JPH08134934A - Basement construction method - Google Patents
Basement construction methodInfo
- Publication number
- JPH08134934A JPH08134934A JP6274793A JP27479394A JPH08134934A JP H08134934 A JPH08134934 A JP H08134934A JP 6274793 A JP6274793 A JP 6274793A JP 27479394 A JP27479394 A JP 27479394A JP H08134934 A JPH08134934 A JP H08134934A
- Authority
- JP
- Japan
- Prior art keywords
- wall
- ground
- constructed
- excavated
- reinforced concrete
- 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.)
- Withdrawn
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- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、比較的小規模の低層の
地下室を構築する構築方法に関する。FIELD OF THE INVENTION The present invention relates to a construction method for constructing a relatively small-scale low-rise basement.
【０００２】[0002]
【従来の技術】市街地や住宅地などの密集地に地下室を
構築する場合は隣地（家）と近接して構築する場合が多
く、隣地（家）の地盤沈下を防止するため、構築する地
下室が比較的小規模で低層であっても周囲に仮設の土留
め壁を設置した後、その内側を掘削するのが一般的であ
る。[Prior Art] When constructing a basement in a dense area such as an urban area or a residential area, the basement is often constructed close to the adjacent land (house). Even if it is a relatively small and low-rise building, it is common to dig the inside after installing a temporary earth retaining wall around it.
【０００３】[0003]
【発明が解決しようとする課題】土留め壁はＨ型鋼を地
盤に打ち込み、その間に横矢板を挿入して設置されるの
が一般的であり、相当の工事費を必要とする。そして、
土留め壁は地盤の崩壊は十分防止するが、剛性が十分と
はいえないので地盤表層部分の移動による地盤沈下を完
全には防止できない場合がある。The earth retaining wall is generally installed by driving H-section steel into the ground and inserting a transverse sheet pile between them, which requires a considerable construction cost. And
Although the earth retaining wall sufficiently prevents the ground from collapsing, it may not be able to completely prevent the ground subsidence due to the movement of the surface layer of the ground because it does not have sufficient rigidity.
【０００４】[0004]
【課題を解決するための手段】本発明は、二段階掘削に
よる逆打ち工法を採用することにより、地盤の崩壊は勿
論のこと、表層部分の移動による地盤沈下を招くことな
しに比較的小規模の低層の地下室を構築することを目的
とする。According to the present invention, by adopting the upside down construction method by two-stage excavation, not only the collapse of the ground but also the subsidence of the ground due to the movement of the surface layer is relatively small. The purpose is to build a low rise basement.
【０００５】即ち、本発明は、（Ａ）基礎地業を施した
犬走り部分の内側地盤を土留め壁を必要としない程度に
浅く掘削し、犬走り部分および内周辺を防水シートで覆
う工程、（Ｂ）掘削壁に沿って鉄筋コントクリート造り
の壁を構築する工程、（Ｃ）犬走り部分および上記鉄筋
コントクリート造り壁の上にコンクリートを打設して鉄
筋コンクリート造り板と上記鉄筋コントクリート造り壁
とを一体化した逆Ｌ字型構造体を構築する工程、（Ｄ）
浅く掘削された地盤を所定の深さまで掘削し、掘削面を
防水シートで覆う工程、（Ｅ）新たに掘削された掘削壁
に沿って鉄筋ショットクリート造りの壁を構築して既設
の鉄筋コントクリート造りの壁と一体化した外壁を構築
する工程、（Ｆ）底にコンクリートを打設して鉄筋コン
クリート造りの底板を構築する工程、（Ｇ）天端にコン
クリートを打設して鉄筋コンクリート造りの１階床板を
構築する工程、よりなる地下室の構築方法である。That is, according to the present invention, (A) a step of excavating the inner ground of a dog running portion that has been subjected to basic groundwork to a depth that does not require a retaining wall, and covering the dog running portion and the inner periphery with a waterproof sheet. , (B) a step of constructing a reinforced concrete wall along the excavation wall, (C) a dog running portion and concrete laid on the reinforced concrete wall and the reinforced concrete plate and the reinforced concrete wall Step of constructing an inverted L-shaped structure integrated with a building wall, (D)
The process of excavating the shallow excavated ground to a predetermined depth and covering the excavation surface with a waterproof sheet, (E) Constructing a rebar shotcrete wall along the newly excavated excavation wall to construct an existing rebar control The process of constructing the outer wall integrated with the built wall, the process of (F) placing concrete on the bottom to construct the bottom plate made of reinforced concrete, and (G) the first floor of the reinforced concrete structure placing concrete on the top. It is a method of constructing a basement, which comprises the steps of constructing a floorboard.
【０００６】本発明の第一の要点は、犬走り部分で取り
囲まれた地盤の掘削を二段階に分けて行い、第一段目の
掘削を０．５〜１ｍ程度の土留めを必要としない深さに
留めておき、掘削壁面および犬走り部分に跨がって一体
となった逆Ｌ字型の鉄筋コンクリート造り構造体を構築
することによって、犬走り部分下の基礎で逆Ｌ字型構造
体の荷重を支持し、掘削した地山の土圧に抵抗して地山
表層部分の移動を防止する点である。The first point of the present invention is to excavate the ground surrounded by the dog running portion in two stages, and the excavation of the first stage does not require earth retaining of about 0.5 to 1 m. By keeping it at the depth and constructing an inverted L-shaped reinforced concrete structure that is integrated over the excavation wall surface and the dog running portion, the inverted L-shaped structure is formed on the foundation under the dog running portion. This is to support the load of, and resist the earth pressure of the excavated ground and prevent the movement of the surface layer of the ground.
【０００７】本発明の第二の要点は、犬走り部分および
掘削面を防水シートで覆い、施工時の雨水の浸入による
地山の流動化を防止するとともに、地下室構築後の防水
層としての機能を発揮させる点である。The second essential point of the present invention is to cover the dog running portion and the excavated surface with a waterproof sheet to prevent fluidization of the ground due to infiltration of rainwater during construction and to function as a waterproof layer after construction of the basement. It is a point to demonstrate.
【０００８】上記の各要点の相乗効果により、土留め壁
を設置しなくても隣地の地盤沈下を招くことなしに地下
数ｍ程度の低層の地下室を構築することが可能となる。Due to the synergistic effect of each of the above-mentioned points, it becomes possible to construct a low-rise basement of about several meters underground without inviting ground subsidence in the adjacent land without installing a retaining wall.
【０００９】本発明の上記（Ｂ）工程の鉄筋コントクリ
ート造りの壁の構築は配筋後、型枠を組みコントクリー
トを打設する通常の工法によってもよいし、配筋−吹付
けを繰り返して所定の厚さの鉄筋コントクリート造りと
するショットクリート工法によってもよい。In the above step (B) of the present invention, the wall of the reinforcing bar contcrete structure may be constructed by a normal construction method in which the formwork is assembled after the reinforcing bar is arranged and the contcrete is placed, or the reinforcing bar-spraying is repeated. Alternatively, the shotcrete construction method may be used, in which a reinforcing bar control cleat having a predetermined thickness is formed.
【００１０】[0010]
【実施例】以下図面を参照しながら本発明を説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.
【００１１】図１は本発明方法の施工例の施工手順を示
す工程縦断面図である。図２（ａ）は犬走り部分にコン
クリートを打設する直前の１次掘削壁周辺の縦断面図、
図２（ｂ）は地下室完成時の平面図である。図１、図２
を参照しながら施工例の施工手順を説明する。（本施工
例は外壁上部の構築はショットクリート工法で行い、外
壁の施工に引き続いて内壁を構築した例である。） （１）隣地との境界線１に近い土地に掘削穴２を設け、
そこに地下室を構築することにする。（図１（ａ）） （２）犬走り部分４に基礎地業を施工し、その内側地盤
を１ｍ程度総掘りして１次掘削穴２Ａを形成し犬走り部
分４表面および１次掘削穴２Ａの外周部を防水シート３
Ａで覆う。（図１（ｂ）） （３）１次掘削壁に沿って１次配筋を行う。１次配筋は
縦筋６Ａ、横筋１０Ａ、および後で構築される内壁との
接合筋７が主なもので縦筋６Ａ、横筋１０Ａにはショッ
トクリート工法のための平金網９Ａが取付けられてい
る。縦筋６Ａの下方は十分に土中に挿入されている。シ
ョットクリートを吹付け１次ショットクリート層８Ａを
形成する。（図１（ｃ）、図２（ａ）） （４）１次ショットクリート層８Ａの内側に壁に沿って
２次配筋を行う。２次配筋は縦筋６Ｂ、横筋１０Ｂの配
筋であり、縦筋６Ｂ、横筋１０Ｂには（３）と同様に平
金網９Ｂが取付けられている。縦筋６Ｂの下方も同様に
十分に土中に挿入されている。この際、犬走り部分にも
鉄筋１１を配筋する。その後、ショットクリートを吹付
け２次ショットクリート層８Ｂを形成する。（図１
（ｄ）、図２（ａ）） （５）犬走り部分にコンクリートを打設して鉄筋コンク
リート板１２を形成する。鉄筋コンクリート板１２は既
に形成された鉄筋ショットクリート壁８と一体化し逆Ｌ
字型構造体となる。（図１（ｅ）、図２（ａ）） （６）所定の深さまで総掘りによる２次掘削を行ない、
掘削穴２Ｂを形成し、掘削面全面を防水シート３Ｂで覆
う。防水シート３Ｂの取付けは２次掘削により露出した
防水シート３Ａの下端を適宜切断し、それに防水シート
３Ｂの上端を重ね合わせて接着して行う。上記（３）、
（４）と同様に２次掘削壁に沿って１次配筋−１次吹付
け−２次配筋−２次吹付けを行ない、２次掘削壁に沿っ
た鉄筋ショットクリート壁を既設の鉄筋ショットクリー
ト壁８の下方に一体として形成し、外壁１５を構築す
る。（図１（ｆ）） （７）外壁１５の内面に墨出し、底板の配筋（内壁接合
筋を含めて）をし、コンクリートを打設して底板１６を
構築する。（図１（ｇ）） （８）内壁１８の構築については図示してないが、既設
の接合筋に合わせて内壁の配筋、型枠の組立を行ないコ
ンクリートを打設して鉄筋コンククリート内壁を構築す
る方法やショットクリート工法用パネル（例えば、プラ
スチックフォーム板の両面に平金網を配置し、プラスチ
ックフォーム板を斜めに貫通するラチス線で両面の平金
網を相互に溶接した立体金網パネルなど）を既設の接合
筋に合わせて建て込み、所定の配筋を行った後、ショッ
トクリートを吹付ける方法が採用される。施工性の面か
らは当然後者を採用するのが好ましい。FIG. 1 is a process vertical sectional view showing a construction procedure of a construction example of the method of the present invention. Fig. 2 (a) is a vertical cross-sectional view of the area around the primary excavation wall immediately before placing concrete in the dog running part,
FIG. 2 (b) is a plan view of the completed basement. 1 and 2
The construction procedure of the construction example will be described with reference to. (This construction example is an example in which the upper part of the outer wall is constructed by the shotcrete method, and the inner wall is constructed following the construction of the outer wall.) (1) The excavation hole 2 is provided in the land near the boundary line 1 with the adjacent land,
I will build a basement there. (Fig. 1 (a)) (2) A basic ground work was applied to the dog running part 4 and the inner ground was digged about 1 m to form a primary drilling hole 2A, and the surface of the dog running part 4 and the primary drilling hole were formed. 2A outer peripheral part of the waterproof sheet 3
Cover with A. (Fig. 1 (b)) (3) Primary bar arrangement is performed along the primary excavation wall. The primary bars are mainly vertical bars 6A, horizontal bars 10A, and connecting bars 7 that are connected to the inner wall to be constructed later. The vertical bars 6A and horizontal bars 10A have flat wire nets 9A for the shotcrete construction method attached. There is. The lower part of the vertical line 6A is sufficiently inserted in the soil. Shotcrete is sprayed to form primary shotcrete layer 8A. (FIGS. 1 (c) and 2 (a)) (4) Secondary reinforcement is performed along the wall inside the primary shot cleat layer 8A. The secondary reinforcing bar is a vertical bar 6B and a horizontal bar 10B, and a flat wire net 9B is attached to the vertical bar 6B and the horizontal bar 10B as in (3). Similarly, the lower part of the vertical line 6B is also sufficiently inserted in the soil. At this time, the reinforcing bar 11 is also arranged in the dog running part. Then, shotcrete is sprayed to form the secondary shotcrete layer 8B. (Figure 1
(D), FIG. 2 (a)) (5) Concrete is cast in the dog running portion to form the reinforced concrete plate 12. The reinforced concrete plate 12 is integrated with the already formed reinforced shotcrete wall 8 to form an inverted L
It becomes a character type structure. (Fig. 1 (e), Fig. 2 (a)) (6) Perform secondary digging by total digging to a predetermined depth,
The excavation hole 2B is formed, and the entire excavation surface is covered with the waterproof sheet 3B. The attachment of the waterproof sheet 3B is performed by appropriately cutting the lower end of the waterproof sheet 3A exposed by the secondary excavation, and stacking and adhering the upper end of the waterproof sheet 3B on it. Above (3),
Similar to (4), primary reinforcement-primary spraying-secondary reinforcement-secondary spraying is performed along the secondary excavation wall, and reinforcing bar shotcrete wall along the secondary excavation wall is used for existing reinforcement. It is integrally formed below the shotcrete wall 8 to construct the outer wall 15. (FIG. 1 (f)) (7) The inner surface of the outer wall 15 is marked, the bottom plate is reinforced (including the inner wall joints), and concrete is cast to construct the bottom plate 16. (Fig. 1 (g)) (8) Although the construction of the inner wall 18 is not shown, the inner wall is reinforced and the formwork is assembled in accordance with the existing joints, and concrete is laid to reinforce concrete inner wall. Panel for construction and shotcrete method (for example, three-dimensional wire mesh panel in which flat wire nets are placed on both sides of a plastic foam plate, and flat wire nets on both sides are welded to each other by lattice lines that obliquely penetrate the plastic foam plate) A method is adopted in which the slab is built in accordance with the existing joint reinforcement, the predetermined reinforcement is performed, and then shotcrete is sprayed. From the viewpoint of workability, it is naturally preferable to adopt the latter.
【００１２】（９）外壁１５、内壁１８の天端に所定の
配筋後、コンクリートを打設して鉄筋コンクリート造り
の１階床板１７を構築する。（図１（ｈ）） １階床板１７の構築に際しても、型枠の組立、配筋を行
ないコンクリートを打設する方法、波型鋼板やプレキャ
ストコンクリート板を捨て型枠として敷設し、配筋、コ
ンクリート打設を行う方法などの通常の方法が採用され
る。１階床板１７の構築の場合も施工性の面から後者を
採用するのが好ましい。(9) After arranging a predetermined amount of reinforcement on the top ends of the outer wall 15 and the inner wall 18, concrete is placed to construct the first floor slab 17 made of reinforced concrete. (Fig. 1 (h)) When constructing the first-floor floorboard 17, a method of assembling the formwork, placing the concrete and placing concrete, laying a corrugated steel plate or a precast concrete plate as a discard formwork, A normal method such as a method of placing concrete is adopted. Also in the case of constructing the first-floor floor board 17, it is preferable to adopt the latter from the viewpoint of workability.
【００１３】このようにして、施工例の地下室の構築が
完了する。（図２（ｂ）） 上記の施工例は平地に地下室を構築する場合で犬走りは
外壁天端を一周している。しかし、傾斜地に地上部と地
下部を同時に構築する場合も多い。その場合には図３に
示すように山側の比較的深く掘削する部分と谷側の比較
的浅く掘削する部分とに区分し、本発明による構築方法
は山側のみに適用し、比較的浅く掘削する谷側はオープ
ンカット方式で施工する。従って、谷側部分の底板は山
側部分の外壁下部の構築に先行して構築されることにな
り、逆Ｌ字型構造体は図３（ｃ）に示すように山側の１
辺のみに構築されることになる。傾斜地ではこのように
逆Ｌ字型構造体の設置面積は小さくなるが、土圧がかか
るのは山側からが殆どであり、谷側に構築した躯体が逆
Ｌ字型構造体とともにこの土圧に抵抗するので、山側隣
地の地盤沈下を招く恐れはない。In this way, the construction of the basement of the construction example is completed. (FIG. 2 (b)) The above construction example is a case where a basement is constructed on a flat ground, and dog running runs around the top of the outer wall. However, there are many cases where the above-ground part and the underground part are simultaneously constructed on the sloping land. In that case, as shown in FIG. 3, it is divided into a relatively deep excavation portion on the mountain side and a relatively shallow excavation portion on the valley side, and the construction method according to the present invention is applied only to the mountain side to excavate relatively shallowly. The valley side will be constructed using the open cut method. Therefore, the bottom plate of the valley side portion is constructed prior to the construction of the lower portion of the outer wall of the mountain side portion, and the inverted L-shaped structure is formed on the mountain side as shown in FIG. 3 (c).
It will be built only on the edges. In the sloping ground, the installation area of the inverted L-shaped structure is small in this way, but most of the earth pressure is applied from the mountain side, and the skeleton built on the valley side is exposed to this earth pressure together with the inverted L-shaped structure. Since it resists, there is no fear of causing land subsidence on the land adjacent to the mountain side.
【００１４】[0014]
【発明の効果】土留め壁を設置しなくても隣地の地盤沈
下を招くことなしに地下数ｍ程度の低層の地下室を構築
することが可能となる。[Effects of the Invention] It is possible to construct a low-rise basement of about several meters underground without inviting ground subsidence in the adjacent land without installing a retaining wall.
【図１】本発明方法の施工例の施工手順を示す工程縦断
面図である。FIG. 1 is a process vertical sectional view showing a construction procedure of a construction example of a method of the present invention.
【図２】（ａ）は犬走り部分にコンクリートを打設する
直前の１次掘削壁周辺の縦断面図、（ｂ）は地下室完成
時の平面図である。FIG. 2 (a) is a vertical cross-sectional view around the primary excavation wall immediately before placing concrete on the dog running portion, and FIG. 2 (b) is a plan view of the completed basement.
【図３】本発明方法の傾斜地での適用例を示すもので、
（ａ）、（ｂ）は施工中の縦断面図であり、（ｃ）は完
成時の平面図である。FIG. 3 shows an example of application of the method of the present invention on a sloping land,
(A), (b) is a longitudinal cross-sectional view during construction, (c) is a plan view at the time of completion.
１・・境界線、２・・掘削穴、２Ａ・・１次掘削穴、２
Ｂ・・２次掘削穴、３・・防水シート、３Ａ・・上部防
水シート、３Ｂ・・下部防水シート、４・・犬走り、６
Ａ・・１次掘削穴１次配筋縦筋、６Ｂ・・１次掘削穴２
次配筋縦筋、７・・内壁接合筋、８・・１次掘削穴鉄筋
ショットクリート壁、８Ａ・・１次掘削穴１次ショット
クリート層、８Ｂ・・１次掘削穴２次ショットクリート
層、９Ａ，９Ｂ・・平金網、１０Ａ・・１次配筋横筋、
１０Ｂ・・２次配筋横筋、１１・・犬走り部鉄筋、１２
・・犬走り部鉄筋コンクリート板、１３Ａ・・２次掘削
穴１次配筋縦筋、１３Ｂ・・２次掘削穴２次配筋縦筋、
１４Ａ・・２次掘削穴１次ショットクリート層、１４Ｂ
・・２次掘削穴２次ショットクリート層、１５・・外
壁、１６・・底板、１７・・１階床板。1 ... Boundary line, 2 ... Drilling hole, 2A ... Primary drilling hole, 2
B ... Secondary drilling hole, 3 ... Waterproof sheet, 3A ... Upper waterproof sheet, 3B ... Lower waterproof sheet, 4 ... Dog running, 6
A ... Primary drilling hole primary reinforcement longitudinal bar, 6B ... Primary drilling hole 2
Secondary bar longitudinal bar, 7 ... inner wall joint, 8 ... primary drilling hole rebar shotcrete wall, 8A ... primary drilling hole primary shotcrete layer, 8B ... primary drilling hole secondary shotcrete layer , 9A, 9B ··· Flat wire mesh, 10A ··
10B ... Secondary bar arrangement horizontal bar, 11 ... Dog running rebar, 12
..In dog running part reinforced concrete plate, 13A ... Secondary drilling hole primary reinforcing bar longitudinal bar, 13B ... Secondary drilling hole secondary reinforcing bar longitudinal bar,
14A ... Secondary drill hole primary shotcrete layer, 14B
..Secondary drilling hole secondary shotcrete layer, 15 ... outer wall, 16 ... bottom plate, 17 ... first floor.
Claims (1)
側地盤を土留め壁を必要としない程度に浅く掘削し、犬
走り部分および内周辺を防水シートで覆う工程、（Ｂ）
掘削壁に沿って鉄筋コンクリート造りの壁を構築する工
程、（Ｃ）犬走り部分および上記鉄筋コントクリート造
り壁の上にコンクリートを打設して鉄筋コンクリート造
り板と上記鉄筋コントクリート造り壁とを一体化した逆
Ｌ字型構造体を構築する工程、（Ｄ）浅く掘削された地
盤を所定の深さまで掘削し、掘削面を防水シートで覆う
工程、（Ｅ）新たに掘削された掘削壁に沿って鉄筋ショ
ットクリート造りの壁を構築して既設の鉄筋コントクリ
ート造りの壁と一体化した外壁を構築する工程、（Ｆ）
底にコンクリートを打設して鉄筋コンクリート造りの底
板を構築する工程、（Ｇ）天端にコンクリートを打設し
て鉄筋コンクリート造りの１階床板を構築する工程、よ
りなる地下室の構築方法。1. A process of (A) excavating the inner ground of a dog running portion that has been subjected to basic groundwork to a depth that does not require a retaining wall, and covering the dog running portion and the inner periphery with a waterproof sheet, (B)
The step of constructing a reinforced concrete wall along the excavation wall, (C) Injecting concrete on the dog running part and the reinforced concrete wall, and integrating the reinforced concrete plate and the reinforced concrete wall The step of constructing the inverted L-shaped structure, (D) the step of excavating the shallowly excavated ground to a predetermined depth, and the step of covering the excavation surface with the waterproof sheet, (E) the excavation wall along the newly excavated wall Building a wall made of reinforced shotcrete and an outer wall integrated with the existing wall made of reinforced concrete, (F)
A method of constructing a basement, comprising the steps of placing concrete on the bottom to construct a reinforced concrete bottom plate, and (G) placing concrete on the top to construct a reinforced concrete first-floor floorboard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6274793A JPH08134934A (en) | 1994-11-09 | 1994-11-09 | Basement construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6274793A JPH08134934A (en) | 1994-11-09 | 1994-11-09 | Basement construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08134934A true JPH08134934A (en) | 1996-05-28 |
Family
ID=17546646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6274793A Withdrawn JPH08134934A (en) | 1994-11-09 | 1994-11-09 | Basement construction method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08134934A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018009336A (en) * | 2016-07-12 | 2018-01-18 | 株式会社 Ｓｈｏｗａ | Underground space construction method |
-
1994
- 1994-11-09 JP JP6274793A patent/JPH08134934A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018009336A (en) * | 2016-07-12 | 2018-01-18 | 株式会社 Ｓｈｏｗａ | Underground space construction method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
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