JP3145308B2 - Physical quantity measuring device, excavated soil volume measuring device including the same, and excavated soil volume measuring method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a physical quantity measuring device, an excavated soil volume measuring device including the same, and an excavated soil volume measuring method.

[0002]

2. Description of the Related Art In an earth pressure shield machine, earth and sand excavated from the ground are pumped toward ground equipment through, for example, an extraction pipe. At this time, it is important to accurately measure the amount of excavated soil from the ground and control the excavating speed of the shield machine. If the excavation amount is too large, collapse of the ground near the face, land subsidence, partial collapse of the ground, and the like are caused. If the excavation amount is too small, the ground surface in front of the face is raised.

However, in the conventional measuring technique, there is no technique for accurately measuring the excavated soil amount of the face from the earth and sand conveyed to the pipeline. In particular, in the shield method, since the earth (sand volume in the compacted state) of the face that is actually excavated is loosened, there is a large density difference between the earth and sand transported in the pipeline. There is a problem that it is difficult to accurately measure the excavated soil volume.

A method of arranging an electromagnetic flow meter or the like in a pipeline through which soil is pumped to measure the flow rate and calculating the amount of the pumped earth and sand is conceivable. However, the measurement equipment is expensive, the electrodes are easily worn, the lining cost is high, and errors are likely to occur in the case of low conductivity soil with low moisture content. There were problems such as generation of noise. In this case, inconvenience also occurs when the flow velocity is measured before the flow rate is calculated.

Further, in the prior art, there is no method for measuring the physical quantities of the earth and sand conveyed in the pipeline, such as the flow velocity, the flow rate, and the density, in real time.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the above-described technology, and an object of the present invention is to provide a relatively inexpensive and simple configuration with a physical quantity in a pipeline such as a flow rate. It is an object of the present invention to provide a physical quantity measuring device capable of accurately and in real time measuring the physical quantity.

Another object of the present invention is to provide a method for excavating soil in a ground even if a large density difference occurs between earth and sand conveyed in a pipeline and earth and sand of a face to be actually excavated. Is to provide an excavated soil amount measuring device and an excavated soil amount measuring method capable of accurately and in real time measuring the amount of excavated soil that is pumped into a pipeline.

[0008]

According to a first aspect of the present invention, there is provided a physical quantity measuring apparatus for measuring a physical quantity of a body to be pressure-fed into a hollow cylindrical pipe,
A projecting portion projecting into the pipeline in a direction intersecting with the axis of the pipeline, and a projecting portion disposed on the projecting portion, the projecting portion resulting from the flow of the pressure-feeding body in the pipeline. A first distortion detection unit that detects a first distortion caused by bending deformation;
Based on at least the first distortion, and a physical quantity calculation means for calculating the physical quantity of the object to be pumping member, said physical quantity
The calculating means includes at least the first distortion and a known or
Based on the measured density of the pressed body,
It is characterized by including a flow velocity calculating means for calculating the flow velocity of the transmitter . The invention according to claim 2 provides a hollow cylindrical pipe line.
Quantity measurement to measure the physical quantity of the object to be pumped into the inside
An apparatus, wherein the pipeline is oriented in a direction intersecting an axis of the pipeline.
A projection protruded into the projection, and disposed on the projection,
Of the protruding portion caused by the flow of the pressed body in the pipeline.
A first method for detecting a first distortion caused by bending deformation
A distortion detector, based on at least the first distortion,
Physical quantity calculating means for calculating a physical quantity of the pressure-receiving body.
The physical quantity calculating means may include at least the first distortion
And the known or measured density of the pumped object
A flow rate calculating means for calculating a flow rate of the pressure-feeding object.
It is characterized by the following.

According to the first or second aspect of the present invention, when the pressure-feeding object is pressure-fed in the pipeline, the projection is distorted in accordance with the pressure, but the first distortion is provided on the projection. Since the physical quantity can be calculated based on the first distortion detected by the detecting section, the apparatus can be made relatively inexpensive, small-scale and simple, and the cost can be reduced.

[0010]

[0011]

[0014] According to the invention, when the conduit to be pumped body is pumped, but the protruding portion is distorted in response to this, which was detected by the first strain detecting portion disposed to the protrusion Since the flow velocity or the flow rate can be calculated based on the first distortion, the apparatus can be made relatively inexpensive, small-scale and simple, and the cost can be reduced.

Here, the flow velocity or the flow rate is determined by the strain. The drag D acting on the projection is defined as follows: S is the surface area of the projection, v is the flow velocity of the pressure-receiving body, ρ is the density, and C is the drag coefficient.

(Equation 1) Since the distortion of the protrusion is τ 突起 D, using the coefficient K

(Equation 2) When the cross-sectional area of the pipeline is A, the flow rate Q
= Av. In order to calculate the flow velocity or flow rate of the pressure-conveyed object from the strain, it is necessary to know the density of the pressure-conveyed object. However, it is assumed that the density is known, and the calculation obtained by multiplying the data by the flow velocity is performed. The flow rate is calculated based on the result.

In addition, when calculating the flow velocity or the flow rate, for example, if a plurality of protrusions are provided at local positions in the circumferential direction of the pipeline,
It is possible to calculate an accurate flow rate even if a gap or the like occurs in the pipeline. If a microcomputer or the like is used as the flow velocity or flow rate calculation means, the flow rate can be calculated accurately and in real time.

According to a third aspect of the present invention, in the physical quantity measuring apparatus according to the second aspect , the physical quantity calculating means detects a second distortion caused by bending deformation of the pipe itself. A strain detecting unit, based on the second strain, and a density calculating unit configured to calculate a density of the pressed body,
The method is characterized in that a flow rate of the pressure-feeding object is calculated based on the first distortion and the density.

According to the third aspect of the present invention, since the density is calculated based on the second distortion, the density can be measured at a lower cost than when the density is measured by, for example, a γ-ray density meter. And an inexpensive configuration.

Here, the density is determined by the second strain because the second strain is ε, the inner diameter and outer shape of the pipe are d ₁ and d ₂ , the cross-sectional area of the pipe is A, and the pipe is supported. When the fulcrum distance is L and the longitudinal elastic modulus is E,

(Equation 7) This is because it can be expressed by

According to a fourth aspect of the present invention, there is provided the physical quantity measuring device according to any one of the first to third aspects, further comprising an outer cylinder that covers an outer periphery of the first distortion detecting section and the projection. And

According to the fourth aspect of the present invention, when the pressure-feeding object is pressure-fed in the pipe, the pressure-feeding body comes into contact with the first distortion detecting portion disposed on the projection to break. However, by forming an outer cylinder that covers the protrusion and the first distortion detection unit, the first distortion detection unit can be protected. Further, since the first distortion detecting section is relatively fragile, if the first distortion detecting section is broken, the first cylinder can be easily replaced by removing the outer cylinder.

According to a fifth aspect of the present invention, in the physical quantity measuring apparatus according to any one of the first to third aspects, the protrusion is formed in a hollow cylindrical shape, and the first distortion is formed on an inner peripheral surface of the protrusion. A detection unit is provided.

According to the fifth aspect of the present invention, the first distortion detecting section can be protected from the pressure-feeding body without forming an outer cylinder.

According to a sixth aspect of the present invention, there is provided an excavated soil amount measuring device, wherein the excavated soil amount of the excavated ground is pumped into a pipeline.
An excavated soil volume measuring device for measuring the excavated soil volume from a flow rate of a body to be conveyed including an injection material injected at the time and an excavated soil to be pumped, wherein the pipe is measured from an inner peripheral surface of the pipeline. A first strain which is provided on a protrusion projecting in a direction intersecting the axis of the road and detects a first strain caused by a bending deformation of the protrusion caused by a flow of the pressure-receiving body; A detecting unit, a density calculating unit configured to calculate a density of the pressure-conveyed object to be pressure-fed into the pipeline, and the pressure-conveyed object based on at least the first distortion and a density of the pressure-conveyed object. Flow rate calculating means for calculating the flow rate of the excavated soil, at least based on the flow rate of the body to be pressed, and excavated soil amount calculating means for calculating the excavated soil amount, the excavated soil amount calculating means, at least the density Based on the density of the calculating means and the ground density of the face measured in advance, A first calculating means for correcting the flow rate of the pumping body into the ground conversion; and at least a ground conversion of the injection flow rate of the injection material based on at least the previously measured injection density of the injection material and the ground density. Second calculating means for correcting;
A third calculating means for subtracting the second calculation result from the calculation result of the first calculating means; and a flow rate of the soil calculated by the third calculating means, wherein the discharging is performed by pressure feeding. And calculating the excavated soil amount by integrating over the pumping time.
And a calculating means.

According to the sixth aspect of the present invention, even if an error due to a large density difference occurs between the body to be pressure-fed into the pipeline and the excavated soil of the face to be actually excavated, The value of the excavated soil amount can be accurately measured by the excavated soil amount calculating means, and the measurement error can be reduced.

In addition, it is necessary to measure the flow rate, density, etc., before calculating the amount of excavated soil. However, since the flow rate can be easily obtained by, for example, distortion, the configuration of the measuring device itself should be relatively inexpensive and simplified. Can be. In addition, this apparatus is mainly used for measuring the amount of soil excavated in the shield method, but can also be used as an excavated earth volume measuring apparatus for transporting general earth and sand.

According to a seventh aspect of the present invention, in the excavated soil volume measuring apparatus according to the sixth aspect , the density calculation means detects a second distortion caused by bending deformation of the pipeline itself. 2 is provided, wherein the density of the pressed body is calculated based on the second distortion.

According to the seventh aspect of the present invention, if the second distortion detecting section is employed as the density calculating means, it is relatively inexpensive and simple as compared with, for example, the one employing a γ-ray density meter. It can be configured, cost can be reduced, and handling can be simplified.

The excavated soil volume measuring method according to the invention of claim 8, pumping the excavated soil volume of excavated natural ground in conduit,
An excavated soil volume measuring method for measuring the excavated soil volume from a flow rate of a body to be conveyed including an injection material injected at that time and an excavated soil to be pumped, wherein the pipe is measured from an inner peripheral surface of the pipeline. A strain detecting step for detecting a strain caused by a bending deformation of the protrusion caused by the flow of the earth discharging, the strain detecting step being provided on a protrusion protruding in a direction intersecting the axis of the road; A flow rate calculating step of calculating a flow rate of the pressed body based on the strain and a density of the pressed body; and excavation calculating the excavated soil amount based on at least the calculated flow rate of the pressed body. Soil volume calculating step, wherein the excavated soil volume calculating step includes, based on at least the density of the body to be pressed and the ground density of the face measured in advance, reducing the flow rate of the body to be pressed. A first step of correcting the peak conversion, and at least the injected material previously measured A second step of correcting the injection flow rate of the injection material into ground conversion based on the injection density and the ground density, and a third step of subtracting the result of the second step from the result of the first step. And a fourth step of calculating the excavated soil amount by integrating the flow rate of the discharged soil calculated in the third step over a pumping time during which the discharged soil is pumped. And

According to the eighth aspect of the present invention, it is possible to correct the amount of the body to be pressed existing in the pipeline by ground conversion, and to obtain an accurate excavated soil amount.

Conventionally, since it is assumed that the pressure-supplied body flows in a filled state in the pipeline, it is not possible to accurately measure the amount of excavated soil when a gap is generated.

[0030] In contrast, in claim 8, it is possible to calculate the exact excavated soil volume by the following method. That is, based on the density of the body to be pumped into the pipeline and the ground density of the face portion measured in advance by a boring survey or the like, the flow rate of the body to be pressed to be pumped into the pipeline is converted to ground level. Convert to flow rate. Here, the ground equivalent flow rate includes the injected material injected during the discharge of excavated earth and sand, and is injected into the discharged soil according to the density of the injected material and the previously measured ground density of the face portion. The excavated soil amount of the ground can be obtained by converting the injected amount of the injected material into the ground-converted injection amount converted into the ground, and subtracting the ground-converted injection amount from the ground-converted flow rate. By further integrating this subtracted value over time, an integrated value of the soil discharge amount converted into ground can be obtained, and the obtained value can be used as a suitable excavation index for shield excavation.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an example of a preferred embodiment of the present invention will be specifically described with reference to the drawings.

1. First, a physical quantity measuring device will be described with reference to FIGS. 1 and 2 as an example of a physical quantity measuring device of the present invention, for example, a flow rate measuring device. FIG.
1 is a cross-sectional view showing a flow measurement device. 2A and 2B are views showing each part of the flow measuring device, FIG. 2A is a perspective view, and FIG.
Is an exploded front view.

As shown in FIG. 1, the flow measuring device 10
It measures the flow rate of an object to be conveyed, such as earth and sand, which is pressure-fed into the hollow cylindrical pipe 106, and includes a projection 12 projecting into the pipe 106 in a direction intersecting the axis of the pipe 106, and a projection 12.
And strain gauges 20 and 22 as first strain detectors for detecting a first strain caused by bending deformation of the protrusion 12 caused by the flow of the earth and sand in the pipe 106. An outer cylinder 3 that covers the outer periphery of the projections 12 and 22.
0, and a flow rate calculating means 70 for calculating the flow rate of the earth and sand based on at least the first strain and the known or measured density of the earth and sand.

As shown in FIG. 2B, the protrusion 12
A part is formed in a hollow cylindrical shape, and an upper screw part 14 formed on the outer peripheral surface of one end where the hollow part 18 is formed and screwed to the upper cap 40, and an outer peripheral surface of the other end not having the hollow part 18 And a lower screw portion 50 formed and screwed to the lower cap 50. The strain gauges 20 and 22 may be provided on the inner peripheral surface 19 of the hollow portion 18.

As shown in FIG.
A mounting screw 32 that is screwed to a fixing screw 34 formed on the tube wall of No. 6 is formed on the outer peripheral surface at one end. Thereby, the outer cylinder 30
The whole can be formed detachably with respect to the tube 106.

Further, as shown in FIG.
, A screw portion 42 is formed, and is screw-fixed between the inner peripheral surface of the outer cylinder 30 and the outer peripheral surface of the protrusion 12, and the screw portion 42 and the upper screw portion 14 are screwed together. Similarly, a screw portion 52 is formed on the lower cap 50, and is screw-fixed between the inner peripheral surface of the outer cylinder 30 and the outer peripheral surface of the protrusion 12, and the screw portion 52 and the lower screw portion 14 are screwed together. I do. As a result, the outer cylinder 30 is also formed detachably with respect to the protruding portion 12, and when the relatively fragile strain gauge 20 is damaged, the outer cylinder 30 can be taken out and replaced easily. From the upper cap 40, a lead wire 60 connected to the strain gauge 20 protrudes from the hollow portion 18 and is connected to the flow rate calculating means 70 to transmit a strain detection signal when a strain occurs.

A strain gauge 20 as a first strain detector
Reference numeral 22 is for detecting distortion of the projection 12, and a plurality of 22 are provided on the outer peripheral surface of the projection 12. Here, when the strain gauge 20 bends as shown by a two-dot chain line in FIG. 1, the strain gauge 22 measures the strain on the contraction side of the protrusion 12, and conversely, the strain gauge 22 measures the strain on the extension side. Therefore, it is preferable to take these average values as the measured values, but any one of them may be used. In addition, strain gauge 20
A temperature compensating gauge (not shown) for waterproofing and canceling expansion due to temperature is also provided in 22. Each of the strain gauges 20 is connected to a personal computer for analysis via a strain amplifier, and the generated strain is amplified and A / D converted and processed in real time by a personal computer or the like.

Accordingly, if there is a flow of earth and sand in the pipe 106, the outer cylinder 30 is distorted in accordance with the flow velocity, and this is measured by the strain gauges 20 and 22 of the projection 12, and the flow rate is measured with a simple configuration. it can.

Next, the reason why the flow rate can be calculated by the strain gauges 20 and 22 will be described.

In FIG. 1, the drag D acting on the protrusion 12 or the outer cylinder 30 in the flow at a uniform velocity v is S, the surface area of the protrusion 12 or the outer cylinder 30 is ρ, the density of sediment is ρ, and the drag coefficient C is C. Then

## EQU1 ## On the other hand, the distortion τ at the protrusion 12 and the drag D
Is τ∝D, and the coefficient is K,

The flow rate Q is given by
= Av. Note that the coefficient K is obtained from the amount of distortion that occurs when the density and the flow velocity are known in advance. These are performed for each soil type, a coefficient K suitable for each soil type is obtained, and the coefficient K is converted to a value suitable for the soil type according to a change in the soil type.

The flow rate calculating means 70 calculates the above equation (2) and Q = A
v, and at least the strain gauge 20 ·
Based on the output signal (first distortion) 22 and the density of the density calculating means for calculating the density of the discharged soil fed into the pipe 106, a function of calculating the flow rate of the earth and sand is provided.

Incidentally, even if known data is used as the density,
Measurement data may be used. When the measurement data is used, as a density calculating means for obtaining the density, for example, a γ-ray densitometer, a means calculated based on the second distortion caused by bending deformation of the tube 106 itself, or the like may be used. In this case, the area where the strain gauge is arranged on the tube 106 is supported by two support portions, and a strain gauge for bending is provided at the center thereof, the strain of the tube 106 is measured, and the strain is calculated by the density calculation unit. Is used to calculate the density by calculating the density (the details will be described later).

The flow measuring apparatus has been described above.
It is also possible to use a flow velocity measuring device. That is, since the flow rate Q is simply multiplied by the cross-sectional area A to the flow velocity v, it is needless to say that the flow rate calculating means can be easily formed by using a flow rate calculating means in which the multiplying means of the cross-sectional area A in the flow rate calculating means is omitted. . Although the flow rate measuring device has been described as an example of the physical quantity measuring device, the density can be obtained from the strain if the flow velocity is known.

2. Excavated soil volume measuring device Next, a transported soil volume measuring device including the flow rate measuring device 10 will be described with reference to FIGS. FIG. 5 is a block diagram showing the overall configuration of the transported soil amount measuring device. The apparatus of this example is used for measuring the amount of earth removal in the shield method, for example.

2-1. FIG. 3 shows a schematic structure of a shield machine for measuring an amount of earth removal by an excavated soil amount measuring device. As shown in FIG.
After the soil excavated by the cutter in the rotary pump 10 is collected by the screw conveyor 102, the rotary pump 10
4 to the pipe 106. Further, a sedimentation device 112 is interposed in the pipe 106 to increase the fluidity by injecting a muddy material or the like into the sediment from the pipe 106, and to discharge the discharged sediment into a sediment pump 110 including a piston type pump 114. , Is pressed into the tube 106. The pipe 106 is for transporting the earth and sand discharged from the earth and sand pump 112 to the ground via a shaft, and in the middle of the route, in order to measure the flow rate W of the earth and sand transported by the excavated earth mass measuring device in real time. Various measuring means such as the flow rate measuring device 10 are respectively installed.

2-2. About the outline of the measuring device As shown in FIG.
6, the excavated soil amount is measured, and the excavation is performed based on at least the flow rate and the density based on at least the flow rate / density. A personal computer (hereinafter referred to as PC) that performs various calculations such as excavated soil amount calculating means for calculating soil amount
).

The pump 114 is configured as shown in FIG. 4A, and measures a stroke by a pump stroke meter 116 and operates an operation signal (O) of the pump 114.
N / OFF) to the system 300 by a pulse signal.

The density calculating means 200 detects and calculates the density in the tube 106. For example, various configurations such as a γ-ray densitometer can be considered. As an example, the configuration shown in FIG. Can be

The apparatus shown in FIG. 4B constitutes a measuring tube 210 having the same cross-sectional area as the conveying tube 106, and a plurality of strain gauges 212 as a second strain detecting unit are arranged around the center of the measuring tube 210. 4B, according to the weight of the conveyed earth and sand, and the strain generated by the bending is measured using the strain gauge 212, and the density ρ is measured in real time. This is a configuration in which a density calculation unit calculates a density by calculating a density.

In this measuring apparatus, the measuring pipe 210 is supported at two points by a pair of supporting pedestals 214,
It is preferable that extra force is not applied to the measuring tube 106 from outside due to a large tension acting on the measuring tube 106.

In this example, the connection between the measuring tube 210 and the tube 106 is performed by the flexible joint 228 and the support frame 22.
Perform using 0 or the like. That is, the support frame 220 is configured to include a pair of connecting pipes 222 at both ends and a frame member 224 that supports between the measuring pipes 210.
Is fixed to the frame member 224 with sufficient mechanical strength by using a reinforcing rib 226, and the measuring pipe 210 is connected in series through a flexible joint 228 inside the pair of connecting pipes 222. Is done. As a result, the distance between the connecting tubes 222 is always constant, and
No force is transmitted to 10, and the externally applied force is reliably cut by the flexible joint 228. In addition, since it is configured as a unit, its handling is easy. Thereby, when the shield machine is in progress or when adjusting the telescopic pipe, it is possible to prevent the tensile force or the compressive force from being applied to the measurement pipe and causing a strain gauge measurement error.

Here, the reason why the density is obtained by the above configuration is that when the distance between the fulcrums 214 and 214 of the measuring pipe is L and the cross-sectional area of the pipe is A, the sediment weight W in the pipe is W = ρ
AL. Assuming that the sediment is evenly distributed in the pipe,
When the maximum bending moment M _max is obtained,

(Equation 3) Becomes Also, the maximum bending stress σmax is given by

(Equation 4)

(Equation 5) Since d ₁ is the inside diameter of the tube and d ₂ is the outside diameter of the tube, the strain ε at this time is as follows.

[0053]

(Equation 6) Here, E is a longitudinal elastic modulus, and in the case of carbon steel, E = 2100
It is 0 kg / mm ² .

Using Equations 3 to 6, the density ρ is

[Mathematical formula-see original document] Therefore, the PC uses the strain ε input from the strain gauge 212 as the second strain detection unit,
From Expression 7, the density ρ of the sediment in the pipe can be measured in real time.

2-3. Software Configuration Next, the software configuration of the excavated soil volume measuring device will be described. FIG. 5 is a block diagram of the excavated soil amount measuring device.

The configuration of the earth removal amount management system of this example is shown in FIG.
As shown in FIG. 2, a strain gauge 2 as a first strain detecting unit
0.22, strain gauge 21 as second strain detection unit
2, pressurized mud device 112 (the amount of pressure mud material to be injected into the conveying sand Q ₁ and its pressurized mud density [rho ₁₎ measurement only pipe part 3 and the like
40, and P for collecting these data and performing various arithmetic processing
C including a first system 300 and a second system 32
0, the first system 300 is installed in the inside trolley, the second system 320 is installed in the ground control room, and both are connected via the communication control system unit 330 which is a two-way communication system. Tied.

Each of the strain gauges 20, 22, and 212 measures a strain in accordance with the flow rate and density of the earth and sand. Each of these data is amplified by each of the strain amplifiers 360-1 and 360-2, and then amplified by each A / A. A / D at D conversion sections 304-1 to 304-2
It is converted and sampled in real time by the PC 302 of the first system 300. First system 300
Then, in addition to these data, various data such as the amount of mud injection, jack stroke, stroke drive time, etc. are sampled, various calculation processes are performed, and the discharging status is displayed on the display unit 306.
To display an image in real time and output to the printer 308.

The data sampled by the first system 300 is transferred to the second system 320 in the ground control room via the communication line between the RS converters 332-1 and 332-2 of the communication control system 330. . In the second system 320, similarly to the first system 300, various screens such as the unloading status are displayed in real time, and the display unit 32
4, a data table and various graphs can be printed out by the printer 326.

The PC 302 calculates the amount of earth removal based on each output of each A / D converter 304. This arithmetic system has the following configuration.

That is, the flow rate calculating means S10 includes a first strain detecting means S12 for detecting a first strain τ, and a flow rate calculating section S for calculating a flow rate v based on the first strain τ and the density ρ.
14 and a flow rate calculating means S for calculating a flow rate based on the flow velocity v
And 16.

The density calculating means S20 is obtained based on the second strain ε of the second strain detector for detecting the second strain ε caused by the bending deformation of the tube itself.

As shown in FIG. 6, the excavated soil amount calculating means S30 includes a first calculating means S32, a second calculating means S34, a third calculating means S36, and a fourth calculating means S38. The first calculating unit S32 has a function of correcting the flow rate to the ground level based on the density of the density calculating unit S20 and the ground density of the face previously measured. Second calculating means S
Reference numeral 34 has a function of multiplying the ratio of the injection density of the injection material to the ground density measured in advance by the injection flow rate of the injection material. The third operation means S36 has a function of subtracting the second operation result S34 from the operation result of the first operation means S32. 4th
The calculating means S38 has a function of integrating over the pumping time during which the soil is pumped based on the calculation result of the third calculating means S36.

The pumping time is determined by the earth and sand pump 1 shown in FIG.
10 is measured by detecting the drive time of the pressure pump 114, but in general, the operation of the jack of the shield machine (ON
/ OFF) and operation of the pressure pump 114 (ON / OFF)
May be measured from the operation time of the jack in order to interlock.

The calculation results are displayed on the display screens of the display units 306 and 324, and the printers 308 and 326 are displayed.
Is printed on recording paper.

3. Next, the operation of the conveyed soil amount measuring device having the above-described configuration will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 6 is a flowchart illustrating an example of an operation procedure of the excavated soil amount measuring device. FIG. 7 is an explanatory diagram of the comparison determination operation in step S42 shown in FIG.

First, the first and second strains, the flow rates of the injected material, the density, the time, the ground density, and the like are detected by the strain gauges 20, 22, 212, the mud device 112, the pump stroke meter 116, and the like. Each detection result is output to the A / D converter 30
4 after being converted into digital data by the PC 302
Is input to The PC 302 stores the input data in the internal storage unit 303.

Next, the PC 302 calculates the flow rate, the density, and the like based on each data stored in the storage unit 303, and calculates the excavated soil amount and the like. Note that various data and detection result data necessary for calculation are stored in the storage unit 303 in advance, and are appropriately extracted according to various calculations, and the PC 302 performs various calculations based on the data.

Here, this calculation process will be described. In step S10, the strain gauge 2 serving as the first strain detection unit is used.
The flow rate of the earth and sand conveyed in the pipe 106 is obtained based on the detection signal from 0.22. That is, the first distortion τ is detected by the first distortion detection unit (S12).

On the other hand, in step S20, the second strain is detected from the strain gauge 212 serving as the second strain detecting unit (S22), and the inside of the pipe 210 is calculated based on the detected data ε of the strain gauge 212 using equation (7). (S24).

Then, the flow velocity v of the sediment in the pipe is calculated based on at least the first strain τ and the density ρ of the discharged soil in the pipe (S14), and the flow rate Q ₁ is multiplied by the cross-sectional area A. It is calculated (S16).

[0071] Then, based on the flow rate Q ₁ that is at least calculated, to calculate the excavated soil volume (S30). Here, the flow rate Q is determined based on the calculated flow rate Q ₁ , the density ρ of the earth removal, and the ground density ρ _{0 of the} face stored in the storage unit 303 of the PC 302 and measured in advance by a boring survey or the like. performs calculation for converting the ₁ Hyde flow Q ₂ is a natural ground-converted value (S32). Since the converted flow rate Q ₂ is a flow rate in which a mud material or the like is mixed, it is necessary to subtract the flow rate of the mud material from Q ₂ .

Here, the PC 302 is provided with
The flow rate Q ₃ and its density [rho ₁ of the pressurized mud material was added to the sediment to be transported through the tube 106 is input from the flow rate Q ₃ of the pressurized mud material, using density [rho _1, [rho _0, performs calculation for converting the injection quantity Q ₄ is a natural ground-converted value. That is, the ratio between the injection density of the injected material and the ground density measured in advance is multiplied by the flow rate of the injected material (S34).

[0073] Then, in step S36, by subtracting the injection amount Q ₄ from earth removal rate Q _2, the true natural ground in terms flow Q ₅
Is calculated.

Based on the result of S36, integration is performed over the piston stroke driving time of the pump for pumping the soil into the pipe (S38). It should be noted that this time may also drive time of the shield jacks, integrating the natural ground conversion rate Q ₅ which is calculated time, the natural ground in terms of soil discharge amount, that performs computation for obtaining the excavated soil volume V of the natural ground.

Furthermore, in this example, the ground-converted earth removal amount V
PC302 to control the shield machine using
Is a step S44, performs a calculation of the theoretical excavating amount V ₀ which natural ground. Then, in step S42, the theoretical excavation amount V ₀ is compared with the ground excavated amount V obtained in step S38, and the determination shown in FIG. 8 is performed.

That is, the theoretical excavated soil amount V ₀ is compared with the ground-removed earth removal amount V. If the two are equal, it is determined that normal excavation has been performed, and If the ground is too large, the ground is taken in too much, and it is judged that there is a large amount of excess moat or there is a risk of face collapse. Judge that there is a risk of blockage, and control the shield machine. As described above, according to the present example, it is possible to accurately and in real time measure the excavated soil amount of the face, and to quickly perform the excavation control.

Further, each data calculated by the PC 302 is transmitted to the RS conversion section 332 of the attitude control system section 330.
The data is converted and transferred via the 1 · 332-2 and received by the PC 322 in the management room of the second system 320. This P
Also in C322, it is output by the display unit 324, the printer 326, and the like.

As described above, the present embodiment has the following effects.

(1) When the pressure-feeding object is pressure-fed in the pipeline, the projection is distorted in response to this, and this is detected by the first distortion detection unit provided on the projection, and the first distortion is detected. Since physical quantities such as flow velocity, flow rate, acceleration, volume, and the like can be calculated based on the strain, the apparatus can be made relatively inexpensive, small-scale and simple in configuration, and cost can be reduced. In addition, when calculating the flow velocity, the flow rate, and the like, for example, if a plurality of protrusions are provided at local positions in the circumferential direction of the pipeline, the accurate flow velocity, the flow rate, and the like are calculated even if a gap or the like occurs in the pipeline. It is possible.

(2) If the second distortion detecting section is employed as the density calculating means, it can be constructed relatively inexpensively and inexpensively and easily as compared with, for example, those employing a γ-ray density meter or the like, and the cost can be reduced. As well as being easy to handle.

(3) When the pressure-feeding object is pressure-fed in the pipeline, the pressure-feeding object may come into contact with the first distortion detecting portion disposed on the protrusion, and may be damaged. In addition, by forming an outer cylinder that covers the first distortion detection unit, the first distortion detection unit can be protected. Further, since the first distortion detecting section is relatively fragile, if the first distortion detecting section is broken, the first cylinder can be easily replaced by removing the outer cylinder.

(4) By disposing the first distortion detecting portion on the inner peripheral surface of the hollow cylindrical projection, it is possible to form the outer cylinder without forming the outer cylinder.
The first distortion detecting section can be protected from the pressure-feeding object.

(5) Even if an error occurs due to a large difference in density between the apparent volume of the body to be pumped, for example, earth and sand and the injection material, to be pumped into the pipeline and the amount of excavated soil of the face to be actually excavated. In addition, the value of the excavated soil amount can be accurately measured by the excavated soil amount calculating means, and the measurement error can be reduced. In addition, it is necessary to measure the flow velocity, flow rate, density, etc. in the stage before calculating the excavated soil volume. However, since the flow rate is easily obtained by, for example, distortion, the configuration of the measuring device itself can be relatively inexpensive and simplified. it can.

(6) Even when the excavated earth and sand contains, for example, air or the like, and voids or the like are generated in the pipe, the amount of soil removed in the pipe can be corrected by ground conversion. An accurate excavated soil amount can be obtained, and a measurement error can be reduced. Then, the integrated value of the soil discharge amount converted to the ground level is obtained, and the obtained value can be used as a suitable excavation index for shield excavation. In addition, since the measurement can be easily performed by using, for example, a strain gauge, the configuration of the measurement apparatus itself can be relatively inexpensively simplified.

Although the apparatus and method according to the present invention have been described in accordance with certain specific embodiments thereof, those skilled in the art will recognize that the embodiments and methods described herein may be practiced without departing from the spirit and scope of the invention. Various modifications can be made to the embodiment. For example, as a physical quantity measuring device, in addition to the flow rate measuring device, the present invention can be applied to a flow velocity measuring device, a density measuring device, and the like.

In each of the above embodiments,
Although the case of measuring the amount of excavated soil in the shield method has been described as an example, the present invention can also be used as a conveyed soil volume measurement device for conveying other general earth and sand. That is, if the purpose is to transport earth and sand, the measurement of the amount of soil transported in general building construction or the like may be performed.

Further, in this embodiment, one strain gauge as the first strain detecting unit is arranged on the peripheral wall of the pipeline. However, the present invention is not limited to this. And so on. In this case, by installing a plurality of tubes in the circumferential direction of the tube, it is possible to absorb variations in measurement.

Further, as the flow rate calculating means, various means can be adopted as necessary. For example, the flow rate of the earth discharging conveyed in the pipe may be measured using a pressure pump stroke meter.

Further, the case where only the mud material is considered as the injecting material has been described as an example. However, when other injecting materials are used, it is possible to perform the correction calculation in consideration of the injecting material to be used. Good. For example in addition to pressurized mud material, when injecting water or the like, at S34, it is sufficient to consider these things to determine the injection quantity Q _4.

[0090]

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of an embodiment of a physical quantity measuring device according to the present invention.

FIG. 2 is a diagram showing each part of the physical quantity measuring device of FIG. 1,
FIG. 2A is a perspective view, and FIG. 2B is an exploded front view of FIG.

FIG. 3 is a diagram illustrating a schematic structure of a shield machine that performs an earth removal amount measurement by the excavated soil amount measurement device according to the embodiment of the present invention;

4A is an enlarged front view of a portion Y in FIG. 3, and FIG. 4B is an enlarged plan view of a portion Z in FIG.

FIG. 5 is a block diagram showing an entire configuration of an example of an embodiment of an excavated soil amount measuring device according to the present invention.

FIG. 6 is a flowchart showing an example of an operation procedure of the excavated soil amount measuring device according to the present invention.

FIG. 7 is an explanatory diagram of a comparison determining operation in step S42 shown in FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Physical quantity measuring device 12 Projection part 20, 22 Strain gauge 30 Outer cylinder 70 Physical quantity calculation means 200 Density calculation means 212 Strain gauge

Continued on the front page (72) Inventor Mitsuo Shirai 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Junichi Shimizu 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Tsutomu Umehara 1-7-1, Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Taijiro Kawamoto 1-7-1, Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Invention Naoki Mori 1-7-1, Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Isao Sugimoto 1-7-1, Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Yoichi Wada Tokyo 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Hidetoshi Imamura 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (56) References Real Opening Sho 57-61562 ( JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) G01F 1/28 G01F 1/30

Claims (8)

(57) [Claims] 1. A physical quantity measuring device for measuring a physical quantity of a pressure-feeding object to be pressure-fed into a hollow cylindrical pipe, wherein the physical quantity measuring apparatus is protruded into the pipe in a direction crossing an axis of the pipe. A first distortion detection unit that is disposed on the projection unit and detects a first distortion caused by a bending deformation of the projection unit due to a flow of the pressure-feeding object in the pipeline; and parts, based on at least the first distortion, said and a physical quantity calculation means for calculating the physical quantity of the pumping member, said physical quantity calculating means, at least a first distortion, is known or measured Previous
Based on the density of the pressed body, the flow velocity of the pressed body is
A physical quantity measuring device comprising a flow velocity calculating means for calculating . 2. An object to be pressure-fed into a hollow cylindrical pipe.
A physical quantity measuring device for measuring a physical quantity of the pipe, which protrudes into the pipe in a direction crossing an axis of the pipe.
A projecting portion , disposed on the projecting portion, for receiving the pressure-transmitted body in the pipeline;
Generated due to bending deformation of the protrusion due to flow
A first distortion detecting unit that detects a first distortion, and at least based on at least the first distortion,
A physical quantity calculating means for calculating a physical quantity, wherein the physical quantity calculating means includes at least the first distortion and a known or measured
Based on the density of the pressed body, the flow rate of the pressed body
Physical quantity measurement characterized by including a flow rate calculating means for calculating
Setting device. 3. The physical quantity calculation unit according to claim 2 , wherein the physical quantity calculation unit detects a second distortion generated due to a bending deformation of the pipe itself, based on the second distortion. And a density calculating means for calculating a density of the pressure-supplied object, wherein the flow rate of the pressure-driven object is calculated based on the first distortion and the density. 4. The claim 1-3, the physical quantity measuring apparatus characterized by further having an outer cylinder covering the outer periphery of said first distortion detector and the protrusion. 5. The claim 1-3, wherein the protruding portion is formed in a hollow cylinder, the first distortion detector is characterized in that it is disposed on the inner peripheral surface of the protrusion portion Physical quantity measurement device. 6. The excavated soil volume of the excavated ground is pumped into a pipeline, and the excavated soil volume is determined based on the flow rate of a body to be conveyed including an injection material injected at that time and an excavated soil injected. An excavated soil volume measuring device, which is disposed on a protruding portion projecting from an inner peripheral surface of the pipeline in a direction intersecting with an axis of the pipeline, which is caused by a flow of the body to be pressed. A first distortion detection unit that detects a first distortion caused by bending deformation of the protrusion, a density calculation unit that calculates a density of the pressure-feeding object that is pressure-fed into the pipeline, A flow rate calculating means for calculating a flow rate of the pressed body based on the first distortion and a density of the pressed body; and calculating the excavated soil amount based on at least the flow rate of the pressed body. Excavated soil amount calculating means, wherein the excavated soil amount calculating means includes at least the density calculating means. A first calculating means for correcting the flow rate of the pressure-feeding body into ground based on the density of the cutting face and the ground density of the face measured in advance, at least the injection density of the injection material measured in advance When,
A second calculating means for correcting the injection flow rate of the injected material into ground based on the ground density, and a third calculating means for subtracting the second calculation result from the calculation result of the first calculating means. Calculating means, and the flow rate of the earth removal calculated by the third calculating means,
A fourth calculating means for calculating the excavated soil amount by integrating over the pumping time during which the excavated soil is pumped, the excavated soil amount measuring apparatus. 7. The apparatus according to claim 6 , wherein the density calculating unit includes a second distortion detecting unit that detects a second distortion caused by bending deformation of the conduit itself, and wherein the second distortion is detected. An excavated soil amount measuring device, wherein the density of the body to be pressed is calculated based on the following. 8. The excavated soil volume of the excavated ground is pumped into a pipeline, and the excavated soil volume is determined based on the flow rate of the body to be conveyed including the injected material injected at that time and the excavated soil injected. A method for measuring the amount of excavated soil, wherein the excavated soil amount is disposed on a protrusion protruding from an inner peripheral surface of the pipeline in a direction intersecting with an axis of the pipeline, and A strain detection step of detecting a strain caused by the bending deformation of the protrusion, at least, based on the distortion and the density of the pressed body, a flow rate calculating step of calculating a flow rate of the pressed body, At least, based on the calculated flow rate of the pressure-transmitted body,
Excavated soil amount calculating step of calculating the excavated soil amount, comprising: at least, the excavated soil amount calculating step, based on at least the density of the body to be conveyed, the ground density of the face measured in advance, A first step of correcting the flow rate of the object to be pressed into ground conversion, at least, a previously measured injection density of the injection material,
A second step of correcting the injection flow rate of the injection material based on the ground density based on the ground density; a third step of subtracting the result of the second step from the result of the first step; And a fourth step of calculating the excavated soil amount by integrating the flow rate of the excavated soil calculated in the step over a pumping time during which the excavated soil is pumped. Quantity measurement method.