pile reaching the supporting ground is driven into the viscous ground 7 to construct a pile foundation.
【００１３】（２）粘性土地盤７の表面を掘削して、設
計土間コンクリート重量＋土間コンクリートへの設計積
載荷重＋敷設硬質発泡体（付帯材料を含む）重量に見合
う重量の土を排土し、掘削底面は転圧などにより締め固
めると同時に同一レベルに整地する。(2) Excavating the surface of the viscous ground 7 and discharging the soil having a weight corresponding to the weight of the design concrete soil + the design load of the concrete soil + the weight of the laid hard foam (including the accompanying materials). The excavation bottom is compacted by compaction and the like, and at the same time, the ground is leveled.
【００１４】（３）杭頭にフーチング基礎５および基礎
梁６を構築する。なお、（３）の作業は必ずしも（２）
の後で行う必要はなく（２）に先立って行ってもよい
し、（２）、（３）平行して行ってもよい。(3) The footing foundation 5 and the foundation beam 6 are constructed at the pile head. In addition, the work of (3) is not necessarily (2)
It does not need to be performed after (2), and may be performed prior to (2), or (2) and (3) may be performed in parallel.
【００１５】（４）整地された掘削底面の上に下面シー
ト２を敷設する。下面シート２および後記する上面シー
ト３としては引張り強度の大きいものが好ましいので、
単なるプラスチックのシートではなく、織物と樹脂との
積層体であるターポリンを使用するのが好ましい。(4) Lay the bottom sheet 2 on the leveled excavation bottom. Since it is preferable that the lower sheet 2 and the upper sheet 3 described later have high tensile strength,
It is preferable to use not a simple plastic sheet but a tarpaulin which is a laminate of a woven fabric and a resin.
【００１６】（５）下面シート２の上に所定の厚さの板
状硬質発泡体１を敷設する。板状硬質発泡体１の上面が
基礎梁６上面より若干高い位置とする。板状硬質発泡体
１の下面は下面シート２に接着し、側面は板状硬質発泡
体１を相互に接着する。(5) A plate-shaped rigid foam 1 having a predetermined thickness is laid on the lower sheet 2. The upper surface of the plate-shaped rigid foam 1 is located at a position slightly higher than the upper surface of the foundation beam 6. The lower surface of the plate-like rigid foam 1 is adhered to the lower sheet 2, and the side surfaces of the plate-like rigid foam 1 are adhered to each other.
【００１７】（６）板状硬質発泡体１の上に上面シート
３を接着しながら敷設する。(6) The top sheet 3 is laid on the plate-shaped rigid foam 1 while adhering.
【００１８】（７）基礎梁６の上面には硬質発泡体薄板
８を載置し、板状硬質発泡体１と高さを揃える。(7) A rigid foam thin plate 8 is placed on the upper surface of the foundation beam 6 so that the height of the rigid foam 1 is the same as that of the plate-shaped rigid foam 1.
【００１９】（８）上面シート３および硬質発泡体薄板
８の上に土間コンクリート用の鉄筋を配筋した後、土間
コンクリート４を打設して作業は完了する。(8) After arranging reinforcing steel for earth concrete on the top sheet 3 and the hard foam thin plate 8, the earth concrete 4 is cast to complete the work.
【００２０】このようにして土間コンクリート４により
最下階床を形成すると、土間コンクリート４の自重およ
び積載荷重の大部分は多数の板状硬質発泡体１が一体と
なっている硬質発泡体を介して、下方の粘性土地盤に緩
やか且つ円滑に伝達され、且つ、粘性土地盤にかかる負
荷は最下階床の構築によって変化することはないので、
最下階床の構築によって粘性土地盤が沈下することはな
い。When the lowermost floor is formed by the slab concrete 4 in this manner, a large part of the dead weight and the loaded load of the slab concrete 4 are integrally formed by the large number of plate-like rigid foams 1.
Since the rigid foam is gradually and smoothly transmitted to the viscous ground below, and the load on the viscous ground does not change due to the construction of the lowest floor,
The construction of the lowest floor does not cause the viscous ground to sink.
【００２１】[0021]
【発明の効果】（１）粘性土地盤上の建造物に土間コン
クリートで形成されているにも拘わらず、不同沈下する
恐れのない最下階床を構築することが可能となる。According to the present invention, it is possible to construct the lowest floor where there is no possibility of uneven settlement even though the building on the viscous ground is made of earth concrete.
【００２２】（２）粘性土地盤上の建造物の荷重の一部
を粘性土地盤によって直接負担させることが可能となる
ので、基礎杭の本数の低減あるいは小型化が可能とな
る。(2) Since a part of the load of the building on the viscous ground can be directly borne by the viscous ground, the number of foundation piles can be reduced or the size can be reduced.
【図１】（ａ）は粘性土地盤の上部の地山を掘削して排
土しその跡に硬質発泡体を敷設した状態を示す平面図で
あり、（ｂ）は敷設した硬質発泡体の上に土間コンクリ
ートを打設して最下階床を構築した状態を示す立断面図
である。FIG. 1 (a) is a plan view showing a state where a ground on an upper part of a viscous ground is excavated and excavated, and a hard foam is laid on a trace thereof, and FIG. 1 (b) is a plan view of the laid hard foam. It is a sectional elevational view which shows the state where the slab concrete was cast on it and the lowest floor was constructed.
【符号の説明】 １…板状硬質発泡体、２…下面シート、３…上面シー
ト、４…土間コンクリート、５…フーチング基礎、６…
基礎梁、７…粘性土地盤、８…硬質発泡体薄板。[Description of Signs] 1 ... plate-like rigid foam, 2 ... bottom sheet, 3 ... top sheet, 4 ... concrete in soil, 5 ... footing foundation, 6 ...
Foundation beam, 7: viscous ground, 8: rigid foam sheet.
Claims (1)
により支持するとともに、該建造物直下の地山を排土
し、その跡に、板状硬質発泡体を下面シート及び上面シ
ートと接着し、かつ、相互間も接着して大きな硬質発泡
体に一体化しながら敷設し、基礎梁の上に硬質発泡体薄
板を載置した後、一体化した硬質発泡体及び基礎梁上の
硬質発泡体薄板の上に土間コンクリートを打設して最下
階床を構築することを特徴とする粘性土地盤上建造物の
最下階床の構築工法。1. A viscous ground building is supported by a pile foundation and a foundation beam, and a ground immediately below the building is discharged, and a plate-like rigid foam is placed on the bottom surface of the ground sheet. And top surface
Large rigid foam adhered to the sheet and adhered to each other
Lay while integrating with the body, thin rigid foam on the foundation beam
After placing the board , integrated rigid foam and foundation beam
A method of constructing the lowest floor of a viscous ground-based building, characterized by constructing a lowest floor by placing clay concrete on a thin hard foam sheet .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18328694A JP2836492B2 (en) | 1994-08-04 | 1994-08-04 | Construction method of the lowest floor of a building on cohesive ground |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18328694A JP2836492B2 (en) | 1994-08-04 | 1994-08-04 | Construction method of the lowest floor of a building on cohesive ground |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0849244A JPH0849244A (en) | 1996-02-20 |
| JP2836492B2 true JP2836492B2 (en) | 1998-12-14 |
Family
ID=16132999
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18328694A Expired - Lifetime JP2836492B2 (en) | 1994-08-04 | 1994-08-04 | Construction method of the lowest floor of a building on cohesive ground |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2836492B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7514130B2 (en) | 2020-07-13 | 2024-07-10 | 株式会社竹中工務店 | Floor structure on soft ground |
-
1994
- 1994-08-04 JP JP18328694A patent/JP2836492B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7514130B2 (en) | 2020-07-13 | 2024-07-10 | 株式会社竹中工務店 | Floor structure on soft ground |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0849244A (en) | 1996-02-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19980908 |