JPS60230423A - Ground improving method - Google Patents

Ground improving method

Info

Publication number
JPS60230423A
JPS60230423A JP8684484A JP8684484A JPS60230423A JP S60230423 A JPS60230423 A JP S60230423A JP 8684484 A JP8684484 A JP 8684484A JP 8684484 A JP8684484 A JP 8684484A JP S60230423 A JPS60230423 A JP S60230423A
Authority
JP
Japan
Prior art keywords
poured
hole
bored
soil
foundation
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
Application number
JP8684484A
Other languages
Japanese (ja)
Inventor
Nobuyuki Kuroyanagi
信之 黒柳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
National House Industrial Co Ltd
Original Assignee
National House Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by National House Industrial Co Ltd filed Critical National House Industrial Co Ltd
Priority to JP8684484A priority Critical patent/JPS60230423A/en
Publication of JPS60230423A publication Critical patent/JPS60230423A/en
Pending legal-status Critical Current

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/12Consolidating by placing solidifying or pore-filling substances in the soil

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Structural Engineering (AREA)
  • Agronomy & Crop Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Soil Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Abstract

PURPOSE:To enable stabilization of surface soil quality of a ground for a building, by a method wherein a hole is bored deep to lower than the under surface of a foundation, expandable cement is poured in the hole up to a level about equal to that of the under surface of the foundation, and the hollow hole part, above the poured part, of the bored hole is backfilled. CONSTITUTION:Holes 3, each bored down to lower than the under surface of a foundation 2, are bored in juxataposition with each other, expandable cement 4 is poured in the bored holes 3, and is placed such that the upper end of a poured part 5 is located in a level about equal to that of the lower end of a pit excavation with a depth H. After the poured part 5 is formed, a hollow hole part 6, above the poured part 5, of the bored hole 2 is backfilled with soil A excavated for formation of the hole. The expansible cement 4 is expanded in a barrel during curing, and soil B between the poured parts 5 is consolidated to form the poured parts integrally with each other. This facilitates improvement of a ground, enables reduction in a cost to improve a ground, and permits to perform an optimum building work according to viscosity and depth of soil.

Description

【発明の詳細な説明】 〔技術分野〕 本発明は、膨張性セメントを利用した施工容易かつ安価
な地盤改良方法に関する。
DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an easy and inexpensive ground improvement method using expandable cement.

〔背景技術〕[Background technology]

軟質地盤の改良方法として、杭等を打設し、又はバイブ
ロフローテーション工法、サンドドレーン工法などが用
いられているが、これらの工法の施工には大がかりな装
置が必要となり、家屋などの小建築物の地盤改良のため
には設備が過大かつ高価にすぎる。
As a method for improving soft ground, driving piles, etc., vibroflotation method, sand drain method, etc. are used, but these methods require large-scale equipment and are difficult to install for small buildings such as houses. Equipment is too large and expensive for ground improvement.

〔発明の目的〕[Purpose of the invention]

本発明は、地表に設ける穿孔内に膨張性セメントを注入
することによって、軟弱地盤の圧密を促進し、特に家屋
など比較的小型の建築物の地盤における、その表層土質
の安定のために好適に利用しうる地盤改良方法の提供を
目的としている。
The present invention promotes the consolidation of soft ground by injecting expandable cement into a hole provided in the ground surface, and is particularly suitable for stabilizing the surface soil of the ground of relatively small buildings such as houses. The purpose is to provide usable ground improvement methods.

□〔発明の開示〕 以下本発明の一実施例を図面に基ブき説明する。□ [Disclosure of invention] An embodiment of the present invention will be described below with reference to the drawings.

図において、地−改良方法は、基礎2の下面を越える深
さの穿孔3・−を並設するとともに、該穿孔3に、膨張
性セメント4を注入しかつその注入、部5上方の空孔部
6に土Δを埋め戻す。
In the figure, the soil improvement method is to construct perforations 3-- with a depth exceeding the lower surface of the foundation 2 in parallel, and to inject expandable cement 4 into the perforations 3, and then to form a hole above part 5. Backfill part 6 with soil Δ.

前記穿孔3は、5〜3.0CI11、好ましくは10〜
20cmの口径を有し、又その深さは家屋の基礎2の下
面、従って基礎2の根切り深さ11からさらに10〜3
00csa、通常50〜100cIIl程度下方にのび
る深さを有するごとく、各種のオーガを用いてかつ穿孔
3間で小間隙りを隔てるごとく並設される。
The perforation 3 has a CI of 5 to 3.0 CI11, preferably 10 to
It has a diameter of 20 cm, and its depth is the lower surface of the foundation 2 of the house, so from the root cut depth 11 of the foundation 2, it is further 10 to 3
00 csa, usually extending downward to a depth of about 50 to 100 cIIl, using various augers, and are arranged in parallel with a small gap between the holes 3.

前記膨張性セメント4は、小野田セメント株式会社の製
造にかかる商品名「小野田エクスパン」、吉澤石灰工業
株式会社が取扱う商品名「スプリッタ」等、膨張性能の
大きい酸化カルシウムを成分とする石灰系かつ乾燥収縮
によるひび割れ防止、高強度コンクリート製品の製作又
は建築物破砕用等のために使用する膨張剤とセメント、
コンクリートとの混和物であって、固化に際して比較的
大きな膨張率を有するものを使用する。
The expandable cement 4 is a dry lime-based cement containing calcium oxide with high expansion performance, such as "Onoda Expan" manufactured by Onoda Cement Co., Ltd. and "Splitter" manufactured by Yoshizawa Lime Industry Co., Ltd. Expanding agents and cement used for preventing cracks due to shrinkage, manufacturing high-strength concrete products, and crushing buildings, etc.
A mixture with concrete that has a relatively large expansion coefficient upon solidification is used.

該膨張性セメント4は、前記穿孔3内に、適宜の打設装
置を用いて注入し、その注入部5の上端が、根切り深さ
1■程度となるように打設される。
The expandable cement 4 is injected into the perforation 3 using a suitable casting device, and is cast so that the upper end of the injection part 5 has a root cutting depth of about 1 inch.

又注入部5を形成した後、該注入部5上方の穿孔2の空
孔部6を穿孔した土Aを用いて埋め戻しかつ締め固めた
のち養生させる。
After forming the injection part 5, the hole 6 of the perforation 2 above the injection part 5 is backfilled with the soil A, compacted, and then cured.

膨張性セメント4は、その養生の間、例えば樽状に膨張
し、注入部5−間の土Bを圧密させ一体化するとともに
注入部5が杭状体として機能することにより、その地盤
耐力を向上する。又膨張性セメント4は周囲の土に浸透
することにより、周囲の土をも固化し強固な地盤を形成
する。なお養生ののち、堀起こし、基礎2を形成する。
During its curing, the expandable cement 4 expands into, for example, a barrel shape, and consolidates and integrates the soil B between the injection part 5 and the injection part 5, which functions as a pile-shaped body, thereby increasing the soil bearing capacity. improves. In addition, the expandable cement 4 permeates into the surrounding soil, thereby solidifying the surrounding soil and forming a strong foundation. After curing, the trench will be raised and the foundation 2 will be formed.

なお本発明の地盤改良方法において、前記穿孔3を、建
物により覆われる全ての地盤に亘って開穿したうえ膨張
性セメント4を注入することによって、各注入部5が集
客して群杭作用を発揮でき、いわゆるベタ基礎状の改良
地盤を形成できる。
In the ground improvement method of the present invention, by drilling the holes 3 over all the ground covered by the building and injecting the expandable cement 4, each injection part 5 attracts customers and performs a group pile action. It is possible to form improved ground in the form of a so-called solid foundation.

又形成される基礎2の下面に沿・う地盤のみを強化する
こともできる。
It is also possible to strengthen only the ground along the lower surface of the foundation 2 to be formed.

さらに透孔3の口径、深さは建物の重置と土質に応じて
定められ、又穿孔3間の距1i1tLは、膨張性セメン
ト4の膨張力によって、注入部5.5間の土Bがやや圧
密される程度に設定する。また好ましくは強固な圧密力
をうる小長さに設定する。
Furthermore, the diameter and depth of the through holes 3 are determined depending on the building placement and soil quality, and the distance 1i1tL between the perforations 3 is determined by the expansion force of the expandable cement 4, so that the soil B between the injection parts 5.5 Set it so that it is slightly compressed. Preferably, the length is set to be small enough to provide strong compaction force.

なお施工に際しては、穿孔、膨張性セメント4の注入を
一連にしかも複数個同時に処理しえる適宜の装置を用い
てもよく、ざらに土の埋め戻しをも該装置を用いて行う
ことにより、さらに施工性を高めうる。
In addition, during construction, an appropriate device may be used that can perform drilling and injection of expandable cement 4 in a series or at the same time. It can improve workability.

〔発明の効果〕〔Effect of the invention〕

畝上のごとく本発明の地盤改良方法は、穿孔、膨張性セ
メントの注入、土の埋め戻しによって基礎を支持する1
llllllを改良でき、施工が容易であり地盤改良の
ためのコストを低減するとともに、土の粘着とその深さ
に応じて最適な施工をなしうるなど多くの効果を奏し・
5る。
The ground improvement method of the present invention, like a ridge, supports the foundation by drilling, injecting expandable cement, and backfilling the soil.
It has many effects, such as being able to improve lllllll, being easy to construct, reducing the cost of ground improvement, and being able to perform optimal construction depending on the adhesion of the soil and its depth.
5 Ru.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は穿孔に膨張性セメントを注入した状態を示す断
面図、第2図は空孔部に土を埋め戻した状態を示す断面
図、第3図は施工完了後の状態を示す断面図である。 2−基礎、 3−穿孔、 4・−膨張性セメント、5−
注入部、 6−・空孔部。 特許出願人 ナショナル住宅産業株式会社代理人 弁理
士 苗 村 正 第1図 第3図 第2図
Figure 1 is a sectional view showing the state in which expandable cement has been injected into the hole, Figure 2 is a sectional view showing the state in which the hole is backfilled with soil, and Figure 3 is a sectional view showing the state after construction is completed. It is. 2-foundation, 3-perforation, 4-expandable cement, 5-
Injection part, 6--hole part. Patent applicant National Housing Industry Co., Ltd. Agent Patent attorney Tadashi Naemura Figure 1 Figure 3 Figure 2

Claims (1)

【特許請求の範囲】[Claims] (1) 基礎下面を越える深さの穿孔を並設するととも
に、該穿孔に、基礎下面程度の高さとなる迄膨張性セメ
ントを注入した上、注入部上方の空孔部を埋め戻すこと
を特徴とする地盤改良方法。
(1) A feature of this method is to create parallel holes with a depth that exceeds the bottom surface of the foundation, inject expandable cement into the holes until the height reaches the same level as the bottom surface of the foundation, and then backfill the hole above the injection point. Ground improvement method.
JP8684484A 1984-04-27 1984-04-27 Ground improving method Pending JPS60230423A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8684484A JPS60230423A (en) 1984-04-27 1984-04-27 Ground improving method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8684484A JPS60230423A (en) 1984-04-27 1984-04-27 Ground improving method

Publications (1)

Publication Number Publication Date
JPS60230423A true JPS60230423A (en) 1985-11-15

Family

ID=13898116

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8684484A Pending JPS60230423A (en) 1984-04-27 1984-04-27 Ground improving method

Country Status (1)

Country Link
JP (1) JPS60230423A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6363816A (en) * 1986-09-03 1988-03-22 Sekisui House Ltd Improving work of surface soil of ground for building
CN114016498A (en) * 2021-11-15 2022-02-08 中国建筑第四工程局有限公司 Construction method for preventing hole string of overlength hollow cast-in-place pile in sea-filling area

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6363816A (en) * 1986-09-03 1988-03-22 Sekisui House Ltd Improving work of surface soil of ground for building
CN114016498A (en) * 2021-11-15 2022-02-08 中国建筑第四工程局有限公司 Construction method for preventing hole string of overlength hollow cast-in-place pile in sea-filling area
CN114016498B (en) * 2021-11-15 2023-11-03 中国建筑第四工程局有限公司 Construction method for preventing filling pile from being in series holes in ultra-long hollow holes in sea-filling area

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