JP3081904B2 - Method and apparatus for predicting combustible gas generation - Google Patents
Method and apparatus for predicting combustible gas generationInfo
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- JP3081904B2 JP3081904B2 JP07069243A JP6924395A JP3081904B2 JP 3081904 B2 JP3081904 B2 JP 3081904B2 JP 07069243 A JP07069243 A JP 07069243A JP 6924395 A JP6924395 A JP 6924395A JP 3081904 B2 JP3081904 B2 JP 3081904B2
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- gas
- groundwater
- sediment
- amount
- concentration
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Description
【０００１】[0001]
【産業上の利用分野】本発明は、シールドトンネル工事
で掘削中に発生する可燃性ガスの発生の予知方法及びそ
の装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for predicting the generation of combustible gas generated during excavation in shield tunnel construction.
【０００２】[0002]
【従来の技術】トンネル工事では、シールド掘削機械に
よるシールド工法が多く採用されており、可燃性ガスを
包蔵している地層の掘削時には、掘削機械とトンネルと
の隙間から可燃性ガスがトンネル内に流れ、ガス爆発を
起こすことが多い。2. Description of the Related Art In tunnel construction, a shield construction method using a shield excavation machine is often used. When excavating a stratum containing flammable gas, flammable gas enters the tunnel from a gap between the excavation machine and the tunnel. Flow and gas explosions often occur.
【０００３】ガス爆発防止のためにはガス検知が必要で
あるが、従来の検知方法は、例えばトンネル内の切り羽
付近などの複数個所にガス検知器を設置するもので、こ
の検知器で検知されたガスの濃度が危険域に達している
と、警報を発する。[0003] Gas detection is necessary to prevent gas explosion, but the conventional detection method is to install gas detectors at a plurality of locations, for example, near a cutting face in a tunnel. If the concentration of the gas reaches a dangerous area, an alarm is issued.
【０００４】[0004]
【発明が解決しようとする課題】ガス検知器を設置して
検知する方法では、ガス検知がスポット的に行われるた
め、設置場所から離れた所で可燃性ガスが発生した場合
は、これを検知できない。また、ガスがトンネル内に流
入してからはじめてこれを検知するものであるから、ガ
ス発生が急激な場合は、検知・警報装置が作動しても、
作業者の避難や電源遮断等の対策が間に合わないことが
ある。In the method of installing and detecting a gas detector, the gas is detected in a spot-like manner. Therefore, if a flammable gas is generated at a location away from the installation location, this is detected. Can not. In addition, since the gas is detected only after flowing into the tunnel, if the gas generation is rapid, even if the detection / warning device operates,
In some cases, measures such as evacuating workers or shutting off the power are not in time.
【０００５】本発明の目的は前記従来例の不都合を解消
し、ガスが実際にトンネル内に流入する前に地層中に含
まれるガスを直接検知して、広範囲におけるガス発生ひ
いてはガス爆発の危険性を予知でき、安全性を高めるこ
とのできる可燃性ガス発生の予知方法及び装置を提供す
ることにある。SUMMARY OF THE INVENTION An object of the present invention is to eliminate the disadvantages of the prior art and directly detect the gas contained in the stratum before the gas actually flows into the tunnel, thereby generating gas over a wide area and consequently the danger of gas explosion. It is an object of the present invention to provide a method and apparatus for predicting the generation of combustible gas, which can predict the occurrence of flammable gas and can improve safety.
【０００６】[0006]
【課題を解決するための手段】本発明は、前記目的を達
成するため、第１に、掘削機械前方の掘削しようとする
地層中から掘削に先立って地下水のみを直接採取し、こ
の地下水の採取量、温度、静水圧を計測するとともに地
下水に含有されている可燃性ガスを遊離し、このガスの
発生量と濃度とを計測し、これらのデータにより可燃性
ガスの溶解量と飽和溶解量、その飽和度を算出すること
を要旨とするものである。In order to achieve the above object, the present invention firstly collects only groundwater prior to excavation from a stratum to be excavated in front of a drilling machine, and collects this groundwater. Measure the amount, temperature, hydrostatic pressure and release the flammable gas contained in the groundwater, measure the generation amount and concentration of this gas, and based on these data, the amount of flammable gas dissolved and saturated dissolved, The gist is to calculate the degree of saturation.
【０００７】第２に、掘削機械が掘削した土砂を採取
し、この土砂の重量と土砂含水率、土砂中の地下水の温
度、静水圧を計測するとともに掘削土砂に含有されてい
る可燃性ガスを遊離し、このガスの発生量と濃度とを計
測し、これらのデータにより可燃性ガスの溶解量と飽和
溶解量、その飽和度を算出することを要旨とするもので
ある。Second, sediment excavated by the excavating machine is sampled, the weight of the sediment, the water content of the sediment, the temperature of the groundwater in the sediment, the hydrostatic pressure are measured, and the combustible gas contained in the excavated sediment is measured. The gist of the present invention is to measure the amount and concentration of the released gas and calculate the dissolved amount, the saturated dissolved amount, and the saturation degree of the combustible gas from these data.
【０００８】第３に、掘削機械の前部に設けた地下水採
取管と、該地下水採取管が開口するガス遊離室と、前記
地下水採取管で採取した地下水の採取量、温度及び静水
圧をそれぞれ計測する液体流量計と、地下水温度検知器
と、地下水圧検知器と、ガス遊離室で地下水から遊離し
たガスの発生量と濃度とをそれぞれ計測するガス流量計
と、可燃性ガス検知器と、地下水の採取量、温度、静水
圧、ガスの発生量と濃度などのデータにより可燃性ガス
の溶解量と飽和溶解量、その飽和度を算出するデータ処
理装置とにより構成することを要旨とするものである。Third, a groundwater sampling pipe provided at the front of the excavating machine, a gas release chamber in which the groundwater sampling pipe opens, and a collection amount, temperature and hydrostatic pressure of the groundwater collected by the groundwater sampling pipe are respectively described. A liquid flow meter for measuring, a groundwater temperature detector, a groundwater pressure detector, a gas flowmeter for measuring the amount and concentration of gas released from groundwater in the gas release chamber, respectively, a combustible gas detector, It consists of a data processing device that calculates the amount of flammable gas dissolved and saturated dissolved, and the degree of saturation based on data such as the amount of groundwater collected, temperature, hydrostatic pressure, gas generation and concentration. It is.
【０００９】第４に、掘削機械の内部前方に設けた掘削
土砂採取用のスクリューコンベアと、該スクリューコン
ベアの排出端に配設する土砂攪拌ガス遊離室と、前記ス
クリューコンベアで採取した掘削土砂の流量と土砂含水
率、土砂中の地下水の温度、静水圧をそれぞれ計測する
土砂流量計と、土砂含水率計と、地下水温度検知器と、
地下水圧検知器と、土砂攪拌ガス遊離室で土砂から遊離
したガスの発生量と濃度とをそれぞれ計測するガス流量
計と、可燃性ガス検知器と、土砂の流量と土砂含水率、
土砂中の地下水の温度、静水圧、ガスの発生量と濃度な
どのデータにより可燃性ガスの溶解量と飽和溶解量、そ
の飽和度を算出するデータ処理装置とにより構成するこ
とを要旨とするものである。Fourthly, a screw conveyor for collecting the excavated earth and sand provided at the front of the inside of the excavating machine, a sediment agitated gas release chamber disposed at the discharge end of the screw conveyor, and an excavated earth and sand collected by the screw conveyor. A sediment flow meter that measures flow rate and soil moisture content, the temperature of groundwater in the soil, and the hydrostatic pressure, a soil moisture content meter, and a groundwater temperature detector,
A groundwater pressure detector, a gas flow meter that measures the amount and concentration of gas released from the sediment in the sediment agitation gas release chamber, a combustible gas detector, a flow rate of the sediment, and a moisture content of the sediment,
The gist consists of a data processing device that calculates the amount of flammable gas dissolved and saturated, and the degree of saturation, based on data such as the temperature, hydrostatic pressure, and the amount and concentration of gas generated in soil and groundwater. It is.
【００１０】[0010]
【作用】請求項１記載の本発明によれば、可燃性ガスは
地層中で地下水に溶解して存在し、また、遊離してガス
層を形成している場合があるが、逆にガス層を形成して
いる場合はその周辺の地下水にも溶解している。よっ
て、掘削しようとしている地層中から地下水のみを直接
採取し、この地下水に含まれている可燃性ガスの飽和
度、濃度を算出することで、爆発発生の危険性の程度を
算定する。According to the first aspect of the present invention, the flammable gas may be dissolved in the groundwater in the stratum and may be separated to form a gas layer. When it is formed, it is also dissolved in the surrounding groundwater. Therefore, only the groundwater is directly collected from the stratum to be excavated, and the degree of danger of explosion is calculated by calculating the saturation and concentration of the flammable gas contained in the groundwater.
【００１１】請求項２記載の本発明によれば、地下水に
溶解している可燃性ガスの飽和度・濃度を算出する手段
として、掘削した土砂を採取して、この土砂の中からこ
こに含まれる地下水に溶解している可燃性ガスを抽出し
て、その飽和度、濃度を算出することで、爆発発生の危
険性の程度を算定する。According to the second aspect of the present invention, as means for calculating the saturation / concentration of combustible gas dissolved in groundwater, excavated earth and sand is collected and included in the earth and sand. The degree of danger of explosion is calculated by extracting flammable gas dissolved in groundwater and calculating its saturation and concentration.
【００１２】請求項３記載の本発明によれば、掘削機械
の前部に設けた地下水採取管によって、これから掘削し
ようとする地層の地下水が採取され、採取した地下水
は、ガス遊離室で水中に含有されている可燃性ガスが分
離される。一方、前記地下水採取管で採取した地下水の
採取量、温度及び静水圧はそれぞれ液体流量計と、地下
水温度検知器と、地下水圧検知器とによって計測され
る。ガス遊離室で地下水から遊離したガスの発生量と濃
度はそれぞれガス流量計と、可燃性ガス検知器とにより
計測される。そして、地下水の採取量、温度、静水圧、
ガスの発生量と濃度などのデータにより可燃性ガスの溶
解量と飽和溶解量、その飽和度をデータ処理装置で算出
し、その算出結果によって爆発発生の危険性を判断す
る。According to the third aspect of the present invention, the groundwater of the stratum to be excavated is collected by the groundwater sampling pipe provided at the front of the drilling machine, and the collected groundwater is submerged in the gas release chamber. The contained flammable gas is separated. On the other hand, the amount, temperature, and hydrostatic pressure of the groundwater collected by the groundwater collection pipe are measured by a liquid flow meter, a groundwater temperature detector, and a groundwater pressure detector, respectively. The amount and concentration of gas released from groundwater in the gas release chamber are measured by a gas flow meter and a combustible gas detector, respectively. And the amount of groundwater collected, temperature, hydrostatic pressure,
The dissolved amount, saturated dissolved amount, and saturation of the combustible gas are calculated by a data processor based on data such as the amount and concentration of gas generated, and the danger of explosion is determined based on the calculation result.
【００１３】請求項４記載の本発明によれば、掘削機械
の内部前方に設けたスクリューコンベアで掘削土砂を採
取し、該スクリューコンベアの排出端に配設する土砂攪
拌ガス遊離室で採取した掘削土砂の中から可燃性ガスを
分離し、前記スクリューコンベアで採取した掘削土砂の
流量と土砂含水率、土砂中の地下水の温度、静水圧をそ
れぞれ土砂流量計と、土砂含水率計と、地下水温度検知
器と、地下水圧検知器とで計測する。また、土砂攪拌ガ
ス遊離室で土砂から遊離したガスの発生量と濃度とをそ
れぞれガス流量計と、可燃性ガス検知器とで計測する。
そして、土砂の流量と土砂含水率、土砂中の地下水の温
度、静水圧、ガスの発生量と濃度などのデータによりデ
ータ処理装置で可燃性ガスの溶解量と飽和溶解量、その
飽和度を算出し、その算出結果によって爆発発生の危険
性を判断する。According to the fourth aspect of the present invention, excavated soil is collected by a screw conveyor provided in the front of the excavating machine, and excavated by a sediment agitated gas release chamber disposed at a discharge end of the screw conveyor. Separating the combustible gas from the sediment, the excavated sediment flow and sediment moisture content, the temperature of the groundwater in the sediment, and the hydrostatic pressure of the excavated sediment collected by the screw conveyor were measured with a sediment flow meter, sediment moisture content meter, and groundwater temperature, respectively. Measure with a detector and a groundwater pressure detector. In addition, the amount and concentration of gas released from the earth and sand in the earth and sand stirring gas release chamber are measured by a gas flow meter and a combustible gas detector, respectively.
The data processing device calculates the amount of flammable gas dissolved and the amount of saturated dissolution, and the degree of saturation, based on data such as the flow rate of sediment and the soil moisture content, the temperature of groundwater in the soil, the hydrostatic pressure, the amount and concentration of gas generated Then, the risk of explosion is determined based on the calculation result.
【００１４】[0014]
【実施例】以下、図面について本発明の実施例を詳細に
説明する。図１は本発明の可燃性ガス発生の予知装置の
第１実施例を示す説明図で、本発明装置は、一例として
図２に示すような掘削機械であるシールド掘削機に実施
される。このシールド掘削機は軟弱な滞水性地盤などに
おいて泥水加圧シールド工法により掘削する泥水加圧シ
ールド機で、周知のように前方のカッタードラム１の背
後のチャンバ２内に送泥管３と排泥管４を開口し、バル
クヘッド６にアジテータ５を設けたものである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory view showing a first embodiment of a device for predicting the generation of combustible gas according to the present invention. The device of the present invention is applied to, for example, a shield excavator which is an excavating machine as shown in FIG. This shield excavator is a muddy pressurized shield machine that excavates on soft stagnant ground or the like by a muddy pressurized shield method. As is well known, a mud pipe 3 and a mud pipe 3 are inserted into a chamber 2 behind a front cutter drum 1. A tube 4 is opened, and an agitator 5 is provided on a bulkhead 6.
【００１５】かかるシールド掘削機のバルクヘッド６、
カッタードラム１を貫通させて、カッタードラム１の前
方に、先端にストレーナ部７を地下水採取管８を突設す
る。該地下水採取管８を、途中に送水ポンプ９を有する
送水管10の一端に開口し、該送水管10の他端をガス遊離
室11に開口する。The bulkhead 6 of such a shield excavator,
Through the cutter drum 1, a strainer section 7 and a groundwater collecting pipe 8 are protruded from the tip of the cutter drum 1 in front of the cutter drum 1. The groundwater sampling pipe 8 is opened at one end of a water pipe 10 having a water pump 9 on the way, and the other end of the water pipe 10 is opened at the gas release chamber 11.
【００１６】このガス遊離室11は、内部のイブ近傍に攪
拌翼による攪拌機12を配設し、側壁の下部に排水管13を
連通してある。In the gas release chamber 11, a stirrer 12 with stirring blades is disposed near an internal eve, and a drain pipe 13 communicates with a lower portion of a side wall.
【００１７】前記送水管10に採取した地下水の量を計測
する流体流量計14を接続し、また、採取した地下水の温
度及び静水圧をそれぞれ計測する地下水温度検知器16
と、地下水圧検知器15とを地下水採取管８などに設け
る。A fluid flow meter 14 for measuring the amount of groundwater collected is connected to the water pipe 10, and a groundwater temperature detector 16 for measuring the temperature and hydrostatic pressure of the collected groundwater, respectively.
And the groundwater pressure detector 15 are provided on the groundwater sampling pipe 8 and the like.
【００１８】前記ガス遊離室11の上部に、途中にガス吸
引ポンプ17を設けたガス吸引管18の一端を連通し、該ガ
ス吸引管18の途中にガス遊離室11で地下水から遊離した
ガスの発生量を計測するガス流量計19を設け、ガス吸引
管18の他端にガスの濃度を計測する可燃性ガス検知器20
を設ける。One end of a gas suction pipe 18 provided with a gas suction pump 17 on the way is communicated with the upper part of the gas release chamber 11, and the gas released from the groundwater in the gas release chamber 11 in the gas release pipe 11 is provided on the gas suction pipe 18. A gas flow meter 19 for measuring the amount of generated gas is provided, and a combustible gas detector 20 for measuring the gas concentration at the other end of the gas suction pipe 18.
Is provided.
【００１９】以上のようにしてマイクロコンピュータ等
を利用するデータ処理装置21を設け、該データ処理装置
21に前記流体流量計14、地下水温度検知器16、地下水圧
検知器15、ガス流量計19及び可燃性ガス検知器20からの
計測信号を導入し、データ処理装置21の出力側に警報装
置22を接続した。As described above, the data processing device 21 utilizing a microcomputer or the like is provided.
The measurement signals from the fluid flow meter 14, the groundwater temperature detector 16, the groundwater pressure detector 15, the gas flowmeter 19 and the flammable gas detector 20 are introduced into 21, and an alarm device 22 is provided on the output side of the data processing device 21. Connected.
【００２０】次にかかる予知装置を用いて可燃性ガス発
生の予知を行う方法について説明する。メタンガスなど
の可燃性ガスは、地層中で地下水に溶解して存在する場
合と、ガス層を形成している場合とがあり、ガス層を形
成している場合は、その可燃性ガス層が高濃度である
程、その周辺の地下水には飽和に近い値でガスが溶解し
ている。Next, a method for predicting the generation of flammable gas by using such a prediction device will be described. Combustible gas such as methane gas may be dissolved in groundwater in the stratum, or may form a gas layer, and if a gas layer is formed, the combustible gas layer may be high. The higher the concentration, the more near-saturated the gas is dissolved in the surrounding groundwater.
【００２１】本発明方法は、この点に着目して地下水に
溶解している可燃性ガスの溶解度を検出することで、爆
発の危険性を判断するもので、まず、掘削機械の前部中
心部から突出させた地下水採取管８の先端のストレーナ
部７から、これから掘削しようとする地層内の地下水の
みを直接採取する。The method of the present invention focuses on this point and determines the danger of explosion by detecting the solubility of flammable gas dissolved in groundwater. Only the groundwater in the stratum to be excavated is directly collected from the strainer portion 7 at the tip of the groundwater sampling pipe 8 protruding from the groundwater.
【００２２】採取した地下水の採取量、温度及び静水圧
をそれぞれ液体流量計14と、地下水温度検知器16と、地
下水圧検知器15とによって計測する。The amount of collected groundwater, the temperature, and the hydrostatic pressure are measured by a liquid flow meter 14, a groundwater temperature detector 16, and a groundwater pressure detector 15, respectively.
【００２３】一方、採取された地下水は送水ポンプ９に
より送水管10を通って、ガス遊離室11に送られ、ここで
攪拌機12によって地下水の中に含有されているガスが遊
離される。遊離したガスは、ガス吸引ポンプ17によりガ
ス吸引管18を通ってガス流量計19によって発生量が計測
され、また、可燃性ガス検知器20により濃度が測定され
る。なお、ガス遊離室11でガスが遊離された水は、排水
管13から排出される。On the other hand, the collected groundwater is sent by a water pump 9 through a water pipe 10 to a gas release chamber 11, where a gas contained in the groundwater is released by a stirrer 12. The amount of released gas is measured by a gas flow meter 19 through a gas suction pipe 18 by a gas suction pump 17, and the concentration is measured by a combustible gas detector 20. The water from which gas has been released in the gas release chamber 11 is discharged from the drain pipe 13.
【００２４】流体流量計14、地下水温度検知器16、地下
水圧検知器15、ガス流量計19及び可燃性ガス検知器20か
らの計測信号はデータ処理装置21に送られ、ここで可燃
性ガスの濃度と飽和度が算出される。一般に、可燃性ガ
ス等の気体が水に溶解する量はヘンリーの法則に従い、
飽和溶解量は気体の種類によって異なるが、下記の計算
式により、圧力と温度が決まれば求められる。Measurement signals from the fluid flow meter 14, the groundwater temperature detector 16, the groundwater pressure detector 15, the gas flowmeter 19 and the flammable gas detector 20 are sent to a data processor 21 where the flammable gas is detected. The concentration and saturation are calculated. In general, the amount of gas such as flammable gas dissolved in water follows Henry's law,
The saturated dissolution amount varies depending on the type of gas, but can be obtained by determining the pressure and temperature by the following formula.
【００２５】Ｈm ＝Ｑm ×Ｃm ／Ｑm ／Ｈo ただし Ｈm ：飽和度（％） Ｈo ：可燃性ガスの飽和溶解量（ｃｃ／ｃｃ） （１ｃｃの水に溶解している可燃性ガスの量であり、測
定値Ｔo 及Ｐo をもとにヘンリーの法則により計算す
る。） 測定値 Ｑw ：地下水採取量（ｃｃ） Ｑm ：採取した地下水からのガス発生量（ｃｃ） Ｃm ；可燃性ガス濃度（％） Ｔo ：地下水温度（℃） Ｐo ：静水圧（Ｐａ）[0025] H m = Q m × C m / Q m / H o However H m: saturation (%) H o: dissolved in saturated dissolution amount of the combustible gas (cc / cc) (1cc of water is the amount of flammable gas, is calculated on the basis of the measured value T o及P o by Henry's law) measurements Q w:. groundwater collection volume (cc) Q m: the amount of gas generated from the collected groundwater ( cc) C m; flammability (%) T o: groundwater temperature (℃) P o: hydrostatic pressure (Pa)
【００２６】以上の測定値及び計算値をもとに、トンネ
ル内への可燃性ガス流入、爆発の危険性について下記の
表に示す基準を設定する。一般に、可燃性ガスは爆発を
起こす濃度範囲があり、例えばメタンガスでは５〜１５
％である。ただし、１５％以上の濃度の場合でも、空気
によって希釈され爆発濃度範囲となるため、通常、爆発
下限界濃度（メタンガスでは５％）を越えると危険と判
断している。Based on the above measured values and calculated values, the criteria shown in the following table are set for the risk of inflammable gas flowing into the tunnel and explosion. In general, flammable gas has a concentration range in which explosion occurs.
%. However, even in the case of a concentration of 15% or more, since it is diluted with air to be in an explosive concentration range, it is generally judged to be dangerous if the concentration exceeds the lower explosive limit concentration (5% for methane gas).
【００２７】[0027]
【表１】 [Table 1]
【００２８】そして、データ処理装置21では前記の表に
示した基準をもとにして危険度を判定し、警報装置22に
出力して危険度に応じた必要な警報を行う。Then, the data processing device 21 determines the degree of danger based on the criteria shown in the above table, and outputs it to the alarm device 22 to give a necessary alarm according to the degree of danger.
【００２９】前記第１実施例では、地下水を直接採取し
たが、第２実施例では、掘削した土砂を採取して、掘削
土砂中の地下水に含まれている可燃性ガスを検知するよ
うにした。In the first embodiment, groundwater is directly collected. In the second embodiment, excavated earth and sand is sampled to detect flammable gas contained in groundwater in the excavated earth and sand. .
【００３０】図３は第２実施例の説明図で、例えば図４
に示すような削機械である土圧式のシールド機に実施さ
れるもので、掘削機械は、周知のように端部に開閉ゲー
トを有し、チャンバ２からの掘削土砂を搬送するスクリ
ューコンベア23とベルトコンベア24を備えている。FIG. 3 is an explanatory view of the second embodiment.
The drilling machine is implemented as an earth pressure type shield machine, which is a cutting machine as shown in the figure. A belt conveyor 24 is provided.
【００３１】かかる掘削機械においてチャンバ２内に掘
削土砂採取用のスクリューコンベア25の先端の土砂取り
入れ口26を突出させて配設し、該スクリューコンベア25
に採取した掘削土砂の採取量を計測する土砂流量計27
と、土砂に含まれる水分の率を計測する土砂含水率計28
を設ける。図中29は、該スクリューコンベア25の駆動用
のモータを示す。In such an excavating machine, the earth and sand intake 26 at the tip of a screw conveyor 25 for excavating earth and sand is protruded and arranged in the chamber 2.
Flow meter that measures the amount of excavated sediment collected in the area27
And a soil moisture meter 28 that measures the percentage of water contained in the soil
Is provided. In the figure, reference numeral 29 denotes a motor for driving the screw conveyor 25.
【００３２】スクリューコンベア25の排出端に土砂攪拌
ガス遊離室30を設け、該土砂攪拌ガス遊離室30内の底部
に攪拌機31としてのスクリューコンベアを配設し、この
スクリューコンベアの排出端に位置させて土砂攪拌ガス
遊離室30の底部に土砂排出口32を形成した。At the discharge end of the screw conveyor 25, a sediment-stirred gas release chamber 30 is provided, and at the bottom of the sediment-stirred gas release chamber 30, a screw conveyor as a stirrer 31 is disposed. The earth and sand discharge port 32 was formed at the bottom of the earth and sand stirring gas release chamber 30.
【００３３】土砂攪拌ガス遊離室30の上部には第１実施
例と同様にして、途中にガス吸引ポンプ17を設けたガス
吸引管18の一端を連通する。なお、その他の構成は第１
実施例と同様であるから、ここでは同一の参照符号を付
して、詳細な説明は省略するが、地下水圧検知器15と地
下水温度検知器16とは、掘削土砂採取用のスクリューコ
ンベア25等に設け、前記土砂流量計27と土砂含水率計28
はデータ処理装置21の入力側に接続する。As in the first embodiment, one end of a gas suction pipe 18 provided with a gas suction pump 17 is connected to the upper part of the earth / sand stirring gas release chamber 30 in the same manner as in the first embodiment. Other configurations are the first
Since the embodiment is the same as the embodiment, the same reference numerals are given here and the detailed description is omitted, but the groundwater pressure detector 15 and the groundwater temperature detector 16 are a screw conveyor 25 for excavated sediment and the like. And the earth and sand flow meter 27 and the earth and sand moisture content meter 28
Is connected to the input side of the data processing device 21.
【００３４】次に予知方法を説明すると、チャンバ２内
に取り込んだ掘削土砂を土砂取り入れ口26から掘削土砂
採取用のスクリューコンベア25で土砂攪拌ガス遊離室30
に搬入する。なお、この間に、土砂流量計27で掘削土砂
の採取量を計測し、土砂含水率計28で土砂に含まれる水
分の率を計測する。Next, a prediction method will be described. The excavated sediment taken into the chamber 2 is fed from the sediment intake 26 by the screw conveyer 25 for collecting excavated sediment from the sediment stirring gas release chamber 30.
Carry in. During this time, the amount of excavated sediment collected is measured by the sediment flow meter 27, and the percentage of water contained in the sediment is measured by the sediment moisture content meter 28.
【００３５】土砂攪拌ガス遊離室30に搬入した土砂は、
ここで攪拌機31としてのスクリューコンベアによってガ
スが遊離され、土砂は土砂排出口32から排出され、ガス
は上部のガス吸引ポンプ17によりガス吸引管18を通って
ガス流量計19によって発生量が計測され、また、可燃性
ガス検知器20により濃度が測定される。The sediment carried into the sediment mixing gas release chamber 30 is
Here, gas is liberated by a screw conveyor as a stirrer 31, sediment is discharged from a sediment discharge port 32, and the amount of gas generated is measured by a gas flow meter 19 through a gas suction pipe 18 by a gas suction pump 17 on the upper side. The concentration is measured by the combustible gas detector 20.
【００３６】そして、データ処理装置21に前記土砂流量
計27、土砂含水率計28、地下水温度検知器15、地下水圧
検知器16、ガス流量計19及び可燃性ガス検知器20からの
計測信号を送り、データ処理装置21ではこれらのデータ
をもとに爆発発生の危険度を判定し、警報装置22に出力
して危険度に応じた必要な警報を行う。The measurement signals from the sediment flow meter 27, the sediment moisture content meter 28, the groundwater temperature detector 15, the groundwater pressure detector 16, the gas flowmeter 19, and the flammable gas detector 20 are sent to the data processor 21. The data processing device 21 determines the degree of danger of explosion based on these data, and outputs it to the alarm device 22 to issue a necessary alarm according to the degree of danger.
【００３７】[0037]
【発明の効果】以上述べたように本発明の可燃性ガス発
生の予知方法及び装置は、ガスが実際にトンネル内に流
入する前に地層中に含まれるガスを直接検知するから、
地層中でのガス発生そのものを検知でき、広範囲におけ
るガス発生ひいてはガス爆発の危険性を予知でき、安全
性を高めることのできるものである。As described above, the method and apparatus for predicting the generation of combustible gas of the present invention directly detects gas contained in the formation before the gas actually flows into the tunnel.
It can detect the gas generation itself in the stratum, can predict the gas generation in a wide area, and can predict the danger of gas explosion, and can enhance the safety.
【図１】本発明の可燃性ガス発生の予知装置の第１実施
例を示す説明図である。FIG. 1 is an explanatory diagram showing a first embodiment of a device for predicting combustible gas generation according to the present invention.
【図２】本発明の可燃性ガス発生の予知装置の第１実施
例が実施される掘削機械の要部の説明図である。FIG. 2 is an explanatory diagram of a main part of an excavating machine in which a first embodiment of the apparatus for predicting combustible gas generation according to the present invention is implemented.
【図３】本発明の可燃性ガス発生の予知装置の第２実施
例を示す説明図である。FIG. 3 is an explanatory view showing a second embodiment of a device for predicting combustible gas generation according to the present invention.
【図４】本発明の可燃性ガス発生の予知装置の第２実施
例が実施される掘削機械の要部の説明図である。FIG. 4 is an explanatory diagram of a main part of an excavating machine in which a second embodiment of the apparatus for predicting combustible gas generation according to the present invention is implemented.
１…カッタードラム ２…チャンバ ３…送泥管 ４…排泥管 ５…アジテータ ６…バルクヘッド ７…ストレーナ部 ８…地下水採取管 ９…送水ポンプ 10…送水管 11…ガス遊離室 12…攪拌機 13…排水管 14…液体流量計 15…地下水圧検知器 16…地下水温度検知
器 17…ガス吸引ポンプ 18…ガス吸引管 19…ガス流量計 20…可燃性ガス検知
器 21…データ処理装置 22…警報装置 23…スクリューコンベア 24…ベルトコンベア 25…掘削土砂採取用のスクリューコンベア 26…土砂取り入れ口 27…土砂流量計 28…土砂含水率計 29…モータ 30…土砂攪拌ガス遊離室 31…攪拌機 32…土砂排出口DESCRIPTION OF SYMBOLS 1 ... Cutter drum 2 ... Chamber 3 ... Mud pipe 4 ... Drain pipe 5 ... Agitator 6 ... Bulkhead 7 ... Strainer part 8 ... Groundwater sampling pipe 9 ... Water pump 10 ... Water pipe 11 ... Gas release chamber 12 ... Stirrer 13 ... drain pipe 14 ... liquid flow meter 15 ... groundwater pressure detector 16 ... groundwater temperature detector 17 ... gas suction pump 18 ... gas suction pipe 19 ... gas flow meter 20 ... flammable gas detector 21 ... data processing device 22 ... alarm Equipment 23 ... Screw conveyor 24 ... Belt conveyor 25 ... Screw conveyor for excavation and sediment extraction 26 ... Sediment intake 27 ... Soil and sand flow meter 28 ... Soil and soil moisture content meter 29 ... Motor 30 ... Sediment agitated gas release chamber 31 ... Agitator 32 ... Sediment Vent
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) G08B 21/16 E21D 9/06 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) G08B 21/16 E21D 9/06
Claims (4)
から掘削に先立って地下水のみを直接採取し、この地下
水の採取量、温度、静水圧を計測するとともに地下水に
含有されている可燃性ガスを遊離し、このガスの発生量
と濃度とを計測し、これらのデータにより可燃性ガスの
溶解量と飽和溶解量、その飽和度を算出することを特徴
とする可燃性ガス発生の予知方法。1. Prior to excavation, only groundwater is directly sampled from a stratum to be excavated in advance of an excavating machine, and the amount, temperature, and hydrostatic pressure of the groundwater are measured, and flammable gas contained in the groundwater is measured. A method for predicting the generation of combustible gas, comprising measuring the amount and concentration of the generated gas and calculating the dissolved and saturated dissolved amounts of the combustible gas and the saturation based on these data.
土砂の重量と土砂含水率、土砂中の地下水の温度、静水
圧を計測するとともに掘削土砂に含有されている可燃性
ガスを遊離し、このガスの発生量と濃度とを計測し、こ
れらのデータにより可燃性ガスの溶解量と飽和溶解量、
その飽和度を算出することを特徴とする可燃性ガス発生
の予知方法。2. The excavation machine collects excavated earth and sand, measures the weight of the earth and sand, the water content of the earth and sand, the temperature of groundwater in the earth and sand, the hydrostatic pressure, and releases the combustible gas contained in the earth and sand. , The amount and concentration of this gas are measured, and based on these data, the amount of flammable gas dissolved and saturated dissolved,
A method for predicting generation of combustible gas, comprising calculating the degree of saturation.
と、該地下水採取管が開口するガス遊離室と、前記地下
水採取管で採取した地下水の採取量、温度及び静水圧を
それぞれ計測する液体流量計と、地下水温度検知器と、
地下水圧検知器と、ガス遊離室で地下水から遊離したガ
スの発生量と濃度とをそれぞれ計測するガス流量計と、
可燃性ガス検知器と、地下水の採取量、温度、静水圧、
ガスの発生量と濃度などのデータにより可燃性ガスの溶
解量と飽和溶解量、その飽和度を算出するデータ処理装
置とにより構成することを特徴とする可燃性ガス発生の
予知装置。3. A groundwater sampling pipe provided at the front of the excavating machine, a gas release chamber in which the groundwater sampling pipe opens, and an amount, temperature, and hydrostatic pressure of the groundwater collected by the groundwater sampling pipe are measured. Liquid flow meter, groundwater temperature detector,
A groundwater pressure detector, a gas flow meter for measuring the amount and concentration of gas released from groundwater in the gas release chamber, respectively,
Combustible gas detector, groundwater sampling volume, temperature, hydrostatic pressure,
An apparatus for predicting the generation of combustible gas, comprising: a data processing device for calculating the dissolved amount and saturated dissolved amount of combustible gas based on data such as gas generation amount and concentration, and the degree of saturation.
取用のスクリューコンベアと、該スクリューコンベアの
排出端に配設する土砂攪拌ガス遊離室と、前記スクリュ
ーコンベアで採取した掘削土砂の流量と土砂含水率、土
砂中の地下水の温度、静水圧をそれぞれ計測する土砂流
量計と、土砂含水率計と、地下水温度検知器と、地下水
圧検知器と、土砂攪拌ガス遊離室で土砂から遊離したガ
スの発生量と濃度とをそれぞれ計測するガス流量計と、
可燃性ガス検知器と、土砂の流量と土砂含水率、土砂中
の地下水の温度、静水圧、ガスの発生量と濃度などのデ
ータにより可燃性ガスの溶解量と飽和溶解量、その飽和
度を算出するデータ処理装置とにより構成することを特
徴とする可燃性ガス発生の予知装置。4. A screw conveyor for collecting excavated sediment provided at the front inside the excavating machine, a sediment agitated gas release chamber disposed at a discharge end of the screw conveyor, and a flow rate of excavated sediment collected by the screw conveyor. Sediment flow rate, soil water content meter, soil water content meter, groundwater temperature detector, groundwater pressure detector, and soil sediment released from sediment in the sediment agitated gas release chamber. A gas flow meter for measuring the gas generation amount and concentration, respectively,
The combustible gas detector and the data on the flow rate of sediment and the water content of the sediment, the temperature of the groundwater in the sediment, the hydrostatic pressure, the amount of generated gas and the concentration, etc. An apparatus for predicting the generation of combustible gas, characterized by comprising a data processing device for calculating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07069243A JP3081904B2 (en) | 1995-03-28 | 1995-03-28 | Method and apparatus for predicting combustible gas generation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07069243A JP3081904B2 (en) | 1995-03-28 | 1995-03-28 | Method and apparatus for predicting combustible gas generation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08263772A JPH08263772A (en) | 1996-10-11 |
| JP3081904B2 true JP3081904B2 (en) | 2000-08-28 |
Family
ID=13397125
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07069243A Expired - Fee Related JP3081904B2 (en) | 1995-03-28 | 1995-03-28 | Method and apparatus for predicting combustible gas generation |
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| Country | Link |
|---|---|
| JP (1) | JP3081904B2 (en) |
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| CN104833773B (en) * | 2015-04-21 | 2016-06-15 | 浙江科技学院 | A kind of compound portable Tunnel Blasting gas dirt Real-Time Monitoring single control system and device processed |
| JP6600578B2 (en) * | 2016-02-12 | 2019-10-30 | 博 堀江 | Combustible gas ejection prediction device at the time of earthquake |
| CN108765887A (en) * | 2018-08-06 | 2018-11-06 | 扬中市南方矿用电器有限公司 | A kind of coal mine pipeline carbon monoxide transducer and its application process |
| JP7349087B2 (en) * | 2020-09-30 | 2023-09-22 | 博 堀江 | Combustible gas eruption prediction device and combustible gas eruption risk determination device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| NO20191352A1 (en) * | 2019-11-14 | 2021-05-17 | Searas As | Method for determining the amount of a gas dissolved in a liquid |
Also Published As
| Publication number | Publication date |
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| JPH08263772A (en) | 1996-10-11 |
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