JPS5812437B2 - Method for monitoring dry sand amount in muddy shield drilling method - Google Patents
Method for monitoring dry sand amount in muddy shield drilling methodInfo
- Publication number
- JPS5812437B2 JPS5812437B2 JP7192277A JP7192277A JPS5812437B2 JP S5812437 B2 JPS5812437 B2 JP S5812437B2 JP 7192277 A JP7192277 A JP 7192277A JP 7192277 A JP7192277 A JP 7192277A JP S5812437 B2 JPS5812437 B2 JP S5812437B2
- Authority
- JP
- Japan
- Prior art keywords
- excavation
- dry sand
- amount
- sand amount
- standard
- 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
Links
- 239000004576 sand Substances 0.000 title claims description 34
- 238000012544 monitoring process Methods 0.000 title claims description 13
- 238000000034 method Methods 0.000 title claims description 12
- 238000005553 drilling Methods 0.000 title 1
- 238000009412 basement excavation Methods 0.000 claims description 46
- 238000005259 measurement Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000005251 gamma ray Effects 0.000 description 4
- 230000005484 gravity Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
Landscapes
- Excavating Of Shafts Or Tunnels (AREA)
Description
【発明の詳細な説明】
この発明は泥水式シールド掘削工法における乾砂量の監
視方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for monitoring the amount of dry sand in a muddy shield excavation method.
従来、泥水式シールド掘削工法において、掘削機の送水
管と排泥管とにそれぞれガンマ線密度計と流量計とを設
けて演算器により実掘削乾砂量を算出し、この乾砂量を
監視しながら掘削管理を行っていたが、乾砂量が増大し
た場合そのまま掘削を続行しても安全なのか、あるいは
掘削を中断して原因を究明すべきかどうかの判断が困難
であった。Conventionally, in the mud shield excavation method, a gamma ray density meter and a flow meter were installed in the water pipe and mud drainage pipe of the excavator, the actual excavated dry sand amount was calculated by a calculator, and this dry sand amount was monitored. However, when the amount of dry sand increased, it was difficult to judge whether it was safe to continue excavation or whether to suspend excavation and investigate the cause.
この発明は上記のような従来の欠点を排除できる乾砂量
の監視方法を提供することを目的とする。It is an object of the present invention to provide a method for monitoring the amount of dry sand that can eliminate the drawbacks of the conventional methods as described above.
この発明による方法は各基準掘削距離毎に掘削する泥水
式シールド掘削工法において、
（ａ）実瞬間掘削乾砂量を測定する測定工程と（ｂ）前
記実瞬間掘削乾砂量の測定値を区分演算器に導き各基準
掘削距離を複数に分割してなる各分割区分ごとの平均瞬
間掘削乾砂量を算出する第１の算出工程と
（ｃ）前記第１の算出工程の算出値に各分割区分の掘削
時間を乗算して各分割区分の実掘削乾砂量を算出する第
２の算出工程と
（ｄ）前記第２の算出工程の算出値から各基準掘削距離
ごとの標準偏差を算出する第３の算出工程と
（ｅ）前記標準偏差の算出値に応じて後続の基準掘削距
離に対する管理限界を設定器に設定する設定工程と
（ｆ）前記第２の算出工程の算出値が管理限界内にある
．か否かを監視する監視工程と
を備えてなることを特徴とするものである。The method according to the present invention uses (a) a measurement step of measuring the actual instantaneous excavated dry sand amount, and (b) a measurement step of the actual instantaneous excavated dry sand amount in the muddy shield excavation method in which excavation is performed for each standard excavation distance. (c) a first calculation step of dividing each reference excavation distance into a plurality of parts to calculate the average instantaneous excavated dry sand amount for each division; and (c) dividing each into the calculated value of the first calculation step. A second calculation step of calculating the actual excavated dry sand amount of each division by multiplying the excavation time of the division; and (d) calculating the standard deviation for each standard excavation distance from the calculated value of the second calculation step. a third calculation step; (e) a setting step of setting a control limit for the subsequent standard excavation distance in a setting device according to the calculated value of the standard deviation; and (f) a setting step in which the calculated value of the second calculation step is the control limit. It is within. The present invention is characterized by comprising a monitoring step of monitoring whether or not.
この発明を図示の実施例を参照して以下に説明する。The invention will be explained below with reference to illustrated embodiments.
第１図において、１，２はそれぞれ泥水式シールド掘削
機（図示せず）の送水管および排泥管であって、送水管
１および排泥管２のそれぞれにガンマ線密度計３，４と
流量計５，６とを設け、各ガンマ線密度計３，４は変換
増幅器７を介してそれぞれ真比重設定器８，９に接続さ
せ、各流量計５，６は変換増幅器１０を介して乗除演算
器１１１２に接続させる。In FIG. 1, reference numerals 1 and 2 are a water pipe and a mud drainage pipe of a mud shield excavator (not shown), and gamma ray densitometers 3 and 4 and a flow rate are attached to the water pipe 1 and mud drainage pipe 2, respectively. Each gamma ray density meter 3, 4 is connected to a true specific gravity setting device 8, 9 through a conversion amplifier 7, and each flowmeter 5, 6 is connected to a multiplication/division calculator through a conversion amplifier 10. Connect to 1112.
各演算器１１．１２は真比重設定器８，９からの信号を
流量計５，６からの信号に乗尊してそれぞれ送水管１お
よび排泥管２内の乾砂量を算出する。Each computing unit 11, 12 multiplies the signals from the true specific gravity setters 8, 9 by the signals from the flowmeters 5, 6 to calculate the amount of dry sand in the water pipe 1 and the mud removal pipe 2, respectively.
演算器１１．１２からの各信号を加減演算器１３に導き
、引算して実瞬間掘削乾砂量を算出し、その信号を積算
演算器１４に導いて基準掘削距離、例えばセグメントの
一リングの長さ即ち９０ｃｍの実掘削乾砂量を積算し、
監視盤１５に表示する（特開昭５０−８０６３８参照）
。Each signal from the calculators 11 and 12 is guided to the adder/subtractor 13, and subtracted to calculate the actual instantaneous excavated dry sand amount.The signals are led to the integration calculator 14 to calculate the standard excavation distance, for example, one ring of a segment. Accumulate the actual excavated dry sand amount for the length of 90cm,
Display on the monitoring panel 15 (see Japanese Patent Application Laid-Open No. 50-80638)
.
Ｓはスイッチである。更にこの発明では、加減演算器１
３からの実瞬間掘削乾砂量の信号を区分演算器１６に導
き、分割区分に対する平均瞬間掘削乾砂量を算出し、平
均瞬間掘削乾砂量に分割区分掘削時間を乗算して分割区
分実掘削乾砂量を算出し、その信号を母集団器１７に送
る。S is a switch. Furthermore, in this invention, the addition/subtraction operator 1
The signal of the actual instantaneous excavated dry sand amount from 3 is led to the division calculator 16, and the average instantaneous excavated dry sand amount for the divided divisions is calculated, and the average instantaneous excavated dry sand amount is multiplied by the divided division excavation time to calculate the divided division actual. The amount of excavated dry sand is calculated and the signal is sent to the population device 17.
ここで分割区分とは前述した基準掘削距離を数分の一又
は数十分のーに分割した掘進の長さとする。Here, the term "division" refers to the length of excavation obtained by dividing the standard excavation distance mentioned above into fractions or tens of minutes.
分割区分掘削時間は分割区分を掘進するのに要した時間
を指す。Divided section excavation time refers to the time required to excavate a divided section.
区分演算器１６で算出した分割区分実掘削乾砂量の信号
は母集団器１７に送られ、母集団器１７は分割区分実掘
削乾砂量を標本とする母集団の標準偏差を算出する。The signal of the actual excavated dry sand amount of each divided section calculated by the divided section calculation unit 16 is sent to the population unit 17, and the population device 17 calculates the standard deviation of the population whose sample is the actual excavated dry sand amount of each divided section.
標準偏差は統計学の基本式から算出する。標準偏差の算
出値は次の基準掘削距離に対する管理限界として次の基
準掘削距離の掘削開始前に設定器１８に設定し、管理限
界Ｂ，Ｂが監視盤１５に表示される。The standard deviation is calculated using a basic statistical formula. The calculated value of the standard deviation is set in the setting device 18 as a control limit for the next reference excavation distance before the start of excavation for the next reference excavation distance, and the control limits B, B are displayed on the monitoring panel 15.
すなわち、管理限界Ｂ，Ｂは第２図に示すように、実掘
削乾砂量Ａが基準掘削距離に対する積算値で表示される
ので、標準偏差の算出過程で算出される母集団の平均値
を積算した値に標準偏差の正負値を順次加算した平行な
直線ＢＢで表示される。In other words, as shown in Figure 2, the control limits B and B are expressed as the cumulative value of the actual excavated dry sand amount A with respect to the standard excavation distance. It is displayed as a parallel straight line BB obtained by sequentially adding the positive and negative values of the standard deviation to the integrated value.
以上のように基準掘削距離を掘削している際に、後続の
基準掘削距離の管理限界を設定するとともに、現在掘削
中の実掘削乾砂量Ａがその直前に設定された管理限界Ｂ
，Ｂ内に入っているか否かを監視するものである。As described above, when excavating the standard excavation distance, the control limit for the subsequent standard excavation distance is set, and the actual excavated dry sand amount A currently being excavated is the control limit B set immediately before.
,B.
第２図において実掘削乾砂量Ａが増大している部分が数
個所あるが、管理限界Ｂ，Ｂ内に入っている限りにおい
ては地質が直前の基準掘削距離に関するものとほぼ同様
であって、掘削が正常に行なわれていると判断し、掘削
を続行する。In Figure 2, there are several areas where the actual excavated dry sand amount A has increased, but as long as it is within the control limits B and B, the geology is almost the same as that related to the previous standard excavation distance. , determines that the excavation is being performed normally, and continues excavation.
また実掘削乾砂量ＡがＣ部分のように管理限界Ｂ，Ｈの
外にはみ出した場合、掘削に異常が生じたと判断し、掘
削を中断して次の事項をチェックする。Furthermore, if the actual excavated dry sand amount A protrudes outside the control limits B and H, as in part C, it is determined that an abnormality has occurred in the excavation, and the excavation is interrupted and the following items are checked.
（イ）各機器類の誤動作の有無
上記（イ）の事項が原因である場合は各機器類を調整し
て掘削を再び開始し、そうでない場合はさらに次の事項
をチェックする。(b) Is there a malfunction in each equipment? If the cause is the item (a) above, adjust each equipment and start excavation again. If not, check the following items.
（ロ）余掘、路面沈下等の有無
（ハ）地質（密度）の変化の有無
（ニ）逸水量
これらのチェック事項の結果にもとずき、次の５項目に
対する調整をなしつつ掘削を再開する。(b) Excess excavation, road surface subsidence, etc. (c) Changes in geology (density) (d) Loss of water Based on the results of these checks, excavation should be carried out while adjusting the following five items. resume.
（ａ）切羽水圧の調整
（ｂ）安定液濃度の調整
（ｃ）ジャッキ速度の調整
（ｄ）送排泥流量の調整
（ｅ）真比重の設定の調整
これらの調整により実掘削乾砂量Ａが管理限界Ｂ，Ｂ内
に戻った時に掘削を開始する。(a) Adjustment of face water pressure (b) Adjustment of stable liquid concentration (c) Adjustment of jacking speed (d) Adjustment of mud flow rate (e) Adjustment of true specific gravity setting These adjustments will reduce the actual excavated dry sand amount A Excavation will begin when the amount returns to within the control limits B and B.
これらの調整を行っても管理限界Ｂ，Ｂ内に戻らない時
は地質に大きな変化が生じたものと判断して管理限界の
補正を行ない、基準掘削距離を掘削する。If it does not return to within control limits B and B even after making these adjustments, it is determined that a major change has occurred in the geology, the control limits are corrected, and the standard excavation distance is excavated.
尚、最初の基準掘削距離に対する管理限界はポーリング
した地質や経験から予想して設定する。The control limit for the initial standard excavation distance is set based on predictions based on the polled geology and experience.
この発明によれば、既に掘削を終えた直前の基準掘削距
離における分割区分実掘削乾砂量を標本とする母集団の
標準偏差を算出し、この標準偏差に応じて次の基準掘削
距離に対する実掘削乾砂量の管理限界を設定するから、
地質が複雑であって分割区分実掘削乾砂量のばらつきが
大きい場合すなわち標準偏差が大きい場合は、管理限界
の幅が大きくなり、また地質が比較的均一であって分割
区分実掘削乾砂量のばらつきが小さい場合すなわち標準
偏差が小さい場合は管理限界の幅が小さくなり、したが
って掘進に伴う地質変化に応じた管理限界を設定でき、
このような管理限界内に実掘削乾砂量が入っているか否
かを監視することにより、十分好適な掘削管理を達成で
きる。According to this invention, the standard deviation of a population sampled by the actual excavated dry sand amount of the divided divisions at the standard excavation distance immediately before the completion of excavation is calculated, and the actual excavation distance for the next standard excavation distance is calculated according to this standard deviation. By setting control limits for the amount of dry sand excavated,
If the geology is complex and the variation in the actual excavated dry sand volume for each division is large, that is, if the standard deviation is large, the width of the control limit will be large; When the dispersion of
By monitoring whether the actual excavated dry sand amount is within such control limits, sufficiently suitable excavation management can be achieved.
第１図はこの発明の方法の一実施例のためのブロック図
、第２図は監視盤の正面図である。
１……送水管、２……排泥管、３，４……ガンマ線密度
計、５，６……流量計、１４……積算演算器、１５……
監視盤、１６……区分演算器、１７……母集団器、１８
……設定器、Ａ……実掘削乾砂量、Ｂ，Ｂ……管理限界
。FIG. 1 is a block diagram for one embodiment of the method of the present invention, and FIG. 2 is a front view of a monitoring panel. 1... Water pipe, 2... Sludge drain pipe, 3, 4... Gamma ray density meter, 5, 6... Flow meter, 14... Integration calculator, 15...
Monitoring panel, 16...Division calculator, 17...Population device, 18
... Setting device, A ... Actual excavated dry sand amount, B, B ... Control limit.
Claims (1)
法において、 （ａ）実瞬間掘削乾砂量を測定する測定工程と（ｂ）前
記実瞬間掘削乾砂量の測定値を区分演算器に導き各基準
掘削距離を複数に分割してなる各分割区分ごとの平均瞬
間掘削乾砂量を算出する第１の算出工程と （ｃ）前記第１の算出工程の算出値に各分割区分の掘削
時間を乗算して各分割区分の実掘削乾砂量を算出する第
２の算出工程と （ｄ）前記第２の算出工程の算出値から各基準掘削距離
ごとの標準偏差を算出する第３の算出工程と （ｅ）前記標準偏差の算出値に応じて後続の基準掘削距
離に対する管理限界を設定器に設定する設定工程と （ｆ）前記第２の算出工程の算出値が管理限界内にある
か否かを監視する監視工程と を備えてなることを特徴とする泥水式シールド掘削工法
における乾砂量の監視方法。[Claims] 1. In the mud shield excavation method in which excavation is performed for each reference excavation distance, (a) a measurement step of measuring the actual instantaneous excavated dry sand amount; and (b) a measured value of the actual instantaneous excavated dry sand amount. a first calculation step of dividing each standard excavation distance into a plurality of sections to calculate the average instantaneous excavated dry sand amount for each division; and (c) calculating the calculated value of the first calculation step. A second calculation step of calculating the actual excavated dry sand amount of each division by multiplying the excavation time of each division, and (d) calculating the standard deviation for each standard excavation distance from the calculated value of the second calculation step. (e) a setting step of setting a control limit for the subsequent standard excavation distance in a setting device according to the calculated value of the standard deviation; and (f) a setting step in which the calculated value of the second calculation step is 1. A method for monitoring the amount of dry sand in a muddy shield excavation method, comprising: a monitoring step for monitoring whether or not the amount is within a control limit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7192277A JPS5812437B2 (en) | 1977-06-17 | 1977-06-17 | Method for monitoring dry sand amount in muddy shield drilling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7192277A JPS5812437B2 (en) | 1977-06-17 | 1977-06-17 | Method for monitoring dry sand amount in muddy shield drilling method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS547735A JPS547735A (en) | 1979-01-20 |
| JPS5812437B2 true JPS5812437B2 (en) | 1983-03-08 |
Family
ID=13474501
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7192277A Expired JPS5812437B2 (en) | 1977-06-17 | 1977-06-17 | Method for monitoring dry sand amount in muddy shield drilling method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5812437B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6287835U (en) * | 1985-11-21 | 1987-06-04 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4648037B2 (en) * | 2005-03-04 | 2011-03-09 | 鹿島建設株式会社 | Digging management method in shield method |
-
1977
- 1977-06-17 JP JP7192277A patent/JPS5812437B2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6287835U (en) * | 1985-11-21 | 1987-06-04 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS547735A (en) | 1979-01-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Bertoldi et al. | A method for estimating the mean bed load flux in braided rivers | |
| Bousmar et al. | Momentum transfer for practical flow computation in compound channels | |
| Maheepala et al. | Hydrological data monitoring for urban stormwater drainage systems | |
| US3946605A (en) | Apparatus and method of measuring fluctuations of excavated mud amount in a slurry line | |
| Bijankhan et al. | Application of the submerged experimental velocity profiles for the sluice gate's stage-discharge relationship | |
| CN115898845A (en) | An automatic control system for large-scale two-fluid grouting | |
| Shirley et al. | A sediment yield equation from an erosion simulation model | |
| JPS5812437B2 (en) | Method for monitoring dry sand amount in muddy shield drilling method | |
| Askew | Variation in lag time for natural catchments | |
| Savenije | Determination of estuary parameters on basis of Lagrangian analysis | |
| CN116295677A (en) | Method for automatically measuring flow of large section of high sediment river | |
| Gensen et al. | Improving rating curve accuracy by incorporating water balance closure at river bifurcations | |
| Srinivasan et al. | Evaluation of runoff and erosion loss in micro-basins utilizing the hydrodynamic model WESP | |
| JPS5822633B2 (en) | Excavation management method and excavation management device for muddy water shield excavator | |
| JPS5880094A (en) | Face stable control of shield drilling machine | |
| Clemmens | Evaluating infiltration for border irrigation models | |
| JPS6145040B2 (en) | ||
| US20030236639A1 (en) | Sewer flow analysis method | |
| JPH08286729A (en) | Drainage pump operation support system | |
| Parsons et al. | A miniature flume for sampling interrill overland flow | |
| JPH06257137A (en) | Water level control method of stable liquid for underground continuous wall construction using atmospheric pressure sensor | |
| JPH02278141A (en) | Apparatus for measuring amount of excavated soil and excavation method | |
| SU451007A1 (en) | The method of controlling the process of preparation of the waste | |
| JPS5831062Y2 (en) | Pipe blockage detection device | |
| JPS6057215A (en) | Slurry quantity measuring device |