JPH0739668B2 - Subsidence repair method for foundation slabs - Google Patents
Subsidence repair method for foundation slabsInfo
- Publication number
- JPH0739668B2 JPH0739668B2 JP16957886A JP16957886A JPH0739668B2 JP H0739668 B2 JPH0739668 B2 JP H0739668B2 JP 16957886 A JP16957886 A JP 16957886A JP 16957886 A JP16957886 A JP 16957886A JP H0739668 B2 JPH0739668 B2 JP H0739668B2
- Authority
- JP
- Japan
- Prior art keywords
- grout
- injection hole
- injection
- void
- slab
- 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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- Working Measures On Existing Buildindgs (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 この発明は、道路や建物の基礎スラブ等が地盤の不等沈
下により不陸を生じた場合に、その基礎スラブ等のレベ
ルをグラウト注入により平坦に修復する沈下補修工法に
関する。TECHNICAL FIELD The present invention is to flatten the level of a foundation slab or the like of a road or a building by grouting when the foundation slab or the like becomes uneven due to uneven subsidence of the ground. It relates to a subsidence repair method for repairing.
従来の技術 従来、道路や建物の基礎スラブ等が地盤の不等沈下によ
り不陸を生じた場合に、グラウト注入によりレベル修正
をする沈下補修工法は公知に属し実施もされている（例
えば特開昭61−40927号公報記載の沈下補修工法）。2. Description of the Related Art Conventionally, a subsidence repairing method for correcting a level by grouting when a foundation slab of a road or a building causes unevenness due to uneven subsidence of the ground is well known and practiced (eg Subsidence repair construction method described in JP-A-61-40927).
但し、その実施例には成功例もあるけれども、失敗例も
多かった。However, although there were successful cases in the examples, there were also many failed cases.
ちなみに、グラウト注入により基礎スラブ等のレベルを
平坦に修復する沈下補修工法の成功実施例は、およそ第
５図に示したように基礎スラブａのみが沈下し、支持杭
ｂに支えられた柱ｃは沈下せず、このために基礎スラブ
ａと地盤ｂとの間に空隙ｅが生じ、たまたまこの空隙ｅ
中にグラウトｆを注入したような場合である。By the way, in the successful embodiment of the settlement repair method of flattening the level of the foundation slab and the like by the grout injection, as shown in FIG. 5, only the foundation slab a sinks, and the column c supported by the support pile b is supported. Does not sink, and as a result, a void e is formed between the foundation slab a and the ground b, and it happens that the void e
This is the case when grout f is injected into the inside.
本発明が解決しようとする問題点 逆に、従来の失敗例は、およそ第６図に示したように、
柱ｃの下に支持杭がなく、柱ｃと基礎スラブ１が共に地
盤ｄの不等沈下により不陸を生じたような場合である。
このように支持地盤ｄに密着したままの基礎スラブａに
コアボーリングにより孔をあけ、この孔に注入パイプｇ
を取付けてグラウト注入を行なった場合（第７図）は、
グラウト注入による効果として基礎スラブａを持ち上げ
る力F1は、下記の式で表わされる力でしかない。Problems to be Solved by the Present Invention On the contrary, the conventional failure example is as shown in FIG.
This is a case in which there is no support pile below the pillar c and both the pillar c and the foundation slab 1 have become unplanned due to uneven subsidence of the ground d.
In this way, a hole is made by core boring in the foundation slab a which is still in close contact with the supporting ground d, and the injection pipe g is inserted in this hole.
When grout is injected with the attached (Fig. 7),
The force F 1 for lifting the base slab a as the effect of the grout injection is only the force represented by the following formula.
F1＝Ｓ・Ｐ（kg）但し、Ｓはコアボーリングされた孔の
断面積、Ｐはグラウト圧（kg/cm2）である。F 1 = S · P (kg) where S is the cross-sectional area of the core-bored hole, and P is the grout pressure (kg / cm 2 ).
つまり、孔の断面積Ｓがグラウトの受圧面積でしかない
ため、グラウト圧Ｐを大きくすること以外に強力に目的
を達成する解決策がなかった。例えば直径20cmのコアボ
ーリングの孔の受圧面積ａは314cm2で、グラウト圧Ｐを
1.0kg/cm2とすると、スラブを持ち上げる力F1はわずか
に314kgでしかなく、スラブを部分的にもせよ持ち上げ
ることは不可能である。だからといって、グラウト圧Ｐ
をむやみに大きくすると、注入用パイプｇを固定し又は
接続するボルトが破断して吹飛ぶとかの事故が発生し、
施工は不可能であるし、甚だ危険な作業になる。That is, since the cross-sectional area S of the hole is only the pressure receiving area of the grout, there is no solution that strongly achieves the purpose other than increasing the grout pressure P. For example, the pressure receiving area a of the core boring hole with a diameter of 20 cm is 314 cm 2 , and the grout pressure P is
Given 1.0 kg / cm 2 , the force F 1 for lifting the slab is only 314 kg and it is impossible to lift the slab in any way. However, the grout pressure P
If it is unnecessarily increased, the bolts that fix or connect the injection pipe g may be broken and blown off, causing an accident.
Construction is impossible, and it is extremely dangerous work.
上記特開昭61−40927号公報記載の沈下補修工法の場合
にもこの問題点があることは否めない。It cannot be denied that this problem also exists in the case of the subsidence repairing method described in JP-A No. 61-40927.
問題点を解決するための手段 上記従来技術の問題点を解決するための手段として、こ
の発明に係る基礎スラブ等の沈下補修工法は、図面の第
１図〜第４図に実施例を示しているとおり、 基礎スラブ１等において沈下が生じレベル修正が必要と
される場所にグラウト注入用の注入孔２を設ける段階
と、 前記注入孔２を通じて基礎スラブ１等とその支持地盤４
との間に所望広さの空隙３を形成する段階と、 前記注入孔２を通じて前記空隙３中にグラウト７を注入
し基礎スラブ１等を持ち上げてレベル修正を行なう段階
と、 より成る構成とした。Means for Solving the Problems As means for solving the problems of the above-mentioned conventional technology, a settlement repair method for a foundation slab or the like according to the present invention is shown in FIG. 1 to FIG. As described above, the step of providing the injection hole 2 for the grout injection in the place where the subsidence occurs in the foundation slab 1 etc. and the level correction is required, and the foundation slab 1 etc. and its supporting ground 4 through the injection hole 2
And a step of forming a void 3 having a desired width between the groove and the groove, and a step of injecting grout 7 into the void 3 through the injection hole 2 and lifting the base slab 1 and the like to perform level correction. .
なお、具体的実施態様として、注入孔２はコアボーリン
グ工法によって設け、空隙３は前記注入孔２を通じて挿
し入れた横吹きノズル５によるウオータージェット工法
により形成し、グラウト７の注入は前記注入孔２に固定
した注入用パイプ６を通じて行なう。As a specific embodiment, the injection hole 2 is provided by the core boring method, the void 3 is formed by the water jet method by the lateral blowing nozzle 5 inserted through the injection hole 2, and the grout 7 is injected by the injection hole 2 method. Through the injection pipe 6 fixed to.
作用 本発明の場合、予め基礎スラブ１等とその支持地盤４と
の間に所望広さの空隙３を形成するので、この空隙３が
注入グラウト７の大きな受圧面積を形成する（第3,4
図）。例えば直径が20cmの注入孔２を通じて挿し入れた
横吹きノズル５により直径が1m程度の空隙３が基礎スラ
ブ１の下に形成されたとすると、この空隙３の中に注入
したグラウト７によって基礎スラブ１を持ち上げる力F2
は、 F2＝Ａ×Ｐ＝7850cm2×1kg/cm2＝7850kgとなる。但し、
Ａは空隙３による受圧面積であり、直径1mだと7850cm2,
Pはグラウト注入圧で通常1kg/cm2である。Function In the case of the present invention, since the void 3 having a desired width is formed in advance between the foundation slab 1 and the like and the supporting ground 4 thereof, this void 3 forms a large pressure receiving area of the injection grout 7 (third and fourth portions).
Figure). For example, if a void 3 having a diameter of about 1 m is formed below the foundation slab 1 by a horizontal blowing nozzle 5 inserted through an injection hole 2 having a diameter of 20 cm, the foundation slab 1 is injected by the grout 7 injected into the cavity 3. Lifting force F 2
Becomes F 2 = A × P = 7850cm 2 × 1kg / cm 2 = 7850kg. However,
A is the pressure receiving area by the void 3, and if the diameter is 1 m, it is 7850 cm 2 ,
P is the grout injection pressure, which is usually 1 kg / cm 2 .
上述のように人工的に増大された持ち上げ力F2によれ
ば、基礎スラブ１は部分的にもせよ十分に持ち上げら
れ、レベルを平坦に修復することが可能である。のみな
らず、基礎スラブ１の持ち上げがその周辺部に波及して
ゆく（第４図）ので、広域にわたるしベルの修正が可能
となるのである。そして、このようなグラウト注入を、
例えば基礎スラブ１に1mピッチ位で多数設けた注入孔２
…を通じて順次くり返して行なうことにより、広い床面
積にわたる沈下補修を確実にできるのである。Due to the artificially increased lifting force F 2 as described above, the foundation slab 1 can be partially lifted, if at all, and the level can be restored flat. Not only that, since the lifting of the foundation slab 1 spreads to its peripheral portion (Fig. 4), it is possible to correct the bell over a wide area. And such grout injection,
For example, a number of injection holes 2 are provided in the basic slab 1 at a pitch of 1 m.
It is possible to reliably perform subsidence repair over a large floor area by repeating the procedure sequentially through.
実施例 次に、図面の第１図〜第４図に示したこの発明の実施例
を説明する。Embodiment Next, an embodiment of the present invention shown in FIGS. 1 to 4 of the drawings will be described.
まず第１図は、地盤４の不等沈下により不陸を生じた場
合に、基礎スラブ１のうちレベルを平坦に修正する必要
のある場所にグラウト注入用の注入孔２を設けた段階を
示している。注入孔２の開設は、コアボーリング工法に
よりスラブ１に直径が20cmぐらいの孔をきっちりあけ
る。First, FIG. 1 shows a stage in which an injection hole 2 for injecting grout is provided in a place of the foundation slab 1 where the level needs to be corrected to be flat when unevenness is caused by uneven settlement of the ground 4. ing. The injection hole 2 is opened by drilling a hole having a diameter of about 20 cm in the slab 1 by the core boring method.
第２図は、前記注入孔２を通じて挿し入れた横吹きノズ
ル５を使用したウォータージェット工法により、直径が
1m位の空隙３を形成した段階を示している。空隙３を形
成する手段は、ウオータージェット工法に限らないが、
現在のところウオータージェット工法が最も軽便で有力
である。その上、ウオータージェット工法により空隙３
を形成した場合の利点は、注入された水が本来狭い隙間
に滲み込んで通り易い性質を有しているため、特に基礎
スラブ１と支持地盤４との境界に通って行き易く、これ
により所謂水道を作るので、その後に注入されるグラウ
ト（セメントミルク）が通り易くなるのである。FIG. 2 shows that the diameter was changed by the water jet method using the horizontal blowing nozzle 5 inserted through the injection hole 2.
The stage in which the void 3 of about 1 m is formed is shown. The means for forming the void 3 is not limited to the water jet method,
At present, the water jet method is the most convenient and powerful. In addition, the void 3 by the water jet method
The advantage in the case of forming the base is that the injected water has a property that it originally permeates into a narrow gap and is easy to pass through, so that it is particularly easy to pass through the boundary between the foundation slab 1 and the supporting ground 4, which is a so-called The water supply makes it easier for the grout (cement milk) injected afterwards.
第３図は、前記注入孔２にグラウトの注入用パイプ６を
取付け固定し、前記のように形成した空隙３中へグラウ
ト７を注入しつつある段階を示している。FIG. 3 shows a stage in which the grout injection pipe 6 is attached and fixed to the injection hole 2 and the grout 7 is being injected into the void 3 formed as described above.
また、第４図は、注入したグラウト７により基礎スラブ
１を持ち上げた段階を誇張して示している。空隙３によ
り直径1m位に拡大されたグラウトの受圧面積には、注入
したグラウト７の圧力（1kg/cm2）が均等に作用するの
で、作用の項で説明したように約８トン弱の力で基礎ス
ラブ１を持ち上げることになる。よって、安全に確実に
基礎スラブ１のレベルを平坦に修復するところの沈下補
修ができる。Moreover, FIG. 4 exaggeratedly shows the stage in which the foundation slab 1 is lifted by the injected grout 7. Since the pressure (1 kg / cm 2 ) of the injected grout 7 acts evenly on the pressure receiving area of the grout expanded to about 1 m in diameter by the void 3, a force of about 8 tons or less as explained in the section of operation. Then, the foundation slab 1 is lifted. Therefore, it is possible to safely and surely perform the subsidence repair of the level of the basic slab 1 to be restored flat.
特に、注入したグラウト７で基礎スラブ１を持ち上げる
と、当初の空隙３の周辺部の外方までが持ち上がり必然
的に空隙３が拡大する結果となるので、一層広範囲にわ
たる沈下補修ができる。そして、注入孔２を前述した沈
下補修の効果が及ぶ範囲、たとえば直径1mの範囲に１個
の割合で多数設け、同様なグラウト注入の手順を順時に
くり返し実施することにより、基礎スラブ１につき広範
囲にわたる沈下補修を積極的に確実に迅速に行なうこと
ができる。In particular, when the foundation slab 1 is lifted by the injected grout 7, the outer periphery of the original void 3 is lifted and the void 3 is inevitably expanded, so that a more extensive subsidence repair can be performed. Then, a large number of injection holes 2 are provided at a ratio of one in a range where the effect of the settlement repair mentioned above is reached, for example, in a range of a diameter of 1 m, and the same procedure of grout injection is repeated in sequence so that the basic slab 1 has a wide area. It is possible to positively and reliably and quickly carry out subsidence repair.
しかも、各注入孔２に対するグラウト７の注入量又は圧
力を調整することにより、各注入孔２の位置毎にレベル
調整を行なうことができる。Moreover, by adjusting the injection amount or pressure of the grout 7 into each injection hole 2, the level can be adjusted for each position of each injection hole 2.
グラウト７の注入を調節し又は注入グラウトが固化する
まで安定させるため、グラウト注入用パイプ６には開閉
弁８が付設されている。An open / close valve 8 is attached to the grout injection pipe 6 in order to regulate the injection of the grout 7 or to stabilize it until the injection grout is solidified.
ちなみに、ある実施例によれば、このような沈下補修工
法により、建物が最大40cm,最小5cmの不等沈下を起した
基礎スラブのレベルを平坦に修復するだけの沈下補修の
実効性が確認された。By the way, according to one embodiment, such a settlement repair method confirms the effectiveness of the settlement repair that only flatly restores the level of the foundation slab where the building has caused uneven settlement of maximum 40 cm and minimum 5 cm. It was
本発明が奏する効果 以上に実施例と併せて詳述したとおりであって、この発
明に係る基礎スラブ等の沈下補修工法によれば、基礎ス
ラブ１等とその支持地盤４との間に空隙３を形成してグ
ラウトの受圧面積Ａを十分に拡大するので、注入するグ
ラウト７の圧力Ｐをあまり大きくしないでも、基礎スラ
ブ１等には空隙３の面積に比例した極めて大きな持ち上
げ力F2が作用し、沈下を生じレベル修正が必要となった
基礎スラブ１等を確実に安全に補修することができ、も
ってその耐用寿命を健全に延ばすことができるのであ
る。Advantageous Effects of the Present Invention As described above in detail with reference to the embodiments, according to the settlement repair method for a foundation slab or the like according to the present invention, a gap 3 is formed between the foundation slab 1 and the supporting ground 4 thereof. Since the pressure receiving area A of the grout is sufficiently enlarged by forming the grouting, an extremely large lifting force F 2 proportional to the area of the void 3 acts on the foundation slab 1 etc. even if the pressure P of the injected grout 7 is not increased so much. However, it is possible to reliably and safely repair the foundation slab 1 or the like which has caused a subsidence and whose level needs to be corrected, and thus the useful life thereof can be extended soundly.
第１図〜第４図はこの発明に係る基礎スラブ等の沈下補
修工法の工程説明図，第５図と第６図は従来工法の説明
図，第７図は従来工法の作用説明図である。FIG. 1 to FIG. 4 are process explanatory views of a settlement method for a foundation slab or the like according to the present invention, FIGS. 5 and 6 are explanatory diagrams of a conventional method, and FIG. 7 is an operational explanatory diagram of the conventional method. .
───────────────────────────────────────────────────── フロントページの続き (72)発明者 佐藤 秀雄 東京都江東区南砂２丁目５番14号 株式会 社竹中工務店技術研究所内 (72)発明者 仲西 康 東京都江東区南砂２丁目５番14号 株式会 社竹中工務店技術研究所内 (72)発明者 坪田 章 東京都江東区南砂２丁目５番14号 株式会 社竹中工務店技術研究所内 (72)発明者 岡田 克也 東京都江東区南砂２丁目５番14号 株式会 社竹中工務店技術研究所内 (72)発明者 宮口 正夫 東京都中央区銀座８丁目21番１号 株式会 社竹中工務店東京本店内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Hideo Sato 2-5-14 Minamisuna, Koto-ku, Tokyo Inside the Takenaka Corporation Technical Research Institute (72) Inventor Yasushi Nakanishi 2-chome, Minamisuna, Koto-ku, Tokyo No. 14 Incorporated Takenaka Corp. Technical Research Institute (72) Inventor Akira Tsubota 2-5-14 Minamisuna, Koto-ku, Tokyo Incorporated Incorporated Takenaka Corp. Technical Research Institute (72) Inventor Katsuya Okada Minamisuna, Koto-ku, Tokyo 2-5-14 Takenaka Corp. Technical Research Institute (72) Inventor Masao Miyaguchi 8-21-1 Ginza, Chuo-ku, Tokyo Incorporated Takenaka Corp. Tokyo Head Office
Claims (2)
ベル修正が必要とされる場所にグラウト注入用の注入孔
（２）を設ける段階と、 前記注入孔（２）を通じて基礎スラブ（１）等とその支
持地盤（４）との間に所望広さの空隙（３）を形成する
段階と、 前記注入孔（２）を通じて前記空隙（３）中にグラウト
（７）を注入し基礎スラブ（１）等を持ち上げてレベル
修正を行なう段階と、 より成ることを特徴とする基礎スラブ等の沈下補修工
法。1. A step of providing an injection hole (2) for injecting grout in a place where subsidence occurs in the basic slab (1) or the like and level correction is required, and the basic slab (1) is introduced through the injection hole (2). Etc. and a supporting ground (4) thereof to form a void (3) of a desired width, and a grout (7) is injected into the void (3) through the injection hole (2) to form a base slab ( 1) A subsidence repair method for basic slabs, which comprises the steps of lifting the level etc. to correct the level.
て設け、空隙（３）は前記注入孔（２）を通じて挿し入
れた横吹きノズル（５）によるウオータージェット工法
により形成し、グラウト（７）の注入は前記注入孔
（２）に固定した注入用パイプ（６）を通じて行なうこ
とを特徴とする特許請求の範囲第１項に記載した基礎ス
ラブ等の沈下防止工法。2. The injection hole (2) is provided by a core boring method, and the void (3) is formed by a water jet method by a side-blowing nozzle (5) inserted through the injection hole (2), and a grout (7). The method for preventing subsidence of a foundation slab or the like according to claim 1, wherein the injection is performed through an injection pipe (6) fixed to the injection hole (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16957886A JPH0739668B2 (en) | 1986-07-18 | 1986-07-18 | Subsidence repair method for foundation slabs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16957886A JPH0739668B2 (en) | 1986-07-18 | 1986-07-18 | Subsidence repair method for foundation slabs |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6327628A JPS6327628A (en) | 1988-02-05 |
| JPH0739668B2 true JPH0739668B2 (en) | 1995-05-01 |
Family
ID=15889078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16957886A Expired - Lifetime JPH0739668B2 (en) | 1986-07-18 | 1986-07-18 | Subsidence repair method for foundation slabs |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0739668B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108999226A (en) * | 2018-07-24 | 2018-12-14 | 山东建筑大学 | Rotation displacement frame structure building correcting method |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0267876U (en) * | 1988-11-09 | 1990-05-23 | ||
| JPH0552043A (en) * | 1991-08-13 | 1993-03-02 | Meiwa Kogyo Kk | Repairing method for building floor face |
| JP2007177447A (en) * | 2005-12-27 | 2007-07-12 | Shiraishi Corp | Removal method for existing underground structure |
| CN113668626B (en) * | 2021-08-31 | 2023-08-04 | 中铁四院集团工程建设有限责任公司 | Bridge pier column deviation correcting method for soft soil foundation |
-
1986
- 1986-07-18 JP JP16957886A patent/JPH0739668B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108999226A (en) * | 2018-07-24 | 2018-12-14 | 山东建筑大学 | Rotation displacement frame structure building correcting method |
| CN108999226B (en) * | 2018-07-24 | 2020-06-05 | 山东建筑大学 | Inclination correcting method for building with rotary displacement frame structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6327628A (en) | 1988-02-05 |
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