JP2880641B2 - Foundation building method - Google Patents
Foundation building methodInfo
- Publication number
- JP2880641B2 JP2880641B2 JP7162694A JP7162694A JP2880641B2 JP 2880641 B2 JP2880641 B2 JP 2880641B2 JP 7162694 A JP7162694 A JP 7162694A JP 7162694 A JP7162694 A JP 7162694A JP 2880641 B2 JP2880641 B2 JP 2880641B2
- Authority
- JP
- Japan
- Prior art keywords
- ground
- foundation
- cement
- thickness
- construction method
- 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
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は基礎構築方法に関する。
さらに詳しくは、基礎コンクリート・ブロックを用いる
基礎構築方法の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for building a foundation.
More specifically, the present invention relates to improvement of a foundation construction method using a foundation concrete block.
【０００２】[0002]
【従来の技術】プレハブ住宅においては、据付け期間の
短縮および製品の品質安定化ならびに向上のために、主
要部材が工場においてあらかじめ製造された状態、いわ
ゆるプレハブ化された状態で据付け現場に出荷されてい
る。この一貫として、基礎もあらかじめ、図３に示すよ
うな基礎コンクリート・ブロック（以下、単に基礎ブロ
ックという）ａの状態で据付け現場に出荷されている。
なお、図３において、ｂは捨てコンクリート下地、ｃは
砕石下地を示す。2. Description of the Related Art In a prefabricated house, in order to shorten an installation period and stabilize and improve the quality of a product, main components are shipped to an installation site in a state where they are manufactured in advance in a factory, that is, in a so-called prefabricated state. I have. As a part of this, the foundation has been shipped to the installation site in advance in the state of a foundation concrete block (hereinafter simply referred to as a foundation block) a as shown in FIG.
In addition, in FIG. 3, b shows a discarded concrete foundation and c shows a crushed stone foundation.
【０００３】しかるに、基礎設計においては、上部荷重
に応じて基礎底面積（布基礎の場合は基礎幅）が調節さ
れて、基礎底面下の地盤に作用する接地圧を地耐力以下
になるようにされている。したがって、地耐力は据付け
場所ごとに異なっている関係上、据付け場所に応じたサ
イズの基礎ブロックの製造がなされることになる。その
ため、基礎ブロックを標準化することができず、種々の
サイズの基礎ブロックを準備しておかなければならない
という問題がある。それに伴い、基礎ブロックの在庫管
理も煩雑になるという問題もある。However, in the foundation design, the foundation bottom area (the foundation width in the case of a cloth foundation) is adjusted in accordance with the upper load so that the ground pressure acting on the ground under the foundation bottom is equal to or less than the ground bearing capacity. Have been. Therefore, since the bearing capacity differs for each installation location, a base block having a size corresponding to the installation location is manufactured. Therefore, there is a problem that the basic blocks cannot be standardized and basic blocks of various sizes must be prepared. Accordingly, there is a problem that inventory management of the basic blocks is complicated.
【０００４】また、同一建物においても、例えば平屋部
分と２階建て部分とでは、基礎にかかる荷重が異なるた
め、基礎幅を変えなければならないということも、前記
諸問題を助長している。[0004] Further, even in the same building, for example, the load applied to the foundation is different between a one-story portion and a two-story portion, so that the width of the foundation must be changed, which furthers the above problems.
【０００５】この問題は、顧客のニーズが多様化および
複雑化している現状においては一層顕著となっている。[0005] This problem has become more remarkable in a situation where customer needs are diversified and complicated.
【０００６】[0006]
【発明が解決しようとする課題】本発明はかかる従来技
術の問題点に鑑みなされたものであって、地耐力あるい
は負荷荷重が異なっても、基礎ブロックを同一とするこ
とができる基礎構築方法を提供することを目的としてい
る。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and provides a method for constructing a foundation capable of making the same foundation block even when the ground bearing capacity or the applied load is different. It is intended to provide.
【０００７】[0007]
【課題を解決するための手段】本発明の基礎構築方法
は、基礎の下部地盤の所定範囲を所定厚さにおいてセメ
ントと混合する工程と、前記セメントが混合された下部
地盤を転圧する工程と、前記転圧された下部地盤を硬化
させる工程とを含んでいる基礎構築方法であって、前記
所定厚さが、下記式により算出された値が０．１を超え
ていれば、その値に基づいた厚さとされ、その値が０．
１未満であれば、１０ｃｍとされることを特徴とする基
礎構築方法。Ｈ sc ＝（Ｂ 3 −Ｂ 5 ）／２ ここに、 Ｈ sc ：厚さ 〔ｍ〕 Ｂ 3 ：地耐力が３ｔｆ／ｍ 2 の地盤における必要基礎幅 〔ｍ〕 Ｂ 5 ：地耐力が５ｔｆ／ｍ 2 の地盤における必要基礎幅 〔ｍ〕 [MEANS FOR SOLVING THE PROBLEMS] The basic construction method of the present invention
Is to sew a predetermined area of the lower ground of the foundation at a predetermined thickness.
Mixing with the cement, and the lower part where the cement is mixed.
Compacting the ground and hardening the compacted lower ground
Building method including the step of causingAnd said
When the thickness calculated by the following formula exceeds 0.1
If so, the thickness is determined based on the value, and the value is set to 0.
If it is less than 1, it is 10 cm.
Foundation building method.H sc = (B Three -B Five ) / 2 here, H sc :thickness [M] B Three : Ground strength 3 tf / m Two Required Foundation Width on Ground [m] B Five : Ground strength 5tf / m Two Required Foundation Width on Ground [m]
【０００８】[0008]
【０００９】 また、本発明の基礎構築方法において
は、セメントの混合割合が、一律に１００ｋｇ／ｍ3と
されてもよく、あるいは現場試験により決定されてもよ
い。現場試験による場合には、材令３日のテストピース
の強度に基づいて決定されるのが好ましい。Further, in the basic construction method of the present invention, the mixing ratio of the cement may be uniformly 100 kg / m 3 , or may be determined by an on-site test. In the case of an on-site test, it is preferable that the determination be made based on the strength of the test piece on the three-day age.
【００１０】[0010]
【作用】本発明においては、基礎ブロック据付け前に、
基礎下部の地盤を所望の地耐力が得られるように改質し
ているので、地耐力あるいは負荷荷重が異なっても同一
の基礎ブロックを用いて基礎を構築できる。In the present invention, before the foundation block is installed,
Since the ground under the foundation is modified so as to obtain a desired ground strength, the foundation can be constructed using the same foundation block even if the ground strength or the applied load is different.
【００１１】[0011]
【実施例】以下、本発明を実施例に基づいて説明する
が、本発明はかかる実施例のみに限定されるものではな
い。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments, but the present invention is not limited to these embodiments.
【００１２】本発明の基礎構築方法では、図１に示すよ
うに、従来の工法で施されていた基礎下の砕石地業（栗
石地業）と捨てコンクリート作業を省略し、それに替わ
って基礎の下部地盤を所定の厚さ、および幅でセメント
を混合した後、転圧を行なうとともにセメントを硬化さ
せて地盤の改質を行う。この後、基礎ブロックの据付け
を行うのであるが、その際の墨出しは、この硬化したセ
メント、いわゆるソイルセメント上面においてなし得
る。In the foundation construction method of the present invention, as shown in FIG. 1, the crushed stone work (Kuriishi ground work) and the dumping concrete work under the foundation, which were performed by the conventional method, are omitted. After the lower ground is mixed with a cement having a predetermined thickness and width, the ground is reformed by performing rolling and hardening the cement. After that, the foundation block is installed. In this case, the inking can be performed on the hardened cement, so-called soil cement upper surface.
【００１３】この場合、住宅が建てられる土地の地耐力
は、３ｔｆ／ｍ2以上のものが約８割を占めるところか
ら、改質される厚さを下記式により算出される値に基づ
いて決定しても実用上問題を生じない。Ｈsc＝（Ｂ3−
Ｂ5）／２ ここに、 Ｈsc ：厚さ 〔ｍ〕 Ｂ3 ：地耐力が３ｔｆ／ｍ2の地盤における必要基礎幅 〔ｍ〕 Ｂ5 ：地耐力が５ｔｆ／ｍ2の地盤における必要基礎幅 〔ｍ〕[0013] In this case, since the land bearing capacity of the land where the house is built is 3tf / m 2 or more occupies about 80%, the thickness to be reformed is determined based on the value calculated by the following equation. This does not cause any practical problem. H sc = (B 3 −
B 5 ) / 2, where, H sc : thickness [m] B 3 : required foundation width in the ground with a ground bearing capacity of 3 tf / m 2 [m] B 5 : required foundation in the ground with a ground strength of 5 tf / m 2 Width [m]
【００１４】ただし、その値に基づく厚さが１０ｃｍ未
満の場合に、施工の便宜上、一律に１０ｃｍとされる。However, when the thickness based on the value is less than 10 cm, the thickness is uniformly set to 10 cm for convenience of construction.
【００１５】また、混合されるセメントの割合は、前記
事情を考慮して、一律に１００ｋｇ／ｍ3とすれば、施
工性を向上させることができる。Further, if the ratio of the cement to be mixed is uniformly set to 100 kg / m 3 in consideration of the above-mentioned circumstances, the workability can be improved.
【００１６】なお、施工の厳密性を考慮すれば、施工現
場における現場試験によりセメントの混合割合を決定す
るのが好ましい。この現場試験は、例えば、図２に示す
ように、施工現場に適当な大きさの穴をいくつか堀り
（図２（ａ）参照）、その穴を利用してセメントの混合
割合の異なるテストピース３Ａ（８０ｋｇ／ｍ3），３
Ｂ（１００ｋｇ／ｍ3），３Ｃ（１２０ｋｇ／ｍ3）を作
製して（同（ｂ）参照）、それを市販されている簡易締
固め測定器（例えばインパクトソイルハンマー（商品
名））４により強度を測定する（同（ｃ）参照）ことに
よりなされる。その場合、施工工程のいたずらな長期化
を避けるために、材令３日のものにより強度試験を行い
判断するのが望ましい。In consideration of the strictness of construction, it is preferable to determine the mixing ratio of cement by an on-site test at the construction site. In this field test, for example, as shown in FIG. 2, several holes of an appropriate size are dug at the construction site (see FIG. 2 (a)), and the holes are used to test different cement mixing ratios. Peace 3A (80 kg / m 3 ), 3
B (100 kg / m 3 ) and 3C (120 kg / m 3 ) were prepared (see (b)), and they were measured with a commercially available simple compaction measuring instrument (for example, Impact Soil Hammer (trade name)) 4. This is done by measuring the intensity (see (c)). In that case, in order to avoid unnecessarily prolonging the construction process, it is desirable to make a judgment by performing a strength test with a material age of 3 days.
【００１７】以下、添付図面を参照しながら、本発明を
より具体的に説明する。Hereinafter, the present invention will be described more specifically with reference to the accompanying drawings.
【００１８】 例えば、地盤の地耐力が３ｔｆ／ｍ2で
あるとすると、従来の方法では、図３に示すように、７
００ｍｍ幅の地耐力３ｔｆ／ｍ2用基礎ａが用いられ
る。しかるに、本発明の基礎構築法により、図１に示す
ように、７００ｍｍ幅で１５０ｍｍ厚さの範囲を改質２
したとすると、すなわちソイルセメント地業２を施した
とすると、その上に、４００ｍｍ幅の５ｔｆ／ｍ2基礎
１を据付ければ、基礎底面に作用した５ｔｆ／ｍ2の応
力は、ソイルセメント体中を基礎構造力学の原理に従い
４５度の角度で分散する。その結果、地盤に接するソイ
ルセメント底面部の応力は、３ｔｆ／ｍ2以下に低減さ
れる。すなわち、この場合は、厚さ１５０ｍｍ、幅７０
０ｍｍの範囲を改質すれば、地耐力が５ｔｆ／ｍ2の基
礎ブロックを使用できることがわかる。このことを前記
式に則して補足説明すると、前記説明から地耐力３ｔｆ
／ｍ 2 の地盤における必要基礎幅Ｂ 3 〔ｍ〕は０．７ｍで
あり、また地耐力５ｔｆ／ｍ 2 の地盤における必要基礎
幅Ｂ 5 〔ｍ〕は０．４ｍであるから、改質の必要厚さＨ
SC 〔ｍ〕は前記式より０．１５ｍ、つまり１５０ｍｍと
して求まる。 For example, assuming that the ground bearing capacity of the ground is 3 tf / m 2 , according to the conventional method, as shown in FIG.
A foundation a having a ground strength of 3 tf / m 2 having a width of 00 mm is used. However, according to the basic construction method of the present invention, as shown in FIG.
In other words, if soil cement groundwork 2 is applied, a 400 mm-wide 5 tf / m 2 foundation 1 is installed thereon, and the 5 tf / m 2 stress acting on the bottom of the foundation is reduced by the soil cement body. The inside is dispersed at an angle of 45 degrees according to the principle of basic structural mechanics. As a result, the stress at the bottom of the soil cement in contact with the ground is reduced to 3 tf / m 2 or less. That is, in this case, the thickness is 150 mm and the width is 70
It can be seen that if the range of 0 mm is modified, a foundation block having a ground bearing capacity of 5 tf / m 2 can be used. This is
Supplementary explanation based on the equation is as follows.
/ M 2 The required base width B 3 [m] on the ground is 0.7 m
Yes, and the necessary foundation for the ground with a ground bearing capacity of 5 tf / m 2
Since the width B 5 [m] is 0.4 m, the necessary thickness H for reforming is given.
SC [m] is 0.15 m from the above equation, that is, 150 mm.
Is determined.
【００１９】この場合、ソイルセメント体は、作用する
圧縮応力に耐え得る圧縮強度を有する必要があるが、か
かる圧縮強度は、理論上は、１ｍ3に対して数１０ｋｇ
のセメントを混合すれば得られる。しかしながら、安全
をみて、例えば１００ｋｇ／ｍ3とされるのが好まし
い。その際、確実性や経済性を望むのであれば、前記の
ごとく、現場試験により決定すればよい。In this case, the soil cement body needs to have a compressive strength that can withstand the compressive stress that acts, but the compressive strength is theoretically several tens of kg per m 3 .
Can be obtained by mixing the above cement. However, from the viewpoint of safety, for example, it is preferably 100 kg / m 3 . At this time, if certainty or economy is desired, the determination may be made by a field test as described above.
【００２０】なお、地耐力がさらに小さい地盤において
は、その地盤に対応させて改質範囲を拡大すれば、４０
０ｍｍ幅の５ｔｆ／ｍ2用の基礎ブロックが使用でき
る。In the case of a ground having a smaller ground bearing capacity, if the reforming range is expanded in accordance with the ground, the ground becomes 40
A base block for 5 tf / m 2 with a width of 0 mm can be used.
【００２１】以上本発明を実施例に基づいて説明してき
たが、本発明はかかる実施例のみに限定されるものでは
なく、種々改変が可能である。例えば、地盤の改質範囲
を拡大すれば、地耐力が３ｔｆ／ｍ2の地盤に対して
も、幅のより狭い基礎ブロックを用いることができる。Although the present invention has been described based on the embodiments, the present invention is not limited to only the embodiments, and various modifications are possible. For example, if the ground reforming range is expanded, a narrower base block can be used even for the ground having a ground bearing strength of 3 tf / m 2 .
【００２２】[0022]
【発明の効果】以上詳述したように、本発明の基礎構築
方法によれば、以下のような優れた効果が得られる。As described in detail above, according to the basic construction method of the present invention, the following excellent effects can be obtained.
【００２３】（１）基礎幅を地耐力、上部荷重の片寄り
などによらず一定として設計・施工できる。(1) The base width can be designed and constructed to be constant irrespective of the bearing capacity of the ground and the offset of the upper load.
【００２４】（２）前記利点により、基礎の種類を少な
くでき、プレハブ工法における基礎ブロックの在庫管理
を簡素化できる。(2) Due to the above advantages, the types of foundations can be reduced, and inventory management of the foundation blocks in the prefabricated construction method can be simplified.
【００２５】（３）砕石地業、捨てコンクリート工を省
略でき、工期短縮が図れる。(3) The crushed stone industry and waste concrete work can be omitted, and the construction period can be shortened.
【００２６】（４）掘削残土を少なくすることができ
る。(4) Excavation residual soil can be reduced.
【００２７】（５）コストを低減できる。(5) Cost can be reduced.
【図１】本発明の基礎構築方法の説明図である。FIG. 1 is an explanatory diagram of a basic construction method of the present invention.
【図２】現場試験の説明図である。FIG. 2 is an explanatory view of a field test.
【図３】従来の基礎構築方法の説明図である。FIG. 3 is an explanatory diagram of a conventional foundation construction method.
１ 基礎コンクリート・ブロック（基礎ブロッ
ク） ２ ソイルセメント地業（地盤の改質範囲） ３ テストピース ４ 簡易締固め測定器DESCRIPTION OF SYMBOLS 1 Foundation concrete block (foundation block) 2 Soil cement ground business (ground modification area) 3 Test piece 4 Simple compaction measuring device
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) E02D 3/12 102 E02D 3/046 E02D 27/28 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) E02D 3/12 102 E02D 3/046 E02D 27/28
Claims (4)
おいてセメントと混合する工程と、前記セメントが混合
された下部地盤を転圧する工程と、前記転圧された下部
地盤を硬化させる工程とを含んでいる基礎構築方法であ
って、前記所定厚さが、下記式により算出された値が
０．１を超えていれば、その値に基づいた厚さとされ、
その値が０．１未満であれば、１０ｃｍとされることを
特徴とする基礎構築方法。Ｈ sc ＝（Ｂ 3 −Ｂ 5 ）／２ ここに、 Ｈ sc ：厚さ 〔ｍ〕 Ｂ 3 ：地耐力が３ｔｆ／ｍ 2 の地盤における必要基礎幅 〔ｍ〕 Ｂ 5 ：地耐力が５ｔｆ／ｍ 2 の地盤における必要基礎幅 〔ｍ〕 1. A predetermined range of a lower ground of a foundation is set to a predetermined thickness.
Mixing with the cement in the
Rolling the pressed lower ground, and the rolled lower part
And a step of hardening the ground.In
Thus, the predetermined thickness is a value calculated by the following equation:
If it exceeds 0.1, it will be a thickness based on that value,
If the value is less than 0.1, it will be 10 cm
Characteristic foundation construction method.H sc = (B Three -B Five ) / 2 here, H sc :thickness [M] B Three : Ground strength 3 tf / m Two Required Foundation Width on Ground [m] B Five : Ground strength 5tf / m Two Required Foundation Width on Ground [m]
ｇ／ｍ3とされていることを特徴とする請求項１記載の
基礎構築方法。2. The mixing ratio of cement is uniformly 100 k.
Basic construction method according to claim 1, characterized in that it is the g / m 3.
定されることを特徴とする請求項１記載の基礎構築方
法。3. The method of claim 1, wherein the mixing ratio of the cement is determined by an on-site test.
ピースの強度に基づいて決定されることを特徴とする請
求項３記載の基礎構築方法。4. A foundation construction method according to claim 3, wherein the mixing ratio of cement is determined based on the intensity of the test piece of wood age 3 days.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7162694A JP2880641B2 (en) | 1994-03-15 | 1994-03-15 | Foundation building method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7162694A JP2880641B2 (en) | 1994-03-15 | 1994-03-15 | Foundation building method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07259075A JPH07259075A (en) | 1995-10-09 |
| JP2880641B2 true JP2880641B2 (en) | 1999-04-12 |
Family
ID=13466059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7162694A Expired - Lifetime JP2880641B2 (en) | 1994-03-15 | 1994-03-15 | Foundation building method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2880641B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11343667A (en) * | 1998-04-03 | 1999-12-14 | Daiwa House Ind Co Ltd | Structure for fixing column base with underground beam made of reinforced concrete |
| JP7263671B2 (en) * | 2018-08-09 | 2023-04-25 | 株式会社竹中工務店 | pile foundation structure |
-
1994
- 1994-03-15 JP JP7162694A patent/JP2880641B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07259075A (en) | 1995-10-09 |
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