JP2533811B2 - Shield machine - Google Patents

Description

The present invention relates to a shield machine used when constructing a tunnel in the ground.

(Prior art) In the conventional blind shield and earth pressure type shield, as a method of excavation management to make the amount of excavated soil equal to the amount of excavated soil, for example, in the case of earth pressure type shield, the excavated soil assumed by soil investigation by boring is used. Amount and the amount of additive injection, and the method of adjusting the amount of earth and sand discharged by the rotation speed of the screw conveyor, which is the earth discharging device, and receiving the soil discharged from the screw conveyor to the Zuritro. Zuritro is a method for measuring the total weight of soil and the method disclosed in Japanese Patent Application Laid-Open No. 1-1460
As shown in No. 98, excavation management is performed by matching the amount of soil discharged obtained by the method of measuring the amount of soil discharged with a flowmeter with a density / moisture measuring device that uses RI for the soil discharging device such as a screw conveyor. Is being done.

(Problems to be solved by the invention) However, in the method of assuming the excavated soil amount and the soil discharge amount from the rotation speed of the screw conveyor as described above, the soil is discharged and the properties of the soil discharge, that is, the slump, the water content ratio, etc. Due to the different soil efficiency, there was a problem that it could not be said to be reliable under various soil conditions.

In addition, as described above, the method of measuring the weight of the soil dumped in the Zuritro is also inaccurate.In addition, as mentioned above, the conventional soil dumping device is equipped with a RI density / moisture meter and flowmeter. In the method of measuring the amount of soil by providing it, the conditions of the ground such as density, water content and water content of the ground to be excavated are obtained from a few boring data, so the data is partial and the weight of the soil discharged can be calculated. Even if it could be confirmed, there was a problem that it was insufficient to compare the excavated soil with the discharged amount.

(Means for Solving the Problems) The present invention has been proposed in order to solve these problems, and an object of the present invention is to measure the density and the water content ratio of the ground in the excavation of the shield. A shield machine that understands the amount of soil discharged and the density and / or water content of the soil discharged, enables reliable management of the amount of soil discharged, that is, excavation management, and minimizes subsidence on the ground surface or underground. To provide.

In order to achieve the above object, the present invention provides a partition wall in the front part of the shield cylinder, and a face chamber is provided through this partition wall.
In a shield machine in which a soil discharging device is connected to the face chamber, a density / water content measuring device for measuring density and / or water content by using a radioisotope (RI) is provided in an excavating tool and / or a partition wall, and The soil device is equipped with a device for measuring the density and / or water content of the discharged soil, and the amount of discharged soil, and the density / moisture measuring device holds the detection capsule telescopically with a jack and uses the jack etc. In addition, a density / moisture measuring instrument is installed on the bulkhead, and when the excavator is stopped, it is pushed into the face chamber by a jack, etc., and the main body is pushed against the ground to measure the soil quality. Alternatively, the density / moisture measuring device includes a casing, a screw conveyor provided in the casing, a shaft thereof, and a cap provided at a tip thereof and having a cutter bit. The radioisotope (RI) source is built into the cutter bit that can penetrate into the ground and excavate, and the radiation is measured by the detector at the rear. As for the vessel, the radiation source is provided in the copy cutter incorporated in the spoke, the copy cutter is inserted into the ground by extending the jack provided in the spoke, and the radiation is detected by the detector at the tip of the spoke. The main point is to manage the amount of discharged soil, that is, excavation control, by matching the weight of excavated soil particles with the weight of discharged soil particles.

(Function) A density / water content measuring device for measuring density and / or water content using a radioisotope is provided at an appropriate position and / or a partition of an excavating tool for face excavation of a shield machine. In addition, in the soil discharging device, from the density and moisture content of the soil discharged and the soil discharged amount detected by the density / water content measuring device and the soil discharging amount measuring device, the weight of the discharged soil particles per unit time is measured, The excavation of the shield machine is controlled so that the weight of the discharged soil particles and the weight of the excavated soil particles per unit time are matched.

(Embodiment 1) FIGS. 1 (a) and 1 (b) are a front view and a vertical sectional view of an earth pressure type shield machine 1 showing a first embodiment of the present invention. In the shield machine 1 of this embodiment, the face 4 of the excavation portion is excavated by the excavator 3 on the front surface of the shield outer cylinder 2, and the excavated earth and sand 5 is filled in the face chamber 6 to mainly excavate. While holding the cutting face 4 with the mixture of the earth and sand 5 and the additive injected from the inside of the machine, the soil 7 corresponding to the amount of excavated soil is discharged through the soil discharging device 8 such as a screw conveyor or a belt conveyor. While digging while. The structure of the excavator 3 is a spoke, an excavation bit, a copy cutter, a fishtail, or the like.

That is, in the figure, 9 is a spoke that constitutes the excavator 3, 10
Is a drill bit attached to the front part of the spoke 9 of the drill tool 3, and a rotary shaft 11 connected to the drill tool 3 is rotatably supported by a bearing provided in the partition wall 12. Further, an excavation tool drive motor 13 is connected to the rotary shaft 11 to drive the excavation tool 3, and a screw conveyor motor 14 for driving the excavation tool 3 is attached to the screw conveyor 8.

The segment 15 is constructed in a substantially cylindrical shape along with the excavation,
The gap between the ground G and the segment 15 is filled with a filling material such as the backing material 16.

Therefore, in this embodiment, when there are spoke 9 face plates for directly measuring the soil quality of the face 4, the face chamber 6 and the ground G, the face / plate has a density and / or water content for measuring the density and / or the water content. Measuring devices 31a are provided respectively. Further, members such as steel plates to which the respective density / moisture measuring devices 31a are attached have a thickness that does not hinder the measurement, and can be freely attached and detached. The density / moisture measuring device 31a provided on the spoke 9 is located on the outer peripheral side, and the excavation tool 3 rotates once to measure substantially the entire excavated cross section. A cable 32 for taking out the obtained data signal is connected to the density / water content measuring device 31a. In addition,
In the figure, numeral 17 is an earth discharging pipe of the earth discharging device 8, 31c is a density / moisture measuring device provided in the earth discharging pipe 17, and 61 is a flow rate measuring device provided in the earth discharging pipe 17.

Next, referring to FIGS. 2A and 2B, a density / water content measuring device 31a according to an embodiment of the present invention will be described.

FIG. 2 (a) is a longitudinal sectional view of the density / moisture measuring device 31a in a state where the detection capsule 33 is extended and detected, and FIG. 2 (b).
FIG. 6 is a diagram in which the detection capsule 33 is housed in a shielding box 34.

That is, the detection capsule 33 is connected to the jack 36 provided in the shielding box 34, and can be freely expanded and contracted through this jack 36. At the time of detection, the detection capsule 33 is in an expanded state as shown in (a) and at that position. If it can be fixed and not detected,
As shown in (b), it can be stored in the shielding box 34 and can be freely taken in and out of the shielding box 34. Further, since the tip of the detection capsule 33 is provided with the cemented carbide tip 33-1 or is reinforced by the hardened padding or the like, it is possible to penetrate the natural ground G by the jack 36 or the like.

The density / moisture analyzers 31a and 31c are radioactive isotopes RI.
(Radioisotope), detection capsule
A radiation source 35 is provided inside the 33, and the detection capsule 33
A seal 37 is provided on the outer circumference of the standard body 38 for detecting radiation from the radiation source 35 and a detector in the shielding box 34.
39 etc. are provided.

Note that the radiation source 35 is a radioactive substance that emits radiation, for example, cobalt 60 (Co-60) for density measurement or californium 252 (Cf-252) for water content measurement placed in a stainless steel cylindrical container. Is used.

The detector 39 is connected to the first arithmetic unit 40, the display 41 and the second arithmetic unit 42 via cables 32a, 43a and 43a '.

FIG. 3 shows an example of a device to be installed in the shield machine 1 which is a place for repairing the density / moisture measuring device 31a in order to repair the density / moisture measuring device 31a having the above structure.・ The moisture measuring device 31a is housed in the spoke 9,
In order to remove this, a cylinder 47 penetrating the partition wall 12 is provided, the tip of the cylinder 47 is connected to the rear part of the spoke 9 to which the density / moisture measuring instrument 31a is attached, and the rear end of the cylinder 47 is a lid. Cover with body 47a, in this case a seal 48,
49 is provided to make a sealed state in the cylinder 47. Then, the removal rod 50 is provided in the cylinder 47, and the tip of the removal rod 50 is
Connected to the grip block 51 at the rear of the moisture measuring device 31a, the rear end is connected to the jack 46 at the rear of the lid 47a,
Grasp the grip block 51 at the rear of the density / moisture measuring device 31a with the stick 50 for removal, and press the density /
Remove the water content meter 31a. Then, after being repaired or the like in the shield machine 1, it is returned to the original state when attached.

In addition, in the above-mentioned embodiment, as the measuring device, the one for measuring both the density and the moisture has been described as an example, but when only one of the measuring devices is sufficient, it is needless to say that the measuring device may have only one measuring device. Is.

In operation, the radiation R emitted from the radiation source 35 is applied to the detector 33 through the detection capsule 33 and the ground G, and the radiation amount at this time is measured to measure the density and moisture in the ground G. The quantity can be measured.

However, radioactive materials usually have a half-life, and the radiation dose is attenuated over time. However, the above-mentioned cobalt 60 (Co-60) and californium 252 (Cf-2
52) has a relatively short half-life, so a certain period, for example, 1
It is necessary to measure the degree of attenuation of the radiation source 35 about once a week.

In this embodiment, the object to be measured is the ground G that constantly changes with the excavation, and the calibration method shown in FIG. 2B will be described below.

The radiation source 35 in the detection capsule 33 is housed in the shielding box 34 by the jack 36 as described above, and the radiation R is applied to the standard body 38, and passes through the standard body 38 to enter the detector 39. Then, the measured value is compared with the value obtained by measuring the amount of passing radiation of the standard body 38 in advance, and the attenuation of the radiation of the radiation source 35 is confirmed to check the calculation device 4
Correct 0,42.

The standard body 38 is formed of a substance that is physically and chemically stable and hardly deteriorates over time, such as acrylic or glass.

The frequency of calibration depends on the radiation intensity of the radiation source 35. If the radiation source 35 has a total dose of cobalt 60 (Co-60) or californium 252 (Cf-252) of 100 microcurie or less, As it is not subject to legal restrictions, no special handling qualification is required, and calibration once a week is sufficient.

Here, the principle of density measurement of the ground G will be described. Rock G
As described above, cobalt 60 (Co-6
0) gamma rays are used.

The interaction between gamma rays and the electrons contained in the substance to be measured includes photoelectric effect, Compton effect, electron pair generation, etc. Among them, the one called the Compton effect is mainly used.

The Compton effect is a phenomenon in which when gamma rays pass through the soil, they collide with electrons in the soil and give a part of the energy to the electrons in the soil, so that the energy itself becomes small.
The rate of reduction is proportional to the number of electrons encountered on the way.

In addition, an electrically neutral substance contains as many protons as electrons, and similarly, the ratio of the number of protons to the number of neutrons is almost constant in many substances. The density can also be regarded as proportional to the electron density.

That is, since the density of the substance is the sum of the proton density and the neutron density, the density can be obtained from the passing amount of gamma rays by utilizing the relationship between the density of electrons and the density of the substance.

On the other hand, in the measurement of the water content of the natural ground G, a neutron beam of californium 252 (Cf-252) is used as the radiation source 35.

This measurement principle is to detect the transmitted fast neutrons while colliding with the nuclei other than hydrogen nuclei in the soil between the radiation source 35 and the detector 39.

Here, since fast neutrons have high energy, it is impossible to detect them as they are with a detection tube, and a moderator (for example, an acrylic resin containing many hydrogen atoms) may be placed around them to detect them. Measurement is performed by decelerating to thermal neutrons.

By doing this, the density of hydrogen nuclei in the substance can be obtained, and since hydrogen in the soil is mostly contained as a constituent element of water (H ₂ O), the water content, that is, the water content ratio, can be calculated. Can be measured.

Next, referring to FIG. 4 (a) and FIG. 4 (b),
The configuration and operation of a general flow rate measuring device 61 will be described.

Flowmeters generally used for flow rate measurement include electromagnetic flowmeters and ultrasonic flowmeters.
As a result, regardless of the diameter of the drain pipe 17,
An ultrasonic flowmeter or the like that can be used for measurement by simply attaching it to the outer surface of the is used.

Transducer 63 connected to flow velocity measuring device 62 of flow rate measuring device 61
Incorporates both a transmitting element 64 for transmitting ultrasonic waves and a receiving element 65 for receiving ultrasonic waves, and converts the ultrasonic waves into electric current or the electric current into ultrasonic waves.

Further, the flow rate measuring device 61 has a guide 66 for moving the converter 63.
And a moving jack 67, a speed detector 68 for detecting the moving speed of the moving jack 67, and a cable 69 for transmitting an electric signal output from the speed detector 68 and the flow velocity measuring device 62.
a, 69b, the 1st arithmetic unit 40 which calculates the true discharge flow rate by inputting and calculating the electric signal of each cable 69a, 69b
A, indicator 70 for displaying the calculated true flow rate and second
It is composed of a computing device 42A and the like.

The first arithmetic unit 40A, the indicator 70 and the second arithmetic unit 42A are connected via cables 43a and 43a '.

The principle of the measurement is that the current generated by the flow velocity measuring device 62 is converted into ultrasonic waves by the transmitting element 64 in the converter 63, and the transmitted ultrasonic waves pass through the wall of the soil discharge pipe 17 and the particles in the soil 7 are discharged. When it hits a bubble or a pressure boundary surface, it is reflected and reaches the receiving element 65.

At this time, since the frequency of the reflected ultrasonic wave changes in proportion to the flow velocity of the soil 7, a difference occurs between the transmission frequency and the reception frequency, and the flow velocity measuring device 62 calculates the difference between these frequencies to obtain the flow velocity. Can be measured.

However, when the flow velocity V _{1 of the} soil discharge 7 passing through the pipe is very slow, for example, when V ₁ = 0.1 to 0.15 m / sec or less, the difference in frequency becomes extremely small, and even if this is amplified and measured. It becomes almost impossible to measure because it becomes indistinguishable from noise from the surroundings and measurement error increases.

In such a case, the flow rate measuring device 61 has a moving jack 67 attached to the converter 63, as shown in FIG. ) and by moving at a suitable rate V ₂ in the opposite direction, the relative velocity V ₃ of the dumping be measured with transducer 63 and a flow rate measuring device 62 becomes _{V 3 = V 1 + V 2} .

Therefore, the moving speed V ₂ of the converter 63 is measured by mounting the electric speed detector 68 in parallel with the moving jack 67 as shown in FIG. 4, and inputs the electric signal to the first arithmetic unit 40. At the same time, the relative velocity V ₃ measured by the flow velocity measuring device 62 is similarly input to the first arithmetic unit 40 by an electric signal, and if V ₁ = V ₃ −V ₂ is calculated in this, a true accurate result can be obtained. The soil discharge velocity V ₁ can be obtained.

It should be noted that if grease or the like is applied between the outer surfaces of the converter 63 and the soil discharge pipe 17 to eliminate the air layer, ultrasonic waves are easily transmitted, and the portion of the soil discharge pipe 17 that is in contact with the converter 63 is superposed. It is needless to say that it is preferable and preferable to manufacture it with an epoxy resin plate or the like through which sound waves can easily pass.

Further, a part of the earth discharging pipe 17 in contact with the converter 63 may be movable together with the moving jack 67.

In addition, if the soil discharge velocity is sufficiently high, the converter 63
Needless to say, there is no need to move.

Further, an electromagnetic flow meter or the like may be used instead of ultrasonic waves.

Next, an example of a method of managing excavation of the shield machine 1 based on the amount of excavated soil and the amount of excavated soil obtained as described above will be described.

Here, the excavation speed of the shield machine 1 is V ₁ (m / min), the excavation cross-sectional area of the shield machine 1 is A ₁ (m ² ), and the wet unit volume weight of the soil 4 of the excavated ground G is γ _t1 (t / m ³ ), the weight of excavated soil particles per unit time (per minute) W _s1 (t / min)
Is represented by W _s1 = (γ _t1 −W _w1 ) × V ₁ × A ₁ .

Here, W _w1 is the water content.

γ _t1 is measured by the density / moisture measuring device 31a provided on the outermost side of the spoke 9 of the rotary cutter 3, and the γ _t1 of the entire excavated cross section can be known by rotating the spoke 9. In addition, this density / water content measuring device 31a
When it is necessary to repair and calibrate, the spoke 9 is mounted like a cassette type, and by extending the above-mentioned attachment / detachment device from the rear bulkhead 12, it can be incorporated into the shield machine 1 for repair work or the like. This is as described above. In the shield machine 1 in which the passage for the rotary shaft 11 can be provided, the density / moisture measuring instrument 31a can be removed and calibrated by using the passage, and then returned to the original state. The same applies to the density / water content measuring device 31c.

Also, a density / moisture measuring device provided on the spoke 9
Since 31a can measure the entire excavation cross section, for example,
As shown in the figure, the average wet unit volume weight γ is obtained as follows: γ = (γ _s × A × γ _s × A + γ _s × A) / A even when the excavated cross sections are in alternate layers.

In addition, γ _s , γ _s , γ _s : wet unit volume weight of each soil layer, A, A, A: cross-sectional area of each soil layer.

 Therefore, the soil quality of the excavated section can be grasped more accurately.

Since V ₁ is detected by a speedometer of a shield jack (not shown), and A ₁ is known and does not change, W _s1 is V ₁ , A ₁ , γ _t1 , W ₁ 2 The weight of excavated soil particles per unit time can always be measured by inputting and calculating to the arithmetic unit 42.

The powder weight W _B of the additive to be injected is the flow rate Q measured by the flow meter, the additive specific gravity β _B, and the concentration N (powder weight of additive /
From the weight of water × 100), it is represented by W _B / W _W3 × 100 = N W _W3 / β _w + W _B / β _B = Q ∴W _B = Q / (100 / N + 1 / β _B ). In the above, W _w3 : water content, β _w :
It is the specific gravity of water.

Also, a density / moisture measuring device provided in the soil discharging device 8
The soil particle weight W _s2 of the discharged soil measured by 31c and the flow meter 41 is expressed by W _s2 = (γ _t2 −W _w2 ) × V ₂ × A ₂ . In this case, W _{w2 is the} water content.

In addition, γ _t2 is the wet unit volume weight of the soil discharge, V ₂ is the soil discharge velocity, and A ₂ is the cross-sectional area of the soil discharge device.

The obtained W _s1 and W _B and W _s2 are compared, and W _s2 = W
If excavation is managed by appropriately adjusting the rotation speed of the soil discharging device 8 and the propulsion speed of the shield jack so that _B + W _s1 , the amount of excavated soil will be taken in too much, and the amount of soil excavated in the ground will be reduced. The displacement and deformation of the ground surface can be minimized. Also, the optimum excavation control earth pressure can be set.

FIG. 6 is a flow chart showing an example of the excavation management method of the present invention. Before starting excavation, theoretical set values such as excavation speed, additive injection amount, screw conveyor rotation speed and controlled earth pressure are input in advance. Keep it. Then, when the excavation is started, the density G and the amount of water in the earth and sand in the screw conveyor, the excavation speed, the discharge flow rate, and the additive flow rate are measured during the excavation.

By inputting these measured values into the arithmetic unit, the excavated soil particle weight W _s1 , the additive powder weight W _B , and the excavated soil particle weight W W
calculates the value of _s2, performing W _s2 = W _s1 + W adjusted to excavation manage speed and Gilles de jack speed of the screw conveyor or the like so as to maintain the relationship of _B. For comparison of W _s2 and W _s1 + W _B , an allowable range of control values can be set in advance, and excavation can be managed within this allowable range.

When no additive is injected, W _B = 0 and W
Excavation management is performed so that _s2 = W _s1 .

Here, the powder weight of the additive is small compared with the soil particle weight of the excavated soil, and when a part of the additive escapes to other than the excavation part, the amount is very small, No problem.

(Embodiment 2) FIG. 7 shows a second embodiment of the present invention. In this embodiment, the density / water content measuring device 31 ″ provided on the partition wall 12 has a jack 44 when the excavator 3 is stopped. It is pushed out to the side of the face chamber 6 by pushing the main body against the ground face G of the face and the detection capsule 33 is inserted to measure the soil quality. When the density / moisture measuring device 31 ″ of the spoke 9 penetrates, It is characterized in that it is stopped at a position where it does not exist, and that the measurement is made to reach the natural ground G of the face without fail. In addition, a suitable number of the density / moisture measuring devices 31 ″ are arranged, and the soil quality in the excavated cross section can be measured at each attachment position as needed. In this embodiment, the blind shield or the like is used. Applicable.

It is also possible to construct a shield machine by using this embodiment and the first embodiment together.

(Embodiment 3) FIG. 8 is a third embodiment of the present invention. In this embodiment, a radioactive source of radioisotope (RI) is built in a curler bit at the tip of a rotary excavator, and a rear detector is used. It is a density / moisture measuring instrument that receives radiation for measurement.

In this example, since the ground G can be deeply penetrated, data of many grounds can be obtained. It is also possible to measure the soil in the face chamber.

The structure of the rotary excavator 90 has a cutter 91 at the tip,
It is provided on the shaft of the screw conveyor 92 located behind it. The earth and sand excavated is taken into the casing 93. The method of penetration is to open the well gate 94 and extend the jack 95 at the rear while cutting with the drive device 97.
Rotate 91 and screw conveyor 92 to proceed with digging.
A seal 96 is installed at the wellhead to stop water.

The external dimensions of this rotary excavator are suitable for measurement, are compactly configured, and satisfy the mechanical strength required for excavation.

As many pieces as necessary for measurement are provided. Further, the installation position is appropriately provided at an optimum position.

(Embodiment 4) FIG. 9 shows a fourth embodiment of the present invention, in which a source 35 of a density / moisture measuring instrument is provided in a copy cutter 81 incorporated in a spoke 9. Then, the copy cutter 81 is inserted into the natural ground G by extending the jack 83 provided in the spoke 9, and the radiation R is detected by the detector 39 at the tip of the spoke 9. The copy cutter 81 excavates the surrounding natural ground G and has sufficient strength. Also, since it is expandable and contractible, the source 35 and detector can be
Calibration can be performed by providing the standard body 38 between 39.

In addition, the present invention is other, muddy water shield and mud pressure,
It can be applied to all types of shield machines such as sludge, air bubbles and earth pressure balance.

(Effect of the Invention) As described above, according to the present invention, a shield is provided in the front part of the shield cylinder, the face chamber is provided through this partition, and the front part of the earth removing device is connected to the face chamber. In the machine, the excavator and / or bulkhead etc. are equipped with a density / moisture measuring device for measuring the density and / or water content by using radioisotope (RI), and the earth discharging device etc. are provided with the density and / or the soil discharged. A moisture measuring device and a device for measuring the amount of soil discharged from the soil discharging device are provided, and the density / moisture measuring device holds the detection capsule in a telescopic manner with the jack. It is possible to directly measure the soil quality of the face, the face chamber and the ground, and the entire excavated section can be measured, and the amount of soil excavated by the shield and the amount of additive injection can be measured. While matching the amount of soil removed, It is possible to through the solid earth unloading amount management That excavation management, there is an advantage that it is possible to minimize the subsidence of the ground surface and the ground.

A density / moisture measuring instrument was installed on the partition wall, and when the excavator was stopped, it was pushed into the face chamber by a jack, etc., and the body was pressed against the ground to measure the soil quality. Is also applicable.

Alternatively, for the density / moisture analyzer, it was decided to incorporate a radioisotope (RI) source into the cutter bit at the tip of the rotary drilling device, and to measure by receiving radiation with the detector at the rear, so it is deep in the ground. It can be penetrated, data of many natural grounds can be obtained, and the sediment of the face room can be measured.

In addition, the density / moisture analyzer is equipped with a radiation source inside the copy cutter incorporated in the spoke, and the copy cutter is inserted into the ground by extending the jack provided inside the spoke to detect the presence at the tip of the spoke. Since it was decided to detect the radiation with a detector, it is also advantageous when excavating the surrounding ground with a copy cutter.When the copy cutter is contracted, a standard body is provided between the radiation source and the detector for calibration. It is also possible.

[Brief description of drawings]

1 (a) and 1 (b) are a front view and a longitudinal sectional view of a shield machine showing a first embodiment of the present invention, and FIGS. 2 (a) and 2 (b) are a longitudinal sectional view of a density / moisture measuring instrument. Figures and 3 are vertical cross-sectional views of the device for taking out the density / water content measuring device into the shield. Figures 4 (a) and 4 (b) are vertical and horizontal cross-sectional views of the flow velocity measuring device. FIG. 6 is a flow chart showing an example of a method for managing excavation, FIG. 7 is a second embodiment of the present invention, FIG. 8 is a third embodiment, and FIG. 9 is a fourth embodiment. is there. 1 ... Shield machine, 2 ... Shield cylinder, 3 ... Drilling tool, 4 ... Cutting face, 5 ... Drilling earth and sand, 6 ... Cutting chamber, 7 ...
… Soil unloading, 8 …… Soil unloading device, 9 …… Spokes, 10 …… Drilling bit, 11 …… Rotary shaft, 12 …… Differential bulkhead, 13 …… Drilling tool drive motor, 14 …… Screw conveyor motor, 15 ・ ・ ・
… Segment, 16 …… Backing material, 17 …… Soil drainage pipe, 31a, 31c
...... Density / moisture measuring device, 32, 32a …… Cable, 33 …… Detecting capsule, 33-1 …… Cemented carbide bit, 34 …… Shielding box, 35
...... Ray source, 36 …… Jack, 37 …… Seal, 38 …… Standard body, 39 …… Detector, 40 …… First computing unit, 41 …… Display unit, 42 …… Second computing unit, 43a , 43a ′ …… Cable, 44
…… Shield jack, 46 …… Shield jack, 47…
… Cylinder, 48,49 …… Seal, 50 …… Stick, 51 …… Grip block, 58 …… Speed detector, 59a, 59b …… Cable, 61
…… Flow rate measuring device, 62 …… Flow velocity measuring device, 63 …… Converter, 64
…… Transmitting element, 65 …… Receiving element, 66 …… Guide, 67 ……
Moving jack, 70 …… Display, 80 …… bit, 81 …… Copy cutter, 82 …… Seal, 83 …… Jack, 85 ……
Cylinder, 86 ... Seal, R ... Radiation.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeichi Homma 1-24-24 Shinkawa, Chuo-ku, Tokyo Within Daihoken Construction Co., Ltd. (56) References JP-A-146098 (JP, A) JP-A 55-85800 (JP, A) Actually opened Sho 63-121695 (JP, U)

Claims (5)

(57) [Claims] 1. A shield machine in which a front wall of a shield cylinder is provided with a partition wall, and a cutting face chamber is provided through the partition wall, and an earth discharging device is connected to the face wall, and a radioisotope is provided on the excavator and / or the partition wall. (RI) is used to provide a density / moisture measuring device for measuring density and / or water content, and an earthmoving device or the like is provided with a device for measuring soil density and / or water, and A device for measuring the amount of discharged soil is provided, and the density / water content measuring device has a structure in which the detection capsule is held by a jack so that it can expand and contract, and the ground can be penetrated by the jack. A shield machine characterized by. 2. The density and water content of the earth and sand in the excavation part are measured by a measuring instrument using a radioisotope (RI), and the measured values and the excavation speed of the shield cylinder are input to a computing device,
While calculating the soil particle weight of the excavation part, with a measuring instrument using a radioisotope (RI) installed in the soil removal device,
Measure the density and water content of the soil removal and input this measurement value and the measurement value of the soil removal amount by the soil removal amount measuring device installed in the soil removal device etc. to the arithmetic unit to calculate the soil particle weight of the soil removal 2. The shield machine according to claim 1, further comprising a system for excavating so that the weight of soil particles per unit time of the excavated portion and the weight of soil particles discharged are the same. 3. The density / water content measuring device is provided on a partition wall,
2. The shield machine according to claim 1, wherein when the excavator is stopped, it is pushed out into the face chamber by a jack or the like and the main body is pressed against the ground to measure the soil quality. 4. The density / water content measuring device comprises a casing,
A screw conveyor provided in this casing,
A radioisotope (RI) is attached to the cutter bit that is made up of the shaft and a cutter that is provided at the tip of the shaft and that has a cutter bit, and that can penetrate into the natural ground and advance.
2. The shield machine according to claim 1, wherein said radiation source is built-in, and radiation is measured by receiving radiation at a rear detector. 5. The density / moisture measuring device, wherein a radiation source is provided in a copy cutter incorporated in a spoke, and the copy cutter is inserted into the ground by extending a jack provided in the spoke. The radiation is detected by a detector at the tip.
The listed shield machine.