JPS6327628A - Correcting work for settlement of foundation slab - Google Patents
Correcting work for settlement of foundation slabInfo
- Publication number
- JPS6327628A JPS6327628A JP16957886A JP16957886A JPS6327628A JP S6327628 A JPS6327628 A JP S6327628A JP 16957886 A JP16957886 A JP 16957886A JP 16957886 A JP16957886 A JP 16957886A JP S6327628 A JPS6327628 A JP S6327628A
- Authority
- JP
- Japan
- Prior art keywords
- grout
- slab
- foundation slab
- injection hole
- level
- 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.)
- Granted
Links
- 239000011440 grout Substances 0.000 claims abstract description 37
- 238000002347 injection Methods 0.000 claims abstract description 36
- 239000007924 injection Substances 0.000 claims abstract description 36
- 238000000034 method Methods 0.000 claims abstract description 22
- 230000008439 repair process Effects 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000011800 void material Substances 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Landscapes
- Working Measures On Existing Buildindgs (AREA)
Abstract
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。[Detailed Description of the Invention] Industrial Field of Application This invention is useful for flattening the level of the foundation slab of a road or building by grouting when the foundation slab of a road or building becomes uneven due to uneven ground subsidence. Concerning subsidence repair methods.
従来の技術
従来、道路や建物のノ、（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下υ、Ｉ士公知に属し実施もされて
いる（例えば特開間８ｌ−４０９２７ｊ；公やり記載の
沈下補修工法）。Conventional technology Conventionally, settlement repair work has been carried out to correct the level of roads and buildings (foundation slabs, etc.) due to uneven ground subsidence, by injecting grout. (For example, Japanese Patent Application Laid-Open No. 81-40927J; subsidence repair method described in the official publication).
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 have been some success stories, there have also been many failures.
ちなみに、グラウト注入により基礎スラブ竿のレベルを
平坦に修復する沈下補修工法の成功実施例は、およそｗ
Ｓ５図に示したように基礎スラブａのみが沈下し、支持
杭すに支えられた柱Ｃは沈下せず、このために基礎スラ
ブａと地ｌｂ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, successful examples of subsidence repair methods that restore the level of foundation slab poles to a flat level by injecting grout are approximately
As shown in Figure S5, only the foundation slab a sinks, but the columns C supported by the support piles do not sink, which creates a gap e between the foundation slab a and the ground lb. This is a case in which grout f is injected into e.
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
ｆｉｄ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ノふ礎スラブ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, examples of conventional failures are approximately as shown in Fig. 6.
This is a case where there is no support pile under the column C, and both the column C and the foundation slab 1 have become uneven due to uneven subsidence of the ground fid. In this way, the foundation slab a remains in close contact with the supporting ground d.
When a hole is made by core boring and grout is injected by attaching the injection pipe g to this hole (Fig. 7), the force F1 that lifts the footing slab a as an effect of grout injection is expressed by the following formula. It is only the power expressed.
Ｆｌ＝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／ｃ量２）
である。Fl=S・P (kg) However, S is the cross-sectional area of the core bored hole, P is the grout pressure (kg/c amount 2)
It is.
つまり、孔の断面積Ｓがグラウトの受圧面蹟でしかない
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０例えば直ｆ１２０ｃｍ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 ｆ １．Ｏｋｇ／ Ｃｍ’ とすると、ス
ラブを持ち上げる力Ｆｌ 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をむやみに大ぎ
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。In other words, since the cross-sectional area S of the hole is only the pressure-receiving surface of the grout, there is no strong solution to achieving the objective other than increasing the grout pressure P. For example, the pressure-receiving area of a core boring hole with a diameter of 120 cm a is 314 cm2, and the grout pressure P f 1. Assuming Okg/Cm', the force Fl to lift the slab is only 314 kg, making it impossible to lift the slab even partially. However, if the grout pressure P is increased unnecessarily, an accident will occur in which the bolts that fix or connect the injection pipe G will break and blow off, making construction impossible and making the work extremely dangerous. .
上記特開昭８１−４０９２７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 subsidence repair method described in JP-A-81-40927.
問題点を解決するための手段
上記従来技術の１８１題点を解決するための手段として
、この発明に係るノ、ｔｉ礎スラブ等の沈下補修工法は
１図面の第１図〜第４図に実施例を示しているとおり。Means for Solving the Problems As a means for solving the 181 problems of the prior art described above, the subsidence repair method for foundation slabs, etc. according to the present invention is implemented in Figures 1 to 4 of one drawing. As shown in the example.
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。A step of providing an injection hole 2 for grout injection in a place where subsidence has occurred in the foundation slab 1 etc. and level correction is required, and through the injection hole 2, the foundation slab 1 etc. and its supporting ground 4.
and forming a gap 3 of a desired size between the two.
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。The structure includes the steps of injecting grout 7 into the void 3 through the injection hole 2 and lifting the foundation slab 1 etc. to correct the level.
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によるウォ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
した注入用バイブロを通じて行なう。In addition, as a specific embodiment, the injection hole 2 is formed by a core boring method, the void 3 is formed by a water jet method using a horizontal blowing nozzle 5 inserted through the injection hole 2, and the grout 7 is injected into the injection hole 2. This is done through an injection vibro fixed to the
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）０例えば直径が２０ｃｓ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 ＝ ＡＸ Ｐ＝７８５０ｃｍ２ Ｘ
ｌ ｋｇ／ｃａ２ ＝７８５０ｋｇとなる。但し、
Ａは空隙３による受圧面積であり、直１１ 、だと７８
５０ｃｍ２． Ｐはグラウト注入圧で通常１ ｋｇ／
Ｃｍ２ である。Function In the case of the present invention, since a gap 3 of a desired size is formed in advance between the foundation slab 1 etc. and its supporting ground 4, this gap 3 forms a large pressure-receiving area for the injection grout 7 (third. 4
For example, if a gap 3 with a diameter of about 1 m is formed under the foundation slab 1 by a horizontal blowing nozzle 5 inserted through an injection hole 2 with a diameter of 20 cs, the grout 7 injected into this gap 3 The force F2 to lift the foundation slab 1 is: F2 = AX P = 7850cm2 X
l kg/ca2 = 7850 kg. however,
A is the pressure receiving area due to the air gap 3, which is 78 in the case of straight 11.
50cm2. P is the grout injection pressure, usually 1 kg/
Cm2.
」−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億である。のみな
らず、２，１ｉＦａスラブｌ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１例えばノ＾礎スラブ１に１麿ピッチ位で多数設
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、広い床面植にわたる沈下補修を確実にできるの
である。”-With the artificially increased lifting force F2 as described above, the foundation slab 1 can be lifted, even partially, to a certain extent, and it is possible to restore the level to a flat level. In addition, since the lifting of the 2,1iFa slab 1 spreads to its surrounding areas (Fig. 4), it becomes possible to correct the deviation over a wide area. By repeating such grout injection sequentially through a large number of injection holes 2 provided at a pitch of about 1 square inch in the foundation slab 1, for example, it is possible to reliably repair subsidence over a wide floor area. be.
実施例
次に、図面の第１図〜第４図に示したこの発明の詳細な
説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail as shown in FIGS. 1 to 4 of the drawings.
まずｆｆ１１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, Figure ff11 shows the stage in which injection holes 2 for grout injection are provided at locations in the foundation slab 1 where the level needs to be corrected to be flat when uneven settlement of the ground 4 occurs. There is. To create the injection hole 2, a hole with a diameter of about 20 cm is precisely bored in the slab 1 using 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
１厘位の空隙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、ウォータージェット工法に限らないが
、現在のところウォータージェット工法が最も軽便で有
力である。その上、ウォ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λ
（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 a stage in which a gap 3 having a diameter of about 1 cm is formed by a water jet method using a horizontal blowing nozzle 5 inserted through the injection hole 2. The means for forming the void 3 is not limited to the water jet method, but the water jet method is currently the easiest and most effective method. Moreover, the advantage of forming the void 3 using the water jet method is that the injected water has the property of easily seeping into the narrow gap and passing through, especially λ
(It is easy to pass through the boundary between the foundation slab 1 and the supporting ground 4,
This creates a so-called water supply, making it easier for the grout (cement milk) that will be injected later to pass through.
ｆＪＳ３図は、前記注入孔２にグラウトの注入用バイブ
ロを取付は固定し、前記のように形成した空隙３中ヘグ
ラウトアを注入しつつある段階を示している。Figure fJS3 shows a stage in which a vibro for grout injection is attached and fixed to the injection hole 2 and grout is being injected into the gap 3 formed as described above.
また、第４図は、注入したグラウト７によりノ、（礎ス
ラブｌ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１１１位に拡大されたグラウトの受圧面植に
は、注入したグラウト７の圧力（１ｋｇ／ ｃ＋＊’
）が均等に作用するので１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。In addition, FIG. 4 exaggerates the stage in which the foundation slab 1 is lifted by the injected grout 7.
The pressure of the injected grout 7 (1 kg/c + *'
) act evenly, so as explained in the section of 1 action, the foundation slab 1 will be lifted with a force of about 8 tons.
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。Therefore, it is possible to safely and reliably restore the level of the foundation slab 1 to a flat subsidence repair.
特に、注入したグラウト７で基礎スラブｌ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、−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ｌ■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植種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 with the injected grout 7, the outer part of the original gap 3 is lifted up and the gap 3 is inevitably enlarged, so that it is possible to repair the subsidence over a wide area. Then, the injection hole 2 is placed in the range where the effect of the above-mentioned subsidence repair can be reached, for example, in the range of diameter 1
By providing a large number of grouting grouts and repeating the same grouting procedure in sequence, it is possible to reliably and quickly perform settlement repair over a wide range of the foundation slab 1.
しかも、各注入孔２に対するグラウト７の１１人雇又は
圧力を２１！Ｉ察することにより、各注入孔２の位と毎
にレベル調整を行なうことができる。Moreover, the grout 7 for each injection hole 2 requires 11 people or 21 pressures! By observing this, the level can be adjusted for 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、グラウト注入用バイブロには開閉
弁８が付設されている。In order to adjust the injection of grout 7 or to stabilize the injection grout until it solidifies, the grout injection vibro is equipped with an on-off valve 8.
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４０ｃａ＋ 、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？ｌＩｉ修の実効性が確認された。By the way, according to one example, by using this subsidence repair method, the building can be settled by a maximum of 40 ca+ and a minimum of 5 cm, which is enough to flatten the level of the foundation slab. The effectiveness of the IIi modification was confirmed.
未発り１が奏する効果
以上に実に＠とａｔ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、ノ！
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ＭＡ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の面植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。As explained in detail in conjunction with @, the effect achieved by the undeveloped item 1 is even greater than that of the subsidence repair method for foundation slabs, etc. according to the present invention.
The gap 3 is formed between the foundation slab 1, etc. and its supporting ground 4, and the pressure receiving surface MA of the grout is sufficiently expanded. An extremely large lifting force F2 proportional to the face planting of the void 3 acts, making it possible to reliably and safely repair the foundation slab 1, etc., which has subsided and requires level correction, thereby extending its service life in a healthy manner. It is possible.
第１図〜第４図はこの発１１１に係る基礎スラブ等の沈
下補修工法の工程説ＩＪ１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ＩＪＩ図である
。
第１！！１
第２國
＃！ＢＷｉ
第４！５８Figures 1 to 4 are IJ1 diagrams showing the process of subsidence repair work for foundation slabs, etc. related to this development 111, Figures 5 and 6 are explanatory diagrams of the conventional construction method, and Figure 7 is IJI diagrams explaining the workings of the conventional construction method. It is a diagram. 1st! ! 1 Second country #! BWi No. 4!58
Claims (1)
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
。 【２】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。[Claims] [1] An injection hole (2) for injecting grout in a place where subsidence occurs in the foundation slab (1) and requires level correction.
forming a gap (3) of a desired size between the foundation slab (1) etc. and its supporting ground (4) through the injection hole (2); A subsidence repair method for foundation slabs, etc., comprising the steps of: injecting grout (7) into the void (3) and lifting the foundation slab (1), etc. to correct the level. [2] The injection hole (2) is formed by the core boring method, and the gap (3) is formed by the water jet method using a side blow nozzle (5) inserted through the injection hole (2), and the grout (7) is injected. The method for preventing subsidence of foundation slabs, etc., as set forth in claim 1, characterized in that the injection is carried out 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 true JPS6327628A (en) | 1988-02-05 |
| JPH0739668B2 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 (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 |
| CN113668626A (en) * | 2021-08-31 | 2021-11-19 | 中铁第四勘察设计院集团有限公司 | Bridge pier column deviation rectifying method for soft soil foundation |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108999226B (en) * | 2018-07-24 | 2020-06-05 | 山东建筑大学 | Inclination correcting method for building with rotary displacement frame structure |
-
1986
- 1986-07-18 JP JP16957886A patent/JPH0739668B2/en not_active Expired - Lifetime
Cited By (5)
| 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 |
| CN113668626A (en) * | 2021-08-31 | 2021-11-19 | 中铁第四勘察设计院集团有限公司 | Bridge pier column deviation rectifying method for soft soil foundation |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0739668B2 (en) | 1995-05-01 |
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