JPH0565650B2 - - Google Patents
Info
- Publication number
- JPH0565650B2 JPH0565650B2 JP26126087A JP26126087A JPH0565650B2 JP H0565650 B2 JPH0565650 B2 JP H0565650B2 JP 26126087 A JP26126087 A JP 26126087A JP 26126087 A JP26126087 A JP 26126087A JP H0565650 B2 JPH0565650 B2 JP H0565650B2
- Authority
- JP
- Japan
- Prior art keywords
- ground
- slime
- grout
- cement
- air
- 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
- 239000011440 grout Substances 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 10
- 238000010276 construction Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 6
- 239000004568 cement Substances 0.000 description 18
- 238000002347 injection Methods 0.000 description 8
- 239000007924 injection Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 239000008267 milk Substances 0.000 description 8
- 210000004080 milk Anatomy 0.000 description 8
- 235000013336 milk Nutrition 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000007796 conventional method Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は地盤改良工法に関する。[Detailed description of the invention] Industrial applications The present invention relates to a ground improvement method.
従来の技術とその問題点
従来、地盤改良工法として、地中で横向きに空
気を沿わせたジエツト噴流を噴射して地盤を切削
しつつ上記空気のエアリフト効果により切削ずり
をスライムとして地表に排除して地中に空間を形
成しながら、この空間にグラウト材を注入充填し
て行くような、所謂ジエツトグラウト工法が提案
されている。ところがこのような地盤改良工法に
於ては地表に排除のスライム中に多量のグラウト
材が含有され、その含有量は注入充填量の50〜80
%にも達するといわれ、これではグラウト材のロ
スが大きいのみならず、含有グラウト材のためス
ライムが固結し、施工現場よりの搬出に破砕など
の繁雑な手数を要したり、更には投棄場所によつ
ては公害原因を招くなどの問題点があつた。Conventional technology and its problems Conventionally, as a ground improvement method, a jet jet of air is injected horizontally into the ground to cut the ground, and the airlift effect of the air removes the cutting shear to the ground surface as slime. A so-called jet grouting method has been proposed, in which a space is formed underground and grout is injected into the space. However, in this ground improvement method, a large amount of grout material is contained in the slime removed to the ground surface, and the content is 50 to 80% of the amount of injection filling.
It is said that this can reach up to 30% of the total amount of grout, and not only does this result in a large loss of grout, but the slime also solidifies due to the grout contained in it, requiring complicated steps such as crushing it to remove it from the construction site, and even causing waste to be dumped. In some places, there were problems such as causing pollution.
本発明はこのような従来の問題点を一掃するこ
とを目的としてなされたものである。 The present invention has been made with the aim of eliminating such conventional problems.
問題点を解決するための手段
本発明は、地中で横向きに空気を沿わせたジエ
ツト噴流を噴射して地盤を切削しつつ上記空気の
エアリフト効果により切削ずりをスライムとして
地表に排除して地中に空間を形成しながら、この
空間にグラウト材を注入充填していく地盤改良工
法において、地表に排除されたスライムに含まれ
るグラウト材を分離しつつ、これを地中のグラウ
ト材充填部に返送し再充填することを特徴とする
地盤改良工法に係る。Means for Solving the Problems The present invention cuts the ground by injecting a jet stream of air along the sideways underground, and removes the cutting shear as slime to the ground surface by the air lift effect of the air. In the ground improvement method, which creates a space inside and injects grout into the space, the grout contained in the slime that has been removed to the ground surface is separated and then poured into the grout filling section underground. This relates to a ground improvement method that is characterized by being returned and refilled.
実施例
以下に本発明の一実施例を添附図面にもとづき
説明すると次の通りである。Embodiment An embodiment of the present invention will be described below based on the accompanying drawings.
本発明工法の実施に際しては、図示のように、
施工対象の地盤1にガイドホール2が削孔され、
このホール2内に三重管ロツド3が建込まれる。 When implementing the construction method of the present invention, as shown in the diagram,
A guide hole 2 is drilled in the ground 1 to be constructed,
A triple pipe rod 3 is built inside this hall 2.
次に上記三重管ロツド3内に、導管4よりの超
高圧水と、導管5よりの圧縮空気と、更に導管6
よりのグラウト材例えばセメントミルクがスイベ
ルジヨイント部7を経て個別に供給され、このう
ち超高圧水と圧縮空気は上記ロツド3下部の高圧
ノズル部8より同時に地中に噴射され、一方グラ
ウト材はロツド3の下端部、即ち上記高圧ノズル
8よりも低い位置に設けられた注入ノズル9より
地中に噴入される。 Next, in the triple pipe rod 3, ultra-high pressure water from the conduit 4, compressed air from the conduit 5, and further conduit 6 are supplied.
A grouting material such as cement milk is supplied individually through the swivel joint section 7, and ultra-high pressure water and compressed air are simultaneously injected into the ground from the high-pressure nozzle section 8 at the bottom of the rod 3. It is injected into the ground from an injection nozzle 9 provided at the lower end of the rod 3, that is, at a position lower than the high-pressure nozzle 8.
而して、ロツド3をコラムマシン10の作動を
して回転しつつクレーン(図示せず)の作動によ
り徐々に引上げて行くと、高圧ノズル8より地中
に同時噴射された超高圧水と圧縮空気は改良範囲
1a内の地盤を切削し、切削ずりは上記圧縮空気
のエアリフト効果によりスライムとしてロツド3
の外周部のガイドホール2を経て地表部のスライ
ム留め11内に排除され、この排除部分に注入ノ
ズル9よりグラウト材12が注入充填されて行
き、茲に地盤改良の目的が達成される。このよう
な地盤改良工法そのもは従来工法と実質的に異な
る所がない。 When the rod 3 is rotated by the operation of the column machine 10 and gradually pulled up by the operation of a crane (not shown), ultra-high pressure water and compressed water are simultaneously injected into the ground from the high pressure nozzle 8. The air cuts the ground within the improved area 1a, and the cutting shear is turned into slime by the air lift effect of the compressed air.
The slime is removed through the guide hole 2 on the outer periphery of the grout into the slime retainer 11 on the ground surface, and the removed portion is injected and filled with grout material 12 from the injection nozzle 9, thereby achieving the purpose of ground improvement. This ground improvement method itself is not substantially different from conventional methods.
このようなジエツトグラウトによる地盤改良工
法に於ては、地表に排除されるスライム中には、
多量のセメントミルクが含まれる。その理由は圧
縮空気を伴うジエツト水噴出により地盤切削状態
は切削部とセメント注入部が攪乱状態であり、切
削スライム中にセメント材が混入するのは避けら
れない。よつて供給セメント量は排出スライムに
混入する量を見込み改良に要する以上の供給量を
要し、供給量の50〜80%のセメントミルクはスラ
イム中に含まれて地表に排除される。 In this ground improvement method using jet grouting, the slime removed to the ground surface contains
Contains large amounts of cement milk. The reason for this is that the ground cutting condition is disturbed by the jet water jet accompanied by compressed air, and the cutting part and the cement injection part are in a state of disturbance, and it is inevitable that cement material will be mixed into the cutting slime. Therefore, the amount of cement to be supplied must exceed the amount required for improvement considering the amount mixed in the discharged slime, and 50 to 80% of the supplied amount of cement milk is contained in the slime and removed to the ground surface.
本発明工法は、スライム中に含まれて地表に排
除されるセメントミルクを分離回収し、循環使用
することを特徴としている。 The construction method of the present invention is characterized in that the cement milk contained in the slime and removed to the ground surface is separated and recovered and reused for circulation.
即ち本発明工法に於ては、上記ロツド3ひいて
は地盤改良を継続しつつ地表部のスライム溜め1
1に排除されて来たスライムをサンドポンプ13
の作動をしてポンプアツプしつつ導管22を通じ
で土砂分離装置例えば振動フルイ14に導き、土
砂はタンク15に、セメント部分を含む液成分
は、シユート16を介して沈降濃縮槽17に、そ
れぞれ分離回収する。 That is, in the construction method of the present invention, the slime reservoir 1 on the ground surface is
Sand pump 13 the slime that was eliminated in 1.
While pumping up the soil, it is guided to a soil separator, for example, a vibrating sieve 14, through a conduit 22, and the soil and sand are sent to a tank 15, and the liquid components, including cement, are sent to a settling tank 17 via a chute 16, where they are separated and recovered. do.
タンク15に分離回収された土砂は殆んどセメ
ント成分を含まないので固結することがなくな
り、破砕などの必要性なしに常法手段の適用によ
り投棄場所へ搬出され投棄される。 The earth and sand separated and collected in the tank 15 contains almost no cement component, so it does not solidify, and is carried to a dumping site and dumped by applying conventional methods without the need for crushing or the like.
一方沈降濃縮槽17に於ては、比較的比重の大
きいセメント(比重3.1)が速やかに沈降し、上
部の水と、下部のセメント成分とに分離され、分
離された水は、槽10に付設された溢流管18よ
り系外に排出される。この排水中には槽10内で
の滞留時間にもよるが、僅かのセメント成分その
他の浮遊物が含有される場合があるが、その含有
率は低く、そのまま放流しても河川などを汚染す
る虞れはない。また槽10の底部からは沈降濃縮
のされたセメント成分がセメントミルクの状態
で、循環ポンプ18の作動をして導管19を経て
循環用パイプ20に向けて圧送される。 On the other hand, in the settling tank 17, cement with a relatively high specific gravity (specific gravity 3.1) quickly settles and is separated into water in the upper part and cement components in the lower part, and the separated water is added to the tank 10. It is discharged out of the system through the overflow pipe 18. Depending on the residence time in the tank 10, this wastewater may contain a small amount of cement components and other suspended matter, but the content is low and will pollute rivers, etc. even if it is discharged as is. There is no danger. Further, from the bottom of the tank 10, the sedimented and concentrated cement components are pumped in the form of cement milk through the conduit 19 toward the circulation pipe 20 by the operation of the circulation pump 18.
循環用パイプ20は改良範囲1a内例えばその
周辺側りの部分に挿入され、下端部に改良範囲1
aの中心方向に向けられた噴射ノズル21を持つ
ている。図ではパイプ20を一本備えた場合が示
されているが複数本を円周方向に等間隔に備える
ようにしてもよい。 The circulation pipe 20 is inserted into the improvement area 1a, for example, in the peripheral side thereof, and the improvement area 1a is inserted into the improvement area 1a at the lower end.
It has an injection nozzle 21 directed toward the center of a. Although the figure shows a case in which one pipe 20 is provided, a plurality of pipes may be provided at equal intervals in the circumferential direction.
循環用パイプ20の下端の噴射ノズル21から
は、パイプ20内に圧送されて来た上記再生セメ
ントミルクが中心方向に向けて噴射され、循環使
用される。このようにセメントミルクを循環使用
することにより、循環使用しない従来方式の場合
よりも、供給量を20〜40%少なくして、同等の地
盤改良効果が得られる。 From the injection nozzle 21 at the lower end of the circulation pipe 20, the recycled cement milk that has been pressure-fed into the pipe 20 is injected toward the center and used for circulation. By recycling cement milk in this way, the same ground improvement effect can be achieved with a 20 to 40% lower supply amount than in the conventional method that does not recycle cement milk.
効 果
このように本発明工法に於ては、グラウト材を
準監視要する方式であるので、グラウト材の消費
量を削減できると共に使用ロスが少なくなり施工
費の低減化に寄与でき、また投棄されるスライム
成分中に含有されるセメント成分を減少できるの
で、スライムが固結することがなくなり、スライ
ムの搬出投棄の手数を低減できるなどの特徴を有
する。Effects As described above, since the method of the present invention requires quasi-monitoring of the grout material, it is possible to reduce the consumption of grout material, reduce usage loss, contribute to lower construction costs, and reduce the amount of grout material being thrown away. Since the cement component contained in the slime component can be reduced, the slime will not solidify, and the number of steps involved in transporting and dumping the slime can be reduced.
図面は本発明の一実施状況を示す概略説明図で
ある。
1は地盤、2はガイドホール、3は三重管ロツ
ド、4,5及び6は導管、7はスイベルジヨイン
ト、8は高圧ノズル部、9は注入ノズル、10は
コラムマシン、11はスライム溜め、12はグラ
ウト材、13はサイドポンプ、14は振動フル
イ、15はタンク、16はシユート、17は沈降
濃縮槽、18は溢流管、19は導管、20は循環
ポンプ、21は噴射ノズルである。
The drawing is a schematic explanatory diagram showing one implementation situation of the present invention. 1 is the ground, 2 is a guide hole, 3 is a triple pipe rod, 4, 5 and 6 are conduits, 7 is a swivel joint, 8 is a high pressure nozzle part, 9 is an injection nozzle, 10 is a column machine, 11 is a slime reservoir, 12 is a grout material, 13 is a side pump, 14 is a vibrating sieve, 15 is a tank, 16 is a chute, 17 is a settling tank, 18 is an overflow pipe, 19 is a conduit, 20 is a circulation pump, and 21 is an injection nozzle. .
Claims (1)
を噴射して地盤を切削しつつ上記空気のエアリフ
ト効果により切削ずりをスライムとして地表に排
除して地中に空間を形成しながら、この空間にグ
ラウト材を注入充填していく地盤改良工法におい
て、地表に排除されたスライムに含まれるグラウ
ト材を分離しつつ、これを地中のグラウト材充填
部に返送し再充填することを特徴とする地盤改良
工法。1 While cutting the ground by injecting a jet stream of air along the sideways underground, the air lift effect of the air removes the cutting shear to the ground surface as slime, creating a space underground. In a ground improvement method in which grout is injected and filled, the grout contained in the slime removed to the ground surface is separated and then returned to the grout filling section underground for refilling. Improved construction method.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP26126087A JPH01102122A (en) | 1987-10-15 | 1987-10-15 | Ground improving work |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP26126087A JPH01102122A (en) | 1987-10-15 | 1987-10-15 | Ground improving work |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH01102122A JPH01102122A (en) | 1989-04-19 |
JPH0565650B2 true JPH0565650B2 (en) | 1993-09-20 |
Family
ID=17359358
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP26126087A Granted JPH01102122A (en) | 1987-10-15 | 1987-10-15 | Ground improving work |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH01102122A (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07122261B2 (en) * | 1989-12-25 | 1995-12-25 | 株式会社エヌ、アイ、ティ | Ground hardening agent injection injection device having injection nozzle of triple structure and injection method therefor |
JPH07111052B2 (en) * | 1990-06-01 | 1995-11-29 | 昌平 千田 | Ground improvement or strengthening method |
WO1992021825A1 (en) * | 1991-05-31 | 1992-12-10 | Chichibu Cement Kabushiki Kaisha | Construction method of improving or strengthening ground |
KR100476905B1 (en) * | 2002-08-30 | 2005-03-17 | 주식회사 제일종합통상 | Apparatus for transferring slime for a slime pump and method for transferring slime using the same |
-
1987
- 1987-10-15 JP JP26126087A patent/JPH01102122A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPH01102122A (en) | 1989-04-19 |
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