CN101514552B - Sensor for detecting interlocking state of steel sheet piles - Google Patents

Abstract

A steel sheet pile interlock state detection sensor, a closed loop is formed by a diode D1 in parallel with the first resistor R1 and the second resistor R2, and the two ends of the first resistor R1 are used as two detection terminals of the sensor, one E terminal and one F terminal end. The effect of the present invention is: when steel sheet pile construction is carried out in common harsh environments such as wet soil, saline-alkali land, areas with high metal mineral content, coastal areas, and river banks, the sensor applicable to the present invention can detect two adjacent steel sheet piles at a predetermined depth. The interlocking state of the system can get more accurate measurement results, and it is not easy to be misjudged by the influence of harsh environments.

Description

Steel sheet pile interlock state detection sensor

technical field

The invention belongs to measurement and detection sensors, in particular to a detection sensor for the interlocking state of steel sheet piles. the

Background technique

For the interlocking state detection of steel sheet piles, according to the introduction of PCT/EP00/06484, filed Jul.7, 2000, there are currently three types of detectors of this kind with working principles. These three detectors have a high risk of sensor misjudgment in common harsh construction environments such as wet soil, saline-alkali land, areas with high metal minerals, coastal areas, and rivers. the

Method 1: According to the patent EP0141463, the sensor probe is installed in the interlocking device of the steel sheet pile, and the two signal lines pass through the iron pipe on the sheet pile, connect to the sensor probe and short-circuit in the probe. The two signal wires are connected to the voltage source via the connecting wire, thus forming a closed loop from the probe to the voltage source on ground. When two adjacent sheet pile interlocks are correctly interlocked at the probe installation depth, it means that the interlock on the second sheet pile has pierced into the first sheet pile interlock and cuts off said probe. This causes the closed loop to be broken. This allows verification that the two sheet piles are properly interlocked at the probe depth. Conversely, when the second sheet pile is not properly interlocked with the first sheet pile at the depth where the probe is located, the protrusion on the interlock of the second sheet pile cannot shear the probe in the interlock of the first sheet pile. Cut off, the closed circuit remains unchanged after the second sheet pile is driven in, which proves that the two sheet piles have separated at the depth where the probe is located. the

However the sensor presented in patent EP0 141 463 has serious drawbacks. For example, when two signal transmission lines are short-circuited, the detection results will always show that the probe is intact. When the second sheet pile is driven in, even if the probe is cut off, the detection result will also show that the two sheet piles are not properly interlocked. On the contrary, if the second sheet pile is driven in the final stage, and the two signal transmission lines are disconnected, it will be misjudged that the probe has been cut off. According to the above two cases, false detection results will be obtained for the sheet pile interlocking state. According to the above, it is worth emphasizing that the short circuit and open circuit of the sensor signal transmission line often occur in actual construction. The sensor according to patent EP0 141 463 has a high risk of misjudgment when measuring the interlocking state of the sheet piles. the

Method 2: According to the patent EP00/06484, the detection circuit is composed of resistors R1, R2, and R3 in combination in the sensor (as shown in Figure 1), and the resistor R3 is in the probe. When the sensor is in good condition, the ground monitoring unit measures the total resistance Ra=RL+[R1*(R2+R3)/(R1+R2+R3)] (as shown in Figure 1).

When the sensor probe is cut off, the total resistance measured by the ground monitoring unit is Rb=RL+R1 (as shown in Figure 2). the

When the wires connecting the sensor and the ground monitoring unit are short-circuited, the ground monitoring unit measures the total resistance Rc=RL (as shown in Figure 3). the

When the wire connecting the sensor and the ground monitoring unit is disconnected, the ground monitoring unit measures the total resistance Rd (as shown in Figure 4). the

When the sensor probe is cut off and short-circuited, the ground monitoring unit measures the total resistance Re=RL+[R1*R2/(R1+R2)] (as shown in Figure 5). the

However, when the probe (that is, the resistor R3) is cut off, and there is a conductive liquid (such as sea water) or conductive ore (such as iron ore) with a certain impedance around the exposed contacts A and B in the outside world. At this time, if the impedance of the external conductive medium is close to the resistance of R3 (as shown in Figure 6), the total resistance measured by the ground monitoring unit is approximately equal to Ra, that is, it is misjudged that the sensor probe is intact. It is worth emphasizing that this kind of misjudgment is prone to occur when steel sheet piles are constructed in common harsh environments such as wet soil, saline-alkali land, areas with high metal minerals, coastal areas and along rivers. the

Contents of the invention

The technical problem to be solved by the present invention is to provide a sensor for detecting interlocking state of steel sheet piles. Solve the high risk of sensor misjudgment in common harsh construction environments such as wet soil, saline-alkali land, areas with high metal minerals, coastal areas, and rivers. the

Technical scheme of the present invention is:

A steel sheet pile interlock state detection sensor, characterized in that: a diode D1 is connected in parallel with a first resistor R1 and a second resistor R2 to form a closed loop, and the two ends of the first resistor R1 are used as two detection terminals of the sensor, one E end, one F end. the

The two signal lines are respectively connected to the monitoring unit on the land from the E terminal and the F terminal in the sensor; one of the two signal lines is connected to the signal ground of the monitoring unit --- zero potential through the connection line, and the other is the signal ground. The line receives the level change signal with a period of T seconds from the signal generator in the monitoring unit via the connection line, such as the square wave signal pointed out in the manual, so that the unidirectional conductive element diode (D1) is periodically turned on and off ; So that the signal generator of the sensor circuit to the monitoring unit on the ground forms a closed loop. One type of level change signal is a square wave signal. the

Effect of the present invention is:

When steel sheet pile construction is carried out in common harsh environments such as wet soil, saline-alkali land, areas with high metal mineral content, coastal areas, and river banks, the sensor applicable to the present invention can detect the interlocking state of two adjacent steel sheet piles at a predetermined depth. More accurate measurement results can be obtained, and it is not easy to be misjudged by the influence of harsh environments. the

Description of drawings

Fig. 1 is patent EP00/06484, the detection circuit diagram that the sensor is composed of resistors R1, R2, R3 in parallel. the

Fig. 2 is a schematic diagram of the total resistance Rb=RL+R1 measured by the ground monitoring unit when the sensor probe is cut off. the

Fig. 3 is a schematic diagram of the principle of the total resistance Rc=RL measured by the above-ground monitoring unit when the wire connecting the sensor and the above-ground monitoring unit is short-circuited. the

Fig. 4 is a schematic diagram of the total resistance Rd measured by the above-ground monitoring unit when the wire connecting the sensor and the above-ground monitoring unit is disconnected. the

FIG. 5 is a schematic diagram of the total resistance Re=RL+[R1*R2/(R1+R2)] measured by the ground monitoring unit when the sensor probe is cut off and short-circuited. the

Figure 6 is a schematic diagram of the principle of a conductive liquid (such as seawater) or conductive ore (such as iron ore) with an impedance close to the resistance of R3 when the probe (that is, the resistor R3) is cut off, and there is a conductive liquid (such as seawater) or a conductive ore (such as iron ore) around the exposed contacts A and B exposed to the outside world . the

Figure 7.1 is a schematic diagram of the structure and use of the steel sheet pile interlock state detection sensor. the

Figure 7.2 is a schematic diagram of the use of the steel sheet pile interlock state detection sensor. the

Fig. 8 is a schematic diagram of the circuit principle when the sensor and the wire are in good condition. the

Fig. 9 is a schematic diagram of the principle when the probe on the sensor is cut off, that is, the diode D1 is cut off, and the two exposed contacts of H and G are not short-circuited. the

Fig. 10 is a schematic diagram of the principle when the probe on the sensor is cut off, that is, the diode D1 is cut off, and the two exposed contacts of H and G are short-circuited. the

Figure 11 is a schematic diagram of the principle of an external conductive medium with an equivalent impedance of R N when the probe on the sensor is cut off, that is, the diode D1 is cut off, and the two exposed contacts of H and G are connected to an external conductive medium with an equivalent impedance of R _N.

Fig. 12 is a schematic diagram of the principle when the two transmission wires connecting the sensor to the ground monitoring unit are short-circuited. the

Fig. 13 is a schematic diagram of the principle when the two transmission wires connecting the sensor to the ground monitoring unit are disconnected. the

In the figure: RL wire equivalent resistance, RN external conductive medium equivalent impedance, A ammeter, 1. Interlocking device of the second steel sheet pile, 2. Interlocking device of the steel sheet pile where the sensor is located, 3. Sensor, 4. Sensor Probe, 5, two wires connecting the ground monitoring unit and the sensor, 6, the ground monitoring unit, 7 inside the sensor, 8, a square wave signal generator.

Detailed ways

As shown in Figure 7.1, a steel sheet pile interlocking state detection sensor consists of a diode D1 in parallel with the first resistor R1 and the second resistor R2 to form a closed loop, and the two ends of the first resistor R1 are used as the two detection terminals of the sensor. One E end, one F end. the

The two signal lines are respectively connected to the monitoring unit on the land from the E terminal and the F terminal in the sensor; one of the two signal lines is connected to the signal ground of the monitoring unit --- zero potential through the connection line, and the other is the signal ground. The line receives a level change signal with a period of T seconds from the signal generator in the monitoring unit via the connection line, such as the square wave signal pointed out in the manual, so that the unidirectional conductive element diode (D1) is periodically turned on and off; Thus, a closed loop is formed between the circuit in the probe and the signal generator of the monitoring unit on the ground. the

As shown in Figure 7.1, the sensor probe is installed in the interlocking device of the steel sheet pile, and the diode D1 is inside the probe. The line iron pipe is connected to the monitoring unit on land. One of the two signal lines is connected to the signal ground (zero potential) of the monitoring unit via the connection line, and the other signal line receives the square wave signal with a period of T seconds from the signal generator in the monitoring unit through the connection line (but not Limited to square wave signals, level change signals are enough), the high and low levels of the signal are V1 (positive voltage) and V2 (negative voltage), and the voltage value V1=-V2, then its absolute value |V1|=|V2| . Thus, the signal generator of the monitoring unit from the probe to the ground forms a closed loop (as shown in Figure 7.1 and Figure 7.2). the

When the sensor and wires are intact, the circuit principle (as shown in Figure 8). When the voltage at point K is V1 (positive voltage), the ammeter measures the current value I ₃ .

${\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; =</span>\frac{<span\; class="notranslate">\; |</span>\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="V"\; filenames="H2008100541505E00041.png"\; state="\{\{state\}\}">V</figure-callout></span>}\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; |</span>}{\frac{{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="R"\; filenames="H2008100541505E00041.png"\; state="\{\{state\}\}">R</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; *</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="R"\; filenames="H2008100541505E00021.png"\; state="\{\{state\}\}">R</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; D.</span>}}<span\; class="notranslate">\; )</span>}{{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="R"\; filenames="H2008100541505E00041.png"\; state="\{\{state\}\}">R</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="R"\; filenames="H2008100541505E00021.png"\; state="\{\{state\}\}">R</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; D.</span>}}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}}$

In the above formula, R _D is the equivalent resistance of diode D1. When the voltage at point K is V2 (negative voltage), the diode is cut off by the reverse voltage, and the current value I ₄ is measured by the ammeter, which shows that I ₃ >I ₄ .

${\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; =</span>\frac{<span\; class="notranslate">\; |</span>\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="V"\; filenames="H2008100541505E00041.png"\; state="\{\{state\}\}">V</figure-callout></span>}\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; |</span>}{{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="R"\; filenames="H2008100541505E00041.png"\; state="\{\{state\}\}">R</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}}$

When the sensor and the wire are in good condition, the current value measured by the ammeter alternates between I ₃ and I ₄ every T/2 seconds because the square wave signal at point K has a period of T seconds.

When the probe on the sensor is cut off, that is, the diode D1 is cut off, and the two exposed contacts of H and G are not short-circuited (as shown in Figure 9), the ammeter measures the current value I ₄ .

When the probe on the sensor is cut off, that is, the diode D1 is cut off, and the two exposed contacts of H and G are short-circuited (as shown in Figure 10), the ammeter measures the current value I ₂ , and it can be seen that I ₂ >I ₃ >I ₄ .

${\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>\frac{<span\; class="notranslate">\; |</span>\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="V"\; filenames="H2008100541505E00041.png"\; state="\{\{state\}\}">V</figure-callout></span>}\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; |</span>}{\frac{{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="R"\; filenames="H2008100541505E00021.png"\; state="\{\{state\}\}">R</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}{{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="R"\; filenames="H2008100541505E00041.png"\; state="\{\{state\}\}">R</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="R"\; filenames="H2008100541505E00021.png"\; state="\{\{state\}\}">R</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}}$

When the probe on the sensor is cut off, that is, the diode D1 is cut off, and the two exposed contacts of H and G are connected to an external conductive medium with an equivalent impedance of R _N (as shown in Figure 11), the current value I _N measured by the ammeter , it can be seen that I ₂ >I _N >I ₄ .

${\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; N</span>}}<span\; class="notranslate">\; =</span>\frac{<span\; class="notranslate">\; |</span>\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="V"\; filenames="H2008100541505E00041.png"\; state="\{\{state\}\}">V</figure-callout></span>}\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; |</span>}{\frac{{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="R"\; filenames="H2008100541505E00041.png"\; state="\{\{state\}\}">R</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; *</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="R"\; filenames="H2008100541505E00021.png"\; state="\{\{state\}\}">R</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; N</span>}}<span\; class="notranslate">\; )</span>}{{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="R"\; filenames="H2008100541505E00041.png"\; state="\{\{state\}\}">R</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="R"\; filenames="H2008100541505E00021.png"\; state="\{\{state\}\}">R</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; N</span>}}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}}$

When the two transmission wires connecting the sensor and the ground monitoring unit are short-circuited (as shown in Figure 12), the ammeter measures the current value I ₁ , and it can be seen that I ₁ >I ₂ >I ₃ >I ₄ .

${\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>\frac{<span\; class="notranslate">\; |</span>\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="V"\; filenames="H2008100541505E00041.png"\; state="\{\{state\}\}">V</figure-callout></span>}\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; |</span>}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}}$

When the two transmission wires connecting the sensor and the ground monitoring unit are disconnected (as shown in Figure 13), the ammeter measures the current value I ₅ , and it can be seen that I ₁ >I ₂ >I ₃ >I ₄ >I ₅ .

I ₅ ≈0A

Set four current reference values I _a , I _b , I _c , I _d in the ground monitoring unit so that I _a >I ₁ >I _b >I ₂ >I ₃ >I _c >I ₄ >I _d >I ₅ .

When the current value measured by the ammeter is always I _X and satisfies I _a > I _X > I _b , the ground monitoring unit indicates state 1, indicating that the two transmission wires connecting the sensor and the ground monitoring unit have been short-circuited.

When the current value measured by the ammeter is always I _X and satisfies I _b >I _X >I _c , the ground monitoring unit indicates state 2, indicating that the probe on the sensor has been cut off, that is, the diode D1 has been cut off, and H, The two exposed contacts of G are short-circuited.

When the current value measured by the ammeter is always I _X and satisfies I _c > I _X > I _d , the ground monitoring unit indicates state 3, indicating that the probe on the sensor has been cut off, that is, the diode D1 has been cut off, and H, G two exposed contacts are open.

When the current value measured by the ammeter is always _IX and satisfies _Id > _IX , the ground monitoring unit indicates state 4, indicating that the two transmission wires connecting the sensor and the ground monitoring unit are disconnected.

When the current value measured by the ammeter alternates between I _X and I _Y every T/2 seconds, and satisfies I _b >I _X >I _c >I _Y >I _d , the ground monitoring unit indicates state 5, Indicates that the sensor and wires are in good condition.

When the sensor is correctly installed in the interlocking device of the steel sheet pile at a predetermined depth as shown in Figure 8, and the sensor is connected with the ground monitoring unit through a wire to form a closed loop, then the second steel sheet pile is driven into the second steel sheet pile, so that the interlocking of the second steel sheet pile The device penetrates into the interlock of the first sheet pile where the sensor is located. When the head of the second sheet pile interlocking device is driven into the depth where the sensor is located, if the ground monitoring unit indicates state 5 at this time, it means that the protruding part on the second sheet pile interlocking device cannot The probe in the interlocking device of one sheet pile is cut off, and the closed circuit remains unchanged after the second sheet pile is driven in, which proves that the two sheet piles have separated at the depth where the probe is located. If the above-ground monitoring unit indicates state 2 or state 3, it means that the interlock device on the second steel sheet pile has penetrated into the first sheet pile interlock device at the installation depth of the sensor so that the above-mentioned probe is cut off, which makes the diode D1 was cut off. This allows verification that the two sheet piles are properly interlocked at the probe depth. If the ground monitoring unit indicates state 1 or state 4, it means that the two transmission wires connecting the sensor and the ground monitoring unit have the above-mentioned faults and the status of the probe cannot be ascertained. the

When the probe on the sensor is cut off, that is, the diode D1 is cut off, and the two exposed contacts of H and G are connected to an external conductive medium with an equivalent impedance of R _N (as shown in Figure 11), the current value I _N measured by the ammeter , because I ₂ >I _N >I ₄ , so I _b >I _N >I _d , at this time the ground monitoring unit indicates state 2 or state 3, that is, the two sheet piles have been correctly interlocked at the depth where the probe is located, because I _N There will be no regular periodic changes, so it will not be misjudged as state 5 at this time, that is, the probe and the wire are intact, and the two sheet piles have separated at the depth where the probe is located.

Therefore, even when steel sheet piles are constructed in common harsh environments such as wet soil, saline-alkali land, areas with high metal minerals, coastal areas, and river banks, the sensor of the present invention can detect the interlocking state of two adjacent steel sheet piles at a predetermined depth. Obtain more accurate measurement results, and it is not easy to cut off the probe and mistakenly judge that the probe is intact.

Claims (2)

1. sensor for detecting interlocking state of steel sheet piles, it is characterized in that: form the closed-loop path by asymmetrical circuit element diode (D1) series-parallel connection first resistance (R1) and second resistance (R2), from the two ends of first resistance (R1) as two test sides of sensor, an E end, a F end; Two signal wires are held 2 monitoring means that are connected to the land by the end of the E in the sensor, F respectively; Signal ground-zero potential that is linked to monitoring means via connecting line of two signal wires, it is the T level variable signal of second that another root signal wire receives the cycle that signal generator sends in the monitoring means via connecting line, makes the conducting of asymmetrical circuit element diode (D1) generating period and ends; Thereby make the interior circuit of sensor form the closed-loop path to the signal generator of monitoring means on the ground.

2. sensor for detecting interlocking state of steel sheet piles according to claim 1 is characterized in that: a kind of of level variable signal is square-wave signal.

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