JPS61221409A - Ground improvement method - Google Patents
Ground improvement methodInfo
- Publication number
- JPS61221409A JPS61221409A JP5828185A JP5828185A JPS61221409A JP S61221409 A JPS61221409 A JP S61221409A JP 5828185 A JP5828185 A JP 5828185A JP 5828185 A JP5828185 A JP 5828185A JP S61221409 A JPS61221409 A JP S61221409A
- Authority
- JP
- Japan
- Prior art keywords
- ground
- slime
- chemical
- pipe
- water
- 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
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating 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
Description
【発明の詳細な説明】
く産業上の利用分野〉
開示技術は、軟弱地盤に対し硬化薬液やセメント、ミル
ク等の地盤改良剤を注入させる技術分野に属する。[Detailed Description of the Invention] Industrial Application Field> The disclosed technology belongs to the technical field of injecting a hardening chemical solution, cement, milk, or other ground improvement agent into soft ground.
而して、この発明は、二重管、三重管等の複重管の薬液
注入パイプをして対象とする地盤中に削孔し、所定深度
まで貫入した後に地上へ引揚げながら該薬液注入パイプ
の噴射ノズルより硬化剤の薬液を噴射ノズルより地盤に
側方に向け、噴出、注入させながら該噴射ノズルと削孔
との間隙から地盤の土砂や地下水と、該薬液との混合さ
れたスライムを地上に上昇、排出させる地盤改良方法に
関する発明であり、特に、該薬液を地盤中に噴出、注入
しながら薬液注入パイプを引揚げるプロセスにおいて、
薬液の噴射ノズルからの噴出レベルより上位のレベルで
希釈水を先んじて噴出させるようにし、後工程から上昇
してくるスライムの１痕を低下させてスムースにスライ
ムが地上まで排出されるようにした地盤改良方法に係る
発明である。Therefore, this invention involves drilling a hole in the target ground using a double pipe, triple pipe, etc., and then injecting the chemical while withdrawing it to the ground after penetrating to a predetermined depth. A hardening agent chemical is directed laterally into the ground from the injection nozzle of the pipe, and as it is jetted and injected, a slime mixed with earth, sand and groundwater from the ground and the chemical is ejected from the gap between the injection nozzle and the drilled hole. This invention relates to a ground improvement method for raising and discharging chemical liquid to the ground, and in particular, in the process of lifting a chemical liquid injection pipe while spouting and injecting the chemical liquid into the ground.
The dilution water is ejected in advance at a level higher than the ejection level from the chemical injection nozzle, reducing the number of traces of slime rising from the subsequent process and allowing the slime to be smoothly discharged to the ground. This invention relates to a ground improvement method.
〈従来技術〉
周知の如く、軟弱地盤の地盤改良において、地盤中に硬
化薬液を注入したり、或は、止水壁や地中杭等の造成の
ために、地盤中にセメントミルクや水ガラス等の薬液を
注入する工法が広（用いられているが、一般には薬液注
入パイプを地盤中に削孔して所定深さ貫入した後、地上
に向けて引揚げながら該薬液注入パイプの所定位置に設
けた噴射ノズルより薬液を噴出して地盤中に注入するよ
うにしている。<Prior art> As is well known, in ground improvement of soft ground, hardening chemicals are injected into the ground, or cement milk or water glass is injected into the ground to create water-stop walls, underground piles, etc. Construction methods for injecting chemical liquids such as The chemical liquid is ejected from the injection nozzle installed in the ground and injected into the ground.
ところで、地盤には地下水もあり、したがって、噴出さ
れた薬液は勿論のこと、地盤中の土砂や地下水が混合し
あって、所謂スライムとなり、薬液注入パイプと削孔と
の間隙からスライムアップを行って薬液注入パイプの薬
液より噴出される薬液の増量を量的に吸収して薬液の地
盤中への噴出注入を図るようにされている。By the way, there is groundwater in the ground, so not only the spouted chemical solution but also the earth and sand in the ground and groundwater mix together to form what is called slime, and the slime is drawn up from the gap between the chemical injection pipe and the drilled hole. It is designed to absorb the increased amount of the chemical liquid spouted from the chemical liquid injection pipe and to inject the chemical liquid into the ground.
〈発明が解決しようとする問題点〉
而して、該地盤が上層から所定深度の下層まで砂層等の
地盤である場合には、上記薬液注入パイプと地盤との間
隙は該薬液注入パイプの引揚げプロセスにおいて保たれ
、したがって、スライムアップは比較的スムースに行わ
れるものの、該地盤に粘土層等がある場合には、回転さ
れつつ引揚げる薬液注入パイプに対する締付は力が大き
く、したがって、該間隙がほとんどなくなったり、或は
、狭小になるような場合があり、したがって、スライム
がチェックされ、薬液注入パイプに対する薬液の送給圧
が高くなり、施工がし難くなるという難点があるうえに
、スライムのＩＩ麿も上がり、スライムアップが困難に
なるために地上において吸引力を付加し、送給薬液の圧
力を、高めたり、スライムアップの負圧を大きくするた
めに、動力費が嵩むという不利点があった。<Problem to be solved by the invention> Therefore, when the ground is a sand layer or the like from the upper layer to the lower layer at a predetermined depth, the gap between the chemical injection pipe and the ground is such that the gap between the chemical injection pipe and the ground is The slime up is maintained during the lifting process, and therefore the slime-up occurs relatively smoothly. However, if there is a clay layer in the ground, the tightening force is large to tighten the chemical injection pipe that is being rotated and pulled up. There are cases where the gap is almost gone or becomes narrow, so slime is checked, and the supply pressure of the chemical to the chemical injection pipe becomes high, making construction difficult. The second level of slime also rises, making it difficult to get slime up. Therefore, suction power is added on the ground to increase the pressure of the chemical liquid being fed, and the negative pressure for slime up is increased, which increases the power cost. There were advantages.
又、更に、粘土層等が厚い場合には上記間隙がゼロに近
くなると経時的にスライムの１１度が上昇し、薬液の送
給圧を高くすることにより、地盤中におけるスライムの
＾圧増量を来たし、工事現場近辺の地盤が盛上がるとい
う欠点もあった。In addition, when the clay layer is thick, the 11 degrees of slime increases over time when the above-mentioned gap approaches zero, and by increasing the feeding pressure of the chemical solution, it is possible to suppress the increase in the pressure of slime in the ground. However, there was also the drawback that the ground near the construction site was raised.
更に、地盤中に超粘土や重粘上がある場合には、薬液の
噴出自体が出来なくなるという虞れもあった。Furthermore, if there is super clay or heavy viscosity in the ground, there is a risk that the chemical solution itself will not be able to be ejected.
この発明の目的は上述従来技術に基づく軟弱地盤の地盤
改良や止水壁、地中杭造成の際の粘土層等によるスライ
ムアップの困難性の問題点を解決すべき技術的課題とし
、地盤内部の層の性質の如何を問わず、スライムアップ
がスムースに行え、これにより地盤中へ所定の薬液を噴
出注入することが出来るようにして建設産業にお番プる
薬液注入技術利用分野に益する優れた地盤改良方法を提
供せんとするものである。The purpose of this invention is to solve the technical problem of the difficulty of slime up due to clay layer etc. when constructing soil improvement of soft ground, water stop wall, and underground pile based on the above-mentioned conventional technology. Regardless of the nature of the layer, slime-up can be carried out smoothly, and this makes it possible to spray and inject a specified chemical into the ground, benefiting the field of chemical injection technology that is popular in the construction industry. The purpose is to provide an excellent ground improvement method.
〈問題点を解決するための手段・作用〉上述目的に沿い
先述特許請求の範囲を要旨とするこの発明の構成は、前
述問題点を解決するために、対象とする所定の地盤に対
し薬液注入パイプをその内部の複重の薬液通路等を介し
て水を送給する等して所定深度まで削孔を行い、而して
、所定深疫に達した侵、該薬液注入パイプを引揚げつつ
その内部に形成されている複重通路の薬液通路に薬液を
送給し、所定部位に設けた噴射ノズルから側方に該薬液
を噴出して地盤に注入するようにし、而して、該薬液注
入パイプと地盤との間隙に形成される前記スライムを地
上に上昇させるプロセスにおいて、上昇する薬液注入パ
イプの該噴射ノズルのレベルより高いレベルに形成され
た希釈水噴射ノズルから該薬液注入パイプ内部の複重通
−路の一つの送水通路に対して供給される希釈水を該薬
液噴出に先んじて噴出し、したがって、後から上昇して
くるスライムは該希釈水に希釈されて濃度が低下され、
重粘上、超粘土等の薬液注入パイプに対する締付けがあ
っても狭小間隙がら該締付圧を緩めながらスムースにス
ライムアップすることが出来、したがって、スライムア
ップに対する吸引力や薬液に対する送給圧を高くするこ
となく、地盤中のスライムの圧力を下げ、地上での地盤
の盛上がり等も避けられるようにし、安定した地盤改良
が行えるようにした技術的手段を講じたものである。<Means/effects for solving the problem> In order to solve the above-mentioned problem, the structure of the present invention, which is based on the above-mentioned claims, is to inject a chemical liquid into a predetermined target ground. The pipe is drilled to a predetermined depth by supplying water through multiple chemical passages inside the pipe, and when the penetration reaches a predetermined depth, the chemical injection pipe is withdrawn. The chemical solution is fed into a double-layered chemical channel formed inside the structure, and is sprayed laterally from an injection nozzle provided at a predetermined location to be injected into the ground. In the process of raising the slime formed in the gap between the injection pipe and the ground to the ground, the inside of the chemical injection pipe is sprayed from a diluent water injection nozzle formed at a level higher than the level of the injection nozzle of the rising chemical injection pipe. The dilution water supplied to one water supply passage of the double passage is ejected prior to the ejection of the chemical solution, so that the slime that rises later is diluted by the dilution water and its concentration is reduced,
Even if the chemical liquid injection pipe is tightened due to heavy viscosity or super clay, it is possible to smoothly slime up while loosening the tightening pressure through a narrow gap. Therefore, the suction force against slime up and the feeding pressure for the chemical liquid can be reduced. This technology has been implemented to reduce the pressure of slime in the ground, avoid the rise of the ground above the ground, and enable stable ground improvement without raising the height.
〈実施例〉
次に、この発明の１実施例を図面に基づいて説明すれば
以下の通りである。<Example> Next, an example of the present invention will be described below based on the drawings.
図示Ｍ様において、１は薬液注入パイプであり、図示し
ない地盤の地上にて、同じく図示しない台車のリーダに
沿って最上端に設けられるスイーベルジョイント２の下
端に削孔中順次連結されるジヨイントパイプ３．３・・
・をネジ連結継足しすることにより、所定良さにされ、
その先端部に於いては、この発明の中心を成す希釈水注
入のための希釈水送給部４とその先端にネジ螺合連結−
される削孔部５があり、該削孔部５の先端にはクラウン
６と薬液噴射ノズル７が在来態様同様に設けられており
、上記スイーベルジョイント２からの薬液８、空気９を
別経路を介して送給され、該噴射ノズル７からは側方に
該薬液８とその回りを空気９を包むような状態で噴出し
、地盤中に注入するようにされている。In Mr. M shown in the figure, 1 is a chemical injection pipe, which is sequentially connected to the lower end of a swivel joint 2 provided at the top end along the leader of a cart (also not shown) on the ground (not shown) during drilling. Pipe 3.3...
・By adding a screw connection, the specified quality is achieved,
At its tip, there is a dilution water supply section 4 for injecting dilution water, which forms the center of this invention, and a threaded connection to the tip.
A crown 6 and a chemical liquid injection nozzle 7 are provided at the tip of the hole drilled part 5 in the same manner as in the conventional embodiment, and the chemical liquid 8 and air 9 from the swivel joint 2 are routed through separate routes. From the injection nozzle 7, the chemical solution 8 is ejected laterally in a state surrounding the chemical solution 8 and air 9, and is injected into the ground.
したがって、次述するように、希釈水送給部４までは薬
液注入バイブ１の内部は一種のＥ重管構造にされて各々
別通路で薬液８、空気９、希釈水１０を送給するように
され、削孔部５では該薬液８と空気９が別経路で送給さ
れて噴射ノズル７より中央に薬液８をその回りに空気９
が同心的に側方へ薬′ａ８を包んで噴射するようにされ
てい゛る。Therefore, as will be described below, the interior of the chemical liquid injection vibrator 1 up to the dilution water supply section 4 has a kind of E-tube structure, and the chemical liquid 8, air 9, and dilution water 10 are fed through separate passages. The chemical liquid 8 and air 9 are fed through separate routes in the drilling section 5, and the chemical liquid 8 is sent to the center from the injection nozzle 7, and the air 9 is distributed around it.
The medicine is concentrically wrapped around the medicine 'a8' and sprayed laterally.
尚、該薬液注入パイプ１のジヨイント部構造や削孔部５
の１１重管構造は既に出願人の先願発明等において周公
知にされているものである。In addition, the joint part structure and the drilled part 5 of the chemical injection pipe 1
The 11-ply tube structure is already well known in the applicant's prior invention.
而して、該希釈水送給部４は、第１図に詳示する様に、
上部には上記ジヨイントバイブ３に対す′ る連結メ
ネジ１１が、又、下端には上記削孔部５に対する連結オ
ネジ１２が刻設されており、そのユニットは上部管１３
と下部管１４がネジ１５を介して連結一体化されており
、該下部管１−４は外管１６と内管１７がハニカム１８
を介して一体連結され、該内管１１内は薬液８に対する
送給孔１９が形成され、又、該内管１７と外管１６との
間には空気の送給孔２０が断面リング状に形成されてい
る。As shown in detail in FIG. 1, the dilution water supply section 4 has
A connecting female screw 11 for the joint vibrator 3 is provided at the upper part, and a male connecting screw 12 for connecting to the drilled part 5 at the lower end, and the unit is connected to the upper pipe 13.
and a lower tube 14 are connected and integrated through a screw 15, and the lower tube 1-4 has an outer tube 16 and an inner tube 17 connected to a honeycomb 18.
A feeding hole 19 for the chemical liquid 8 is formed in the inner tube 11, and an air feeding hole 20 having a ring-shaped cross section is formed between the inner tube 17 and the outer tube 16. It is formed.
而して、上部管１３内に於いては、該下部管１４の内管
１７が上紙しており、咳内管１７と外管２１との間には
同心状に中管２２が該内管１７に対しハニカム２３を介
して固設されており、下部管１４の外管１６に対して０
−リング２４を介してシール状態に接し、該内管１７と
の間には空気送給孔２０を断面リング状に介設形成して
おり、又、咳中管２２と外管２１との間、には゛ハニカ
ム２５を有して該中管２２が固定支持されるようにされ
、該中管２２と外管２１との間には前記希釈水送給孔２
６が断面リング状に形成され、下部管１４と該中管２２
が形成する底２１で行き止まりにされている。The inner tube 17 of the lower tube 14 is placed above the upper tube 13, and the inner tube 22 is concentrically arranged between the inner tube 17 and the outer tube 21. It is fixed to the pipe 17 via the honeycomb 23, and is fixed to the outer pipe 16 of the lower pipe 14.
- An air supply hole 20 having a ring-shaped cross section is interposed between the inner tube 17 and the inner tube 17 in a sealed state through the ring 24, and between the cough tube 22 and the outer tube 21. , has a honeycomb 25 to fixedly support the inner tube 22, and the dilution water feed hole 2 is provided between the inner tube 22 and the outer tube 21.
6 is formed into a ring shape in cross section, and the lower tube 14 and the middle tube 22
It is a dead end at the bottom 21 formed by.
したがって、該希釈水送給部４の上部管１３は三重構造
にされてその上部に連結解離されるジョンドパイブ３と
共に三重構造にされて外側に希釈水１０を、又、中管２
２に空気９を、そして、中央に薬液８を送給するように
され、又、下部管１４が二重構造にされて外側に空気９
を中央に薬液８を送給するようにされている。Therefore, the upper pipe 13 of the dilution water supply section 4 has a triple structure, and the upper pipe 3 has a triple structure, and the upper pipe 3 is connected to and detached from the upper pipe 13 to supply the dilution water 10 to the outside.
The air 9 is supplied to the tube 2 and the chemical liquid 8 is supplied to the center, and the lower tube 14 has a double structure so that the air 9 is supplied to the outside.
The chemical solution 8 is fed to the center.
而して、希釈水送給部４のＥ部管１３の外管２１の外側
面には長手方向、即ち、軸方向に沿って４枚のフィン２
８．２８・・・が一体溶接固定されており、その厚みの
分には楕円状の希釈水噴射ノズル２９が穿設され、その
内部には噴射ノズル本体３０が固設されて、そのノズル
穴３１は該噴射ノズル本体３０の外側に対して行き止ま
りになっており、該外管２１内に開口しており、前記希
釈水送給孔２５に連通して該噴射ノズル２９に円筒状の
ゴム製のチェックバルブ３２により外側からのスライム
や土砂の内部への侵入を阻止すると共に、希釈水１０を
その圧力を介して該希釈水噴射ノズル２９から側方に、
第２図に示す様に、噴出することが出来るように形成さ
れている。Four fins 2 are provided on the outer surface of the outer tube 21 of the E section tube 13 of the dilution water supply section 4 along the longitudinal direction, that is, the axial direction.
8.28... are integrally welded and fixed, and an elliptical dilution water injection nozzle 29 is bored in the thickness thereof, and an injection nozzle main body 30 is fixed inside it, and the nozzle hole 31 is a dead end on the outside of the injection nozzle main body 30, opens into the outer tube 21, communicates with the dilution water supply hole 25, and connects the injection nozzle 29 with a cylindrical rubber tube. The check valve 32 prevents slime and dirt from entering the interior from the outside, and the dilution water 10 is laterally directed from the dilution water injection nozzle 29 through its pressure.
As shown in FIG. 2, it is formed so that it can eject.
上述薬液注入バイブ１において、所定の地盤に前記台車
をその地上にセットし、図示しない回転装置、及び、静
圧付与装置により、該薬液注入パイプ１をジヨイントバ
イブ３．３を継足しながら先端の削孔部５のクラウン６
を介して削孔していく。In the above-mentioned chemical liquid injection vibrator 1, the cart is set on a predetermined ground, and the tip of the chemical liquid injection pipe 1 is connected to the joint vibrator 3.3 using a rotating device and a static pressure applying device (not shown). Crown 6 of drilled part 5 of
The hole is drilled through the hole.
この場合、在来態様同様に上端のスイーベルジョイント
２より、空気９、或は、希釈水１０をジヨイントバイブ
３．３・・・、及び、希釈水送給部４の内管１７内に薬
液に代えて送給して削孔部５の先端クラウン６から下方
に噴出して削孔を助勢する。In this case, air 9 or dilution water 10 is supplied from the swivel joint 2 at the upper end to the joint vibes 3, 3, and the chemical solution into the inner pipe 17 of the dilution water supply section 4, as in the conventional embodiment. Instead, it is fed and ejected downward from the tip crown 6 of the hole drilling section 5 to assist drilling.
而して、薬液注入パイプ１が地盤１０の所定深度に達す
ると、該薬液注入パイプ１を引揚げながら上記スイーベ
ルジョイント２を切り換えて、各ジヨイントパイプ３の
内管１７に、自矢印に示す様に所定の薬液を送給すると
共に、該内管１１と中管２２と該内管１７との間に空気
９を送給し、削孔部５の噴射ノズル７から側方に対し中
央に薬液８をその周囲を囲むように空気９を囲繞させて
、第２図に示す様に、薬液を側方噴出し、地盤中に注入
する。When the chemical liquid injection pipe 1 reaches a predetermined depth in the ground 10, the swivel joint 2 is switched while pulling up the chemical liquid injection pipe 1, and the inner pipe 17 of each joint pipe 3 is inserted into the inner pipe 17 as shown by the self-arrow. At the same time, the air 9 is fed between the inner tube 11, the middle tube 22, and the inner tube 17, and the air 9 is fed from the injection nozzle 7 of the drilled hole 5 to the center from the side. The chemical liquid 8 is surrounded by air 9, and as shown in FIG. 2, the chemical liquid is spouted to the side and injected into the ground.
而して、この間、先述した如く、薬液注入パイプ１より
側方噴出する薬液８は地盤中に注入されるが、そのプロ
セスにおいて地盤中の地下水や土砂とスライム化して薬
液注入パイプ１と図示しない地盤の間隙から地上にスラ
イムアップしていく。During this time, as mentioned above, the chemical solution 8 spouting laterally from the chemical solution injection pipe 1 is injected into the ground, but in the process, it becomes slime with the ground water and earth in the ground, and becomes the chemical solution injection pipe 1 (not shown). Slime rises to the ground through gaps in the ground.
さりながら、先述した如く、該地盤中に重粘土層や重粘
土層がある場合には、該薬液注入パイプの外側面に大き
な土圧を与え、該間隙を小さくし粘性のあるスライムア
ップを防止しようとする。However, as mentioned above, if there is a heavy clay layer or heavy clay layer in the ground, large earth pressure is applied to the outer surface of the chemical injection pipe to reduce the gap and prevent viscous slime up. try to.
さりながら、この発明においては、薬液注入パイプ１内
に薬液８、及び、空気９を送給すると共に、外管２１と
中管２２どの間に希釈水１０を送給することにより、送
給された希釈水１０は希釈水送給部４の底２７に行き止
まりにされて各フィン２Ｂの希釈水噴射ノズル２９の噴
射ノズル本体・３０のノズル穴３１からゴム製のチェッ
クパルプ３２をその弾性に抗してこれを拡開し、噴射ノ
ズル２９より側方に第２図に示す様に噴出する。However, in this invention, the chemical liquid 8 and air 9 are fed into the chemical liquid injection pipe 1, and the dilution water 10 is fed between the outer pipe 21 and the middle pipe 22, so that the liquid is fed. The dilution water 10 is dead-ended at the bottom 27 of the dilution water supply section 4, and the rubber check pulp 32 is passed through the nozzle hole 31 of the injection nozzle body 30 of the dilution water injection nozzle 29 of each fin 2B against its elasticity. Then, it is expanded and ejected laterally from the injection nozzle 29 as shown in FIG.
而して、該希釈水圧は該噴射ノズル２９のチェックバル
ブ３２を押し開く程度であり、地盤を削孔する程ではな
いために、直ちに地盤との間隙に噴出する。The dilution water pressure is sufficient to push open the check valve 32 of the injection nozzle 29, and is not sufficient to drill a hole in the ground, so that it is immediately ejected into the gap between the water and the ground.
そして、該削孔４の外管２１に設けた軸方向のフィン２
８．２８の回転によりスライムと混合攪拌し、該スライ
ムの濃度を低下させてスライムアップがし易いようにす
る。Then, axial fins 2 provided on the outer tube 21 of the drilled hole 4
8. Mix and stir with the slime by rotating at 28 degrees to lower the concentration of the slime and make it easier to slime up.
したがって、スライムアップはスムースに保たれ、地上
からの間隙に対する吸引作用がなくても地上まで上貸し
、或は、僅かに吸引作用を与えるだけで間隙からのスラ
イムアップは容易に行われる。Therefore, the slime-up is kept smooth, and the slime-up from the gap can be easily carried out to the ground even without suction from the ground, or by only applying a slight suction.
そして、第２図に示す様に、薬液注入パイプ１が回転し
ながら上昇していくことにより、削孔部５の噴射ノズル
７からの間隙の噴出レベルよりも上位のレベルに希釈水
１０が側方に噴出するために、該削孔部５の噴射ノズル
７からの薬液噴射によるスライムはその上位の希釈水１
０の希釈によりその濃度を低くされてスムースに上昇し
ていくことが保証される。As shown in FIG. 2, as the chemical injection pipe 1 rotates and rises, the dilution water 10 reaches a level higher than the jetting level in the gap from the jetting nozzle 7 of the drilled hole 5. Since the slime is ejected in the direction, the slime caused by the chemical injection from the injection nozzle 7 of the drilled hole 5 is diluted with the dilution water 1 above it.
A dilution of 0 ensures that the concentration is low and rises smoothly.
したがって、薬液注入パイプ１に対する薬液送給圧を強
くしなくても設定圧力で送給することにより、噴射ノズ
ル１からの薬液８は終始所定圧で側方噴出し、地盤中に
注入され、所定の止水壁や地中杭が造成される。Therefore, by feeding the chemical liquid at the set pressure without increasing the chemical liquid supply pressure to the chemical liquid injection pipe 1, the chemical liquid 8 from the injection nozzle 1 is spouted sideways at a predetermined pressure from beginning to end, is injected into the ground, and is injected into the ground at a predetermined level. Water cutoff walls and underground piles will be constructed.
尚、この発明の実施態様は上述実施例に限るものでない
ことは勿論であり、例えば、上記希釈水の側方噴出は１
段のみならず、２段、３段等にしたり種々の態様が採用
可能である。It goes without saying that the embodiments of the present invention are not limited to the above-mentioned embodiments. For example, the side jetting of the dilution water is
It is possible to adopt various configurations such as not only tiers but also 2 tiers, 3 tiers, etc.
〈発明の効果〉
以上、この発明によれば、基本的に、地盤中に止水壁や
地中杭を形成させる等の地盤改良において、地盤中に重
粘土層や重粘土層がある場合に、薬液注入パイプの噴射
ノズルから側方噴出して地盤中に注入する薬液が地盤の
地下水や土砂と混り合ってスライムを形成するプロセス
にて該スライムを地表に地盤と薬液注入パイプの間隙を
介して上昇させる過程で該間隙が挟まり、薬液注入パイ
プを締め付け、結束的に、スライムアップが出来なくな
るような虞れを希釈水がスライムを希釈し、その濃度を
低下させることによりスムースに通過出来るようにし、
又、地盤を緩まき、薬液注入パイプの地盤に対する間隙
が常に確保され、したがって、スライムアップがスムー
スに行われるという効果があり、又、これにより薬液注
入バイブ中送給する薬液の圧力をがけたりせずに済む効
果がある。<Effects of the Invention> As described above, according to the present invention, basically, when there is a heavy clay layer or a heavy clay layer in the ground in ground improvement such as forming a water stop wall or underground pile in the ground, In the process where the chemical liquid is sprayed laterally from the injection nozzle of the chemical injection pipe and injected into the ground, it mixes with groundwater and earth and sand to form slime. There is a risk that the gap gets caught in the process of raising the slime, tightening the chemical injection pipe, and making it impossible to get the slime up.The dilution water dilutes the slime and lowers its concentration, allowing it to pass through smoothly. So,
In addition, by spreading the ground loosely, a gap between the chemical injection pipe and the ground is always ensured, which has the effect of smooth slime-up, and this also allows pressure to be applied to the chemical liquid being delivered during the chemical injection vibrator. It has the effect of not having to do it.
又、それにより、動力が少く、したがって、ランニング
コストが安くなるという利点もあり、又、地盤の盛上が
り等も形成されずに済むという優れた効果が奏される。Moreover, there is an advantage that the power required is small and therefore the running cost is low, and there is also an excellent effect that the formation of heaving of the ground etc. is avoided.
又、該薬液の送給圧を上げなくて済むために、設計通り
のサイズの地盤改良が行われ地下水脈を汚染させたりす
ることなく、公害問題も発生しないという優れた効果が
奏される。Furthermore, since it is not necessary to increase the feeding pressure of the chemical solution, the ground improvement is carried out to the designed size, and there is an excellent effect that the underground water vein is not contaminated and no pollution problem occurs.
図面はこの発明の１実施例の説明図であり、第１図は第
２図の部分拡大断面図、第２図は薬液注入パイプの連結
状態概略側面図である。The drawings are explanatory diagrams of one embodiment of the present invention, and FIG. 1 is a partially enlarged cross-sectional view of FIG. 2, and FIG. 2 is a schematic side view of the chemical liquid injection pipe in a connected state.
Claims (1)
噴射ノズルより地盤中に薬液を噴出注入すると共に薬液
注入パイプと削孔との間隙よりスライムアップを行う地
盤改良方法において、上記薬液の噴出レベルより上位レ
ベルで希釈水を上記間隙に先行して噴出させてスライム
濃度を低下させるようにしたことを特徴とする地盤改良
方法。In a ground improvement method in which a chemical injection pipe is inserted into a borehole in the ground and then pulled up, the chemical liquid is injected into the ground from an injection nozzle and slime is raised from the gap between the chemical injection pipe and the excavation hole. A ground improvement method characterized in that the slime concentration is reduced by ejecting dilution water in advance into the gap at a level higher than the above level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5828185A JPS61221409A (en) | 1985-03-25 | 1985-03-25 | Ground improvement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5828185A JPS61221409A (en) | 1985-03-25 | 1985-03-25 | Ground improvement method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61221409A true JPS61221409A (en) | 1986-10-01 |
Family
ID=13079801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5828185A Pending JPS61221409A (en) | 1985-03-25 | 1985-03-25 | Ground improvement method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61221409A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100484906B1 (en) * | 2004-05-18 | 2005-04-25 | 원용문 | The foundation an excavator adhesion air hammer |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5827364A (en) * | 1981-08-10 | 1983-02-18 | Semiconductor Energy Lab Co Ltd | Insulated gate type field effect semiconductor device |
-
1985
- 1985-03-25 JP JP5828185A patent/JPS61221409A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5827364A (en) * | 1981-08-10 | 1983-02-18 | Semiconductor Energy Lab Co Ltd | Insulated gate type field effect semiconductor device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100484906B1 (en) * | 2004-05-18 | 2005-04-25 | 원용문 | The foundation an excavator adhesion air hammer |
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