JPH01154912A - Method and apparatus for improving peaty ground - Google Patents
Method and apparatus for improving peaty groundInfo
- Publication number
- JPH01154912A JPH01154912A JP31100487A JP31100487A JPH01154912A JP H01154912 A JPH01154912 A JP H01154912A JP 31100487 A JP31100487 A JP 31100487A JP 31100487 A JP31100487 A JP 31100487A JP H01154912 A JPH01154912 A JP H01154912A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- flow path
- ground
- crown
- rod
- 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
- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000002347 injection Methods 0.000 claims abstract description 39
- 239000007924 injection Substances 0.000 claims abstract description 39
- 239000000463 material Substances 0.000 claims description 19
- 239000003415 peat Substances 0.000 claims description 8
- 239000002689 soil Substances 0.000 claims description 4
- 239000011440 grout Substances 0.000 abstract 2
- 239000004848 polyfunctional curative Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000003756 stirring Methods 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002657 fibrous material Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
Description
【発明の詳細な説明】
(イ)産業上の利用分野
本発明は含水比率300%〜10009Aに達する北海
道ピーI・層のような泥炭地盤等を対象とする地盤改良
方法とその装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a ground improvement method and device for peat ground such as the Hokkaido Pea I layer, which has a water content of 300% to 10009A. be.
(ロ)従来の技術
従来、含水比率が極めて高い泥炭地盤の改良については
セメント・石灰などの粉体を地盤にそのまま投入し攪拌
翼によって泥土と機械的に攪拌することにより反応硬化
させて改良する方法と補充的に注入管による硬化材の噴
射注入による方法が行われてきた。(b) Conventional technology Conventionally, to improve peat ground with extremely high moisture content, powder such as cement or lime is directly poured into the ground and mechanically stirred with the mud using a stirring blade, causing it to react and harden. In addition to this method, a method of injecting a hardening material through an injection tube has been used.
(ハ)発明が解決しようとする問題点
上述のような粉体の投入による攪拌の方法は使用機械が
非常に大型のものとなり、設置作動が大掛かりにならざ
るを得なかった。(c) Problems to be Solved by the Invention The method of stirring by adding powder as described above requires a very large machine and requires extensive installation and operation.
また、注入管によるスラリー注入と違って改良深度にも
限界があり、注入管改良に比較して浅い部分に限られて
、基本的な問題を残こさざるを得なかった。In addition, unlike slurry injection using an injection pipe, there is a limit to the depth of improvement, and the improvement is limited to shallow areas compared to injection pipe improvement, leaving fundamental problems unavoidable.
一方、注入管挿入による改良も試みられてきたが、強力
な攪拌手段がないので従来から提唱されている噴流攪拌
によらざるを得す、そのためには注入管の回転作動と硬
化材の高圧圧送が前提となるため、注入管の径に限界が
あり、これに装備されなければならない噴射ノズルの径
及び長さにも制約を生ずることとなる。従って地盤中に
噴射される硬化材の噴射圧と一度に噴射される噴射量に
限界があった。このため、地盤1立方米あたりに注入さ
れる硬化材の量を増加させることができず、改良地盤の
強度は極めて低いものとならざるを得なかった。On the other hand, attempts have been made to improve the process by inserting an injection tube, but since there is no powerful stirring means, the conventional method of jet agitation has to be used. Since this is a prerequisite, there is a limit to the diameter of the injection pipe, and this also places restrictions on the diameter and length of the injection nozzle that must be installed there. Therefore, there are limits to the injection pressure of the hardening material that is injected into the ground and the amount that can be injected at one time. For this reason, it was not possible to increase the amount of hardening material injected per cubic meter of ground, and the strength of the improved ground had to be extremely low.
(ニ)問題点を解決するための手段
本発明は以上の問題点に対処するため、注入管流路から
ロッドクラウンに承継される流路を斜め下方に流下させ
て側方噴射ノズルの流入部をセットバックさせることに
より、ロッドの通常肉厚よりも長いノズルスペースをと
ることができるようにしたのである。(d) Means for Solving the Problems In order to solve the above-mentioned problems, the present invention aims to make the flow path inherited from the injection pipe flow path to the rod crown flow diagonally downward to form the inflow section of the side injection nozzle. By setting back the rod, it was possible to take up a longer nozzle space than the normal wall thickness of the rod.
また、ノズルスペースが長くとれることにより、ノズル
径を太くすることが可能となり、側方ノズルをテーパー
構造にすることを可能としたのである。Additionally, the longer nozzle space allows the nozzle diameter to be increased, making it possible to form the side nozzles into a tapered structure.
更に側方ノズルのテーパー構造は硬化材噴流の噴射圧低
下を防止すると共に地盤1立方米あたりの注入硬化材量
を増加させ改良地盤の強度を増すことを可能にしたもの
である。Furthermore, the tapered structure of the side nozzle prevents a drop in the injection pressure of the hardening material jet, and also increases the amount of hardening material injected per cubic meter of ground, making it possible to increase the strength of the improved soil.
(ホ)実 施 例 以下、図面に従って本発明の詳細な説明する。(e) Implementation example Hereinafter, the present invention will be described in detail with reference to the drawings.
1は注入管で回転上下動機構2に支持され、上部はスイ
ベル3を介して硬化材供給部に連絡する供給ホース4に
連結し、先端には切削刃5を備え、側壁に側方噴射ノズ
ル6を設けたロッドクラウン7が装着されている。ロッ
ドクラウン7は上部が注入管1を螺着する流路承継部7
】となっており、そこから斜め下方に流下する斜降流路
72が設けられ、その下端部73が噴射方向に対してセ
ットバックされてその中心軸74がロッドクラウンの中
心軸75よりも後方に設定され、ノズルスペース76が
その分だけ長く確保されている。8はノズルチップでフ
ランジ81の後部は螺合部77に螺合する基部82、全
部は螺合部77に螺着する際のボソクス工具に係合する
保合部83を基部としてノズル外筒84を構成し、ノズ
ルライナー9を嵌着する嵌着孔85が穿設されている。Reference numeral 1 is an injection pipe that is supported by a rotating vertical movement mechanism 2, and the upper part is connected to a supply hose 4 that communicates with a hardening material supply section via a swivel 3, and a cutting blade 5 is provided at the tip, and a side injection nozzle is provided on the side wall. A rod crown 7 having a diameter of 6 is attached. The upper part of the rod crown 7 is a flow path joint part 7 into which the injection pipe 1 is screwed.
A diagonal descending flow path 72 is provided that flows diagonally downward from there, and its lower end 73 is set back with respect to the injection direction so that its central axis 74 is rearward of the central axis 75 of the rod crown. , and the nozzle space 76 is secured accordingly. Reference numeral 8 denotes a nozzle tip, and the rear part of the flange 81 is a base 82 that is screwed into the threaded part 77, and the entire nozzle outer cylinder 84 has a retaining part 83 that engages with a box tool when screwed into the threaded part 77 as the base. A fitting hole 85 into which the nozzle liner 9 is fitted is bored.
ノズルライナー9は後端にフランジ91を備えノズル入
口より出口の径を小さくしてテーパー状に絞ったノズル
孔92を穿設し、セラミックのような硬質の耐摩耗性物
質によって構成されている。このようなノズルライナー
9をノズルチップ8の嵌着孔85に嵌着しこれを斜降流
路72の下端に設けられた螺合部77に螺着されて側方
ノズル6が構成されるもので、この種の注入管に設けら
れる1、8〜2.5 ミリのノズル径よりもすっと大き
く、絞った噴射出口の径で3.2 ミリ程度に設けるこ
とが可能であり、適切である。The nozzle liner 9 has a flange 91 at its rear end, has a tapered nozzle hole 92 with a diameter smaller at the outlet than at the nozzle inlet, and is made of a hard wear-resistant material such as ceramic. The side nozzle 6 is configured by fitting such a nozzle liner 9 into the fitting hole 85 of the nozzle chip 8 and screwing it into the threaded part 77 provided at the lower end of the inclined downward flow path 72. This is much larger than the nozzle diameter of 1.8 to 2.5 mm provided in this type of injection pipe, and it is possible and appropriate to provide the diameter of the narrowed injection outlet to about 3.2 mm.
第6図は他の実施態様による側方ノズル6の構成を示す
もので、斜降流路の下端部7゜3から水平方向ではなく
下方に角度をつけてテーパーノズルを設定した場合でこ
のようにすることによりノズルスペースを更に長く確保
することができる。FIG. 6 shows the configuration of the side nozzle 6 according to another embodiment, in which the tapered nozzle is set not in the horizontal direction but at an angle downward from the lower end 7°3 of the diagonal descending channel. By doing so, the nozzle space can be secured even longer.
以上のように構成した注入管を対象地盤Aに先ず回転下
降させる。First, the injection pipe configured as described above is rotated and lowered to the target ground A.
泥炭地盤は含水比率300%〜1000%と地盤自体は
極めて軟弱であるが、木の根等の繊細質が多く、そのま
までは挿入が困難なため、注入管を回転させて先端の切
削刃5により、このような繊維物質を切削しながら注入
管を下降させる。このような繊維質のないところでは回
転させることなく自重でそのまま挿入しても良いのは勿
論である。The peat ground itself is extremely soft with a water content of 300% to 1000%, but there are many delicate substances such as tree roots, and it is difficult to insert it as is. Lower the injection tube while cutting the fibrous material. Of course, in such a place where there is no fibrous material, it may be inserted as it is without rotating it and using its own weight.
所定深度に達したところで、硬化材供給ポース4を通じ
て注入管1に地盤硬化材を高圧圧送し、側方ノズル6か
ら高圧噴射しながら注入管を回転上昇させることにより
、硬化材噴流で泥炭土壌と硬化材を攪拌混合して円柱状
の硬化層Bを造成して行くのであるが、これまでに開発
された注入管ではノズル径1.8〜2.5 ミリのスト
レートノズル程度にしか構成することができず、これに
よれば硬化材噴出量は毎分30リットル程度であるため
、硬化材は硬化する以前に水分の多い土壌に流出して硬
化密度を保つことができなかった。When a predetermined depth has been reached, the ground hardening material is fed under high pressure into the injection pipe 1 through the hardening material supply port 4, and the injection pipe is rotated upward while being injected at high pressure from the side nozzle 6, so that the hardening material jet forms peat soil. The hardening material is stirred and mixed to create a cylindrical hardened layer B, but the injection tubes developed so far can only be configured as straight nozzles with a nozzle diameter of 1.8 to 2.5 mm. According to this, since the amount of hardening material ejected was about 30 liters per minute, the hardening material flowed into the moist soil before hardening, making it impossible to maintain the hardening density.
本発明による方法は実験の結果、次の成果を得ている。As a result of experiments, the method according to the present invention has obtained the following results.
側方ノズル6のノズル径3.2 ミリ、噴射圧力200
kgf/cJ、注入管の回転数毎分20回、上昇速度
毎分3メー1−ル、上昇ピッチは2.5センチで上昇1
ステツプあたりの注入管の回転数は1.5回として設定
し、硬化材として日鉄アースタトト201(商品名)(
添加量300kg/醒、W/C1,,0)を400kg
に対して水600kgの割合によるスラリーとして実施
した。気温は19°C1天候は曇であった。Nozzle diameter of side nozzle 6: 3.2 mm, injection pressure: 200
kgf/cJ, injection tube rotation speed 20 times per minute, rising speed 3 meters per minute, rising pitch 2.5 cm, rising 1
The number of rotations of the injection tube per step was set at 1.5 times, and Nippon Steel Earth-Tato 201 (trade name) was used as the hardening material.
Addition amount 300kg/W/C1,,0) 400kg
The slurry was prepared using a ratio of 600 kg of water to 600 kg of water. The temperature was 19°C1 and the weather was cloudy.
その結果、硬化材突出量は毎分80リソ1〜ル造成され
た円柱状硬化層の径は800ミリ、硬化層の一軸圧縮強
度ば4. kg / cfで改良効果としては十分なも
のであった。As a result, the diameter of the cylindrical hardened layer created was 800 mm, and the unconfined compressive strength of the hardened layer was 4.5 mm. The improvement effect was sufficient at kg/cf.
なお、造成条件は対象地盤の含水比率等によって当然異
なってくるが、側方噴射ノズルのノズル径としては2.
5〜3.5 ミリ硬化材吐出量としては60〜90p/
分、噴射圧100〜300 kg / cM 、硬化材
添加量200〜500kg/ rr?程度が適切である
ことが現場実験と室内実験を合わせて確認された。Naturally, the construction conditions will vary depending on the water content ratio of the target ground, etc., but the nozzle diameter of the side injection nozzle is 2.
5 to 3.5 mm Hardening material discharge amount is 60 to 90 p/
min, injection pressure 100-300 kg/cM, hardening agent addition amount 200-500 kg/rr? It was confirmed through both field and laboratory experiments that the level was appropriate.
(へ)発明の作用及び効果
本発明は以上のように構成したので、側方噴射ノズルの
孔径を大きく構成できるようになり、テーパーノズルの
採用と相俟って硬化材噴流の攪拌硬化と硬化材の吐出量
を飛躍的に増大せしめたものである。(f) Functions and Effects of the Invention Since the present invention is configured as described above, the hole diameter of the side injection nozzle can be configured to be large, and in combination with the adoption of the tapered nozzle, stirring and hardening of the hardening material jet can be achieved. This dramatically increases the amount of material discharged.
これにより従来硬化層の強度が低いため、補充的にしか
利用することができなかった高圧噴射注入の泥炭地盤へ
の適用を本格化することに成功したものである。As a result, we have succeeded in full-scale application of high-pressure injection injection to peat ground, which previously could only be used supplementally due to the low strength of the hardened layer.
なお、本発明は条件によっては一般地盤への適用も十分
に可能なものである。Note that the present invention is fully applicable to general ground depending on the conditions.
図は本発明の実施例を示すもので、第1図は施工状況を
示す全体説明図、第2図はロッドクラウンの側面図、第
3図は同正面図、第4図はノズルチップの側断面間第5
図は同正面図、第6図は他の実施例によるロッドクラウ
ンの側面図、である。
1〜注入管 2〜回転上下動機構
3〜スイヘル 4〜供給ホース 5〜切削刃6〜側方噴
射ノズル 7〜ロッドクラウン71〜流路承継部 72
〜斜降流路
73〜斜降流路下端部 74〜斜降流路中心軸75〜ク
ラウンロッドの中心軸
76〜ノズルスペース 77〜螺合部
8〜ノズルチップ 81〜フランジ
82〜基部 83〜係台部 84〜ライナ一嵌着孔9〜
ノズルライナー 91〜ライナーのフランジ92〜ノズ
ル孔
A〜対象地盤 B〜円柱状硬化層The figures show an embodiment of the present invention, in which Fig. 1 is an overall explanatory diagram showing the construction situation, Fig. 2 is a side view of the rod crown, Fig. 3 is a front view thereof, and Fig. 4 is a side view of the nozzle tip. 5th between cross sections
The figure is a front view of the same, and FIG. 6 is a side view of a rod crown according to another embodiment. 1 - Injection pipe 2 - Rotating vertical movement mechanism 3 - Swivel 4 - Supply hose 5 - Cutting blade 6 - Side injection nozzle 7 - Rod crown 71 - Channel succession part 72
- Diagonal descending channel 73 - Lower end of the diagonal descending channel 74 - Diagonal descending channel central axis 75 - Crown rod central axis 76 - Nozzle space 77 - Threaded portion 8 - Nozzle tip 81 - Flange 82 - Base 83 - Connection Base part 84 ~ liner fitting hole 9 ~
Nozzle liner 91 ~ liner flange 92 ~ nozzle hole A ~ target ground B ~ cylindrical hardened layer
Claims (3)
ら、斜め下方に流下してセットバックされた流路下端か
ら横方向に全体としてロッド半径よりも長いテーパーノ
ズルを設けたロッドクラウンを先端に装着した注入管を
対象とする地盤中に下降させて所定深度まで挿入し、注
入管に地盤硬化材を高圧力で圧送して前記テーパーノズ
ルから高圧噴流として噴射させながら注入管を回転上昇
させて地盤中に円柱状硬化層を造成することを特徴とす
る泥炭地盤の改良方法(1) A tapered nozzle whose tip part is closed and the flow path is set back from the lower end of the flow path that flows diagonally downward from the flow path joint part of the injection tube at the rear end and is laterally longer than the rod radius as a whole is provided. An injection pipe with a rod crown attached to the tip is lowered into the target ground and inserted to a predetermined depth, and the soil hardening material is pumped into the injection pipe at high pressure and injected as a high-pressure jet from the tapered nozzle. A method for improving peat ground characterized by creating a cylindrical hardened layer in the ground by rotating and lifting a pipe.
め下方に流下してセットバックされた流路下端から水平
方向に全体としてロッド半径よりも長いテーパーノズル
を設けたロッドクラウンを先端に装着した注入管を回転
上下動機構によって支持し、注入管の上端はスイベルを
介して硬化材供給部に連絡させたことを特徴とする泥炭
地盤等改良装置(2) A rod crown with a cutting blade at the tip and a tapered nozzle that is longer than the rod radius in the horizontal direction from the lower end of the flow path that flows diagonally downward from the flow path joint of the injection tube and is set back. A peat ground improvement device characterized in that an injection pipe attached to the tip is supported by a rotating vertical movement mechanism, and the upper end of the injection pipe is connected to a hardening material supply section via a swivel.
るテーパーノズルを斜め下方若しくは上方に角度を設け
て設定するようにした特許請求の範囲(2)記載の泥炭
地盤等改良装置(3) Peat ground improvement device according to claim (2), wherein the taper nozzle is provided laterally from the lower end of the flow path of the rod crown and is set at an angle diagonally downward or upward.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62311004A JPH0674582B2 (en) | 1987-12-10 | 1987-12-10 | Peat soil improvement method and its equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62311004A JPH0674582B2 (en) | 1987-12-10 | 1987-12-10 | Peat soil improvement method and its equipment |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH01154912A true JPH01154912A (en) | 1989-06-16 |
JPH0674582B2 JPH0674582B2 (en) | 1994-09-21 |
Family
ID=18011965
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62311004A Expired - Fee Related JPH0674582B2 (en) | 1987-12-10 | 1987-12-10 | Peat soil improvement method and its equipment |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0674582B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06146260A (en) * | 1992-11-10 | 1994-05-27 | Ask Kenkyusho:Kk | Forming method of columnar body in ground and device therefor |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5346109A (en) * | 1976-10-08 | 1978-04-25 | Wataru Nakanishi | Method of forming underground pile |
JPS5490811A (en) * | 1977-12-27 | 1979-07-18 | Kajima Corp | Grout injector |
JPS5520802A (en) * | 1978-07-31 | 1980-02-14 | Nitto Techno Group:Kk | Construction of chemical grouting pipe |
-
1987
- 1987-12-10 JP JP62311004A patent/JPH0674582B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5346109A (en) * | 1976-10-08 | 1978-04-25 | Wataru Nakanishi | Method of forming underground pile |
JPS5490811A (en) * | 1977-12-27 | 1979-07-18 | Kajima Corp | Grout injector |
JPS5520802A (en) * | 1978-07-31 | 1980-02-14 | Nitto Techno Group:Kk | Construction of chemical grouting pipe |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06146260A (en) * | 1992-11-10 | 1994-05-27 | Ask Kenkyusho:Kk | Forming method of columnar body in ground and device therefor |
Also Published As
Publication number | Publication date |
---|---|
JPH0674582B2 (en) | 1994-09-21 |
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