JPH0718661A - Injection pressure control method in jet grout construction method and control panel thereof - Google Patents

Abstract

PURPOSE:To reduce the control load by issuing an alarm when the injection pressure is lowered to the lower limit pressure or below and the duration of the lower limit pressure of below exceeds the preset duration of the lower limit pressure or below or when the injection pressure is increased to the upper limit pressure or above and the duration of the upper limit pressure or above exceeds the preset duration of the upper limit pressure or above. CONSTITUTION:When pressure is lowered to the lower limit or below, a pressure detecting switch S2 is closed, and a timer TL starts operating. When the timer TL starts operating and the set time of a timer T1 elapses, i.e., when the set time tTL of the timer TL and the set time tT1 of the timer T1 elapse, a switch ST, is closed, and an alarm buzzer 6 is operated. When pressure exceeds the upper limit pressure, a pressure switch S3 is operated, and a timer TH starts operating. When the pressure is not lowered to the upper limit pressure or below after the set time tTH, a switch STH is closed, and the alarm buzzer 6 is operated. When the pressure is again returned to the normal value, the timer TH is reset, the switch TH is opened, and the operation of the alarm buzzer 6 is released.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection pressure control method in a jet grout method. More specifically, the injection pressure control method and its control board in the jet grout method for monitoring the pressure so that the ultra high pressure water or the ultra high pressure hardening material liquid injected into the ground by the jet grout method is surely injected. Regarding

[0002]

2. Description of the Related Art The jet grout method is a pile-shaped method in which a rotary nozzle is lowered into a hole drilled by a hole drilling machine, and super-high pressure water or a super-high pressure hardening material liquid is jetted from the rotating nozzle into the ground. It is known as a construction method for making ground improvement bodies. As the injection pressure at this time, a nozzle pressure of 200 to 400 kgf / cm ² is applied. If this pressure is too weak, the cutting ability of the ground will be insufficient and the solidified body will be defective. On the contrary, if this pressure is too strong, the solidified body will be defective due to excessive grounding. In order to avoid such a problem, the pressure is adjusted so that the injection pressure of the ultra-high pressure water falls within a certain range.

A pressure gauge is provided in a hose above the ground that connects an ultra high pressure water supply source and a nozzle. Conventionally,
The operator adjusts the injection pressure by looking into the inside through the viewing window, looking at the needle and reading the injection pressure. The construction by the jet grout method usually proceeds at multiple places at the same work site at the same time. One worker looks around multiple pressure gauges in sequence, and one worker manages multiple constructions. .

As described above, in the conventional management method in which one worker looks around a plurality of pressure gauges in turn, the pressure gauges are looked at between various operations, and when looking around, it is normal but other than that. I don't know what's going on in the hour.

[0005]

The present invention has been invented in the above technical background, and achieves the following objects.

The object of the present invention is to constantly inform the worker whether or not the injection pressure is within the allowable range, and to issue a warning when the injection pressure is out of the allowable range for a certain period of time to call attention. An object of the present invention is to provide an injection pressure management method for a jet grout that reduces the management burden on the operator.

[0007]

The present invention adopts the following means in order to achieve the above object.

The injection pressure control method in the jet grout method of the present invention is an injection pressure control method in the jet grout method in which an alarm is issued when the pressure is lower than the lower limit pressure and higher than the upper limit pressure. Elapsed from the time when the pressure or less duration is less than or equal to the lower limit pressure When the set time has elapsed, or when the injection pressure rises above the upper limit pressure and the duration above the upper limit pressure is above the upper limit pressure The feature is that an alarm is issued when the set time has elapsed.

Further, the injection pressure management method in the jet grout method of the present invention is characterized in that, in the above invention, the light emitting lamp is turned on when the injection pressure is between the lower limit pressure and the upper limit pressure.

Furthermore, the injection pressure control board in the jet grout method of the present invention has passed the set time elapsed from the time when the injection pressure drops below the lower limit pressure and the duration below the lower limit pressure falls below the lower limit pressure. Jet grout used for the injection pressure control method in the jet grout method that issues an alarm when the set time elapses from the time when the injection pressure rises above the upper limit pressure and stays above the upper limit pressure for more than the upper limit pressure. An injection pressure management board in the construction method, which is a management board body (2), and a supply side connection port (3) provided in the management board body (2) for connecting a supply source side hose and a nozzle side hose, respectively. Nozzle side connection port (4) is provided in a fluid pipe connecting the supply side connection port (3) and the nozzle side connection port (4) therein, and the lower limit pressure and the above Pressure detection switch for detecting the limit pressure (ST _L, ST _H) and the management board main body (2)
Is provided in the pressure detection switch (ST _L , ST _H )
It is characterized in that it comprises an alarm device (6) which issues the above-mentioned alarm in conjunction with the above, and a wheel (10) for causing the control panel body (2) to travel.

[0011]

The method for controlling the injection pressure in the jet grout of the present invention is such that when the injection pressure is reduced to the lower limit pressure or less and the duration of the lower limit pressure or less is equal to or less than the lower limit pressure, the injection pressure is exceeded. Rises above the upper limit pressure and continues for a period of time above the upper limit pressure above the upper limit pressure An alarm is issued when the set time has elapsed.

Further, in the injection pressure management method for the jet grout of the present invention, the rotary light-emitting lamp is turned on when the alarm is issued and the injection pressure is between the lower limit pressure and the upper limit pressure. Therefore, the alarm may not be issued even if the rotary light emitting lamp is not turned on.

The injection pressure control board in the jet grout method of the present invention can be easily transported to an appropriate site on the construction site, for example, the site closest to the nozzle. Such a control panel contains all the equipment necessary for alarm generation.

[0014]

【Example】

[Embodiment 1] Next, an embodiment of the present invention will be described. Figure 1,
2, FIG. 3, and FIG. 4 show an injection pressure control board for carrying out the injection pressure control method in the jet grout of the present invention, and are a front view, a right side view, a rear view, and a left side view, respectively. The pedestal 1 is placed directly on the ground. The management board body 2 is firmly fixed on the base leg 1. High-pressure bushings 3 and 4 are provided on both sides of the control panel body 2, respectively. The high-pressure bushing 3 is connected to a hose of the ultra-high-pressure water supply source. The high pressure bushing 3 serves as a connection port to which the supply side hose is connected. The high-pressure bushing 4 serves as a connection port to which a nozzle-side hose of ultra-high-pressure water is connected. A peep window 5 is provided in front of the control panel body 2, and the peep window 5 is made of glass.

An alarm buzzer 6 as an alarm device is provided on the left side surface.
Is provided. A rotary light-emitting lamp 9 is provided which is exposed on the ceiling surface of the control panel body 2 for warning and monitoring purposes. Two wheels 10 are attached to the back surface of the base 1 via bearings 11. This wheel 10 is floating above the ground. A steering handle 12 is attached to the upper portion of the back surface of the base leg 1.

A pressure gauge 13 is provided in a fluid pipe (not shown) connecting the high pressure bushing 3 and the high pressure bushing 4 in the control panel body 2. The needle of the pressure gauge 13 can be seen through the observation window 5. The pressure gauge 13 includes pressure detection switches S ₁ , S ₂ and S ₃ which will be described later, and also has a function of converting a pressure value into an electric signal and outputting the electric signal. Further, the recording output terminal for continuously recording the pressure fluctuation is provided.

Next, the structure of the alarm generation circuit of the present invention will be described. FIG. 5 shows a timer operation circuit 20 that operates in conjunction with the pressure detection switch. FIG. 6 shows an alarm generation circuit in which each switch that operates when the timer of the timer operation circuit 20 expires is incorporated. As shown in FIG. 5, pressure detection switches S ₁ , S ₂ , and S ₃ that operate at three levels of set pressure during a constant voltage E, respectively.
Is provided. The pressure detection switch S ₁ operates at an injection pressure of 100 kgf / cm ² or higher to close it, and the pressure detection switch S ₂ operates at an injection pressure of 180 kgf / cm ² or higher to open it. The switch S ₃ operates so that the injection pressure is 220 kgf / cm ² or more to close it.

Between the voltage E ₁ and the pressure detection switch S ₁
A relay R is provided in series with. This relay R
The switch SR described later is operated. A timer T, which will be described later, is connected in series with the pressure detection switch S ₂ between the voltages E _1.
After the operation of _0, the switch S that operates and closes after a variable set time
T ₀ and timer T _L are provided in series. This timer T _L operates a switch ST _L described later after a variable set time after the operation. Further, a timer T _H is provided in series with the pressure detection switch S ₃ between the voltages E ₁ . This timer T _H operates a switch ST _H which will be described later after a variable set time after the operation.

As shown in FIG. 6, the alarm generating circuit 21 includes a switch S operated by the timer operating circuit.
R, switch ST _L , and switch ST _H are incorporated. A timer T ₀ is provided in series with the switch SR between the constant voltage E ₂ . This timer T ₀ operates a switch ST ₀ described later. Further, the switch ST ₀ , the switch ST _L , and the timer T ₁ are provided between the voltage E _{2 in} series with the switch SR and in parallel with the timer T ₀ . The switch ST ₀ , the switch ST _L , and the timer T ₁ are connected in series in this order in the voltage drop direction. The timer T ₁ operates a switch ST ₁ described later.

Further, a manual switch S _B for alarm buzzer is provided between the voltages E ₂ . Between the voltage E2, an alarm buzzer 6 as an alarm generator is provided in series with the alarm buzzer manual switch S _B. In parallel between the alarm buzzer manual switch S _B and the alarm buzzer 6,
The switch ST _H and the switch ST ₁ are interposed.

A light emitting lamp circuit 22 is incorporated in the alarm generating circuit 21. Between the voltage E ₂ and the manual switch S _B for the alarm buzzer, the manual switch S for the light emitting lamp is connected in parallel.
_L is provided. A rotary light emitting lamp 9 is provided in series between the voltage E ₂ and the light emitting lamp manual switch S _L.
Between the light emitting lamp manual switch S _L and rotating bulbs 9, in series, normally closed operating immediately after the operation of the timer T _L normally open switch operates immediately after the operation OT _L and the timer T _H The switch CT _H is interposed.

[Operation of First Embodiment] Next, the operation of the first embodiment will be described. The steering wheel 12 is tilted down, the floating wheel 10 is grounded, the control board body 2 is pushed integrally with the base leg 1 while operating the steering wheel 12, and the base leg 1 is installed at a required point. The predetermined high pressure water hoses are connected to the high pressure bushings 3 and 4 to supply the high pressure water. Look into the viewing window 5 to check the pressure rise.

[0023] The timer _{T 0, T 1, T L} , a variable setting time of _{T H, tT 0, tT 1} , tT L, and tT _H. The injection pressure after entering normal operation is 180kg
The description will be made assuming that f / cm ² and the upper limit pressure are 220 kgf / cm ² . A power source (not shown) is turned on to start the system as shown in the flowchart of FIG. When the manual switch S _L for the light emitting lamp and the manual switch S _H for the alarm buzzer are turned on,
The light emitting lamp circuit 22 attached to the alarm generation circuit 21 is both turned on. While the pressure does not reach 100 kgf / cm ² , pressure detection switch S ₁ , pressure detection switch S ₂ ,
The pressure detection switch S ₃ does not operate. The relay R does not operate and the switch SR of the alarm generation circuit 21 is open. Therefore, the timer T ₀ does not operate and the switch ST ₀ is open.

FIG. 8 is a time chart, and the horizontal axis represents elapsed time. An example of pressure fluctuations is shown in the upper part by the vertical axis. The lower side to the timer _{T 0, T 1, T L} , ON of T _H
・ OFF, ON / OFF of switches ST ₀ , ST ₁ , ST _L , ST _H are shown. The upper part of each line shows the ON state and the lower part shows the OFF state. Since the switch ST ₀ is open, the timer T ₁ does not run. Further, since the timer T _H does not operate and the switch ST _H is open, the alarm buzzer 6 does not operate. Further, since the normally open switch OT _L and the normally closed switch CT _H do not operate and are open, the rotary light emitting lamp 9 does not emit light.

When the pressure reaches 100 kgf / cm ² , the pressure detection switch S ₁ operates, the relay R operates, the switch SR closes, and the timer T ₀ starts operating. Although the pressure detection switch S ₂ is closed, the set time t of the timer T ₀ is set.
Since the switch ST ₀ does not operate while it has not reached T ₀ , the alarm buzzer 6 does not operate as described above.

When the set time tT ₀ of the timer T ₀ is reached, the switch ST ₀ is closed in the alarm generating circuit 21, and the timer T _L starts operating as shown in FIG. When the timer T _L of the set time reaches tT _L, the switch ST _L is closed in the alarm generating circuit 21. At this point, the timer T ₁ starts operating.

[0027] If the timer T _0, T _1, T total set time of _{L (tT 0 + tT L +} tT 1) has elapsed, i.e., when the last set time of the timer T ₁ which operates has elapsed, the switch ST ₁ is ON Can be, but Figure 7
As shown in, whether the alarm buzzer operates or not depends on whether the pressure reaches 180 kgf / cm ² . If the pressure does not reach 180 kgf / cm ² , the pressure switch S2 remains closed in FIG. 5, the timers T _L and T ₁ are not changed, and the switch ST ₁ is closed in the alarm generation circuit 21. The state continues, and the alarm buzzer 6 continues to issue an alarm. Such an alarm is issued when the pressure is 100 kgf /
time to reach 180kgf / cm ² beyond the cm ² is, (t
_{T 0 + tT L + tT 1} ) exceeds the target of 180 kgf / cm ²
It takes too long to reach.

When the pressure reaches 180 kgf / cm ² while the alarm buzzer 6 is issuing an alarm, the timer T _{L is} shown in FIG.
Operation is stopped and reset, switch ST _L is opened,
The timer T ₁ is reset, the switch ST ₁ is opened,
The alarm of the alarm buzzer 6 stops. Time (tT ₀ + tT
When _L + pressure prior to the expiration of tT ₁₎ reaches 180 kgf / cm ^2, it is reset to stop the operation of the timer T _L is before the lapse of time _{(tT 0 + tT L + tT} 1), opening switch ST _L is, the timer T _{Since 1} is reset, switch S
T ₁ never closes and no alarm is issued. As shown in FIG. 7, even after even before the lapse of time _{(tT 0 + tT L + tT} 1), when the pressure reaches 180 kgf / cm ^2, the process proceeds to the next step.

When the pressure is in such a range, as described above, the timer T ₁ is reset and the switch ST ₁
Is open so no alarm is issued, but timer _TL
Is in the OFF state, and the normally open switch OT _L of the light emitting lamp circuit 22 in FIG. 6 is closed. The pressure is 220 kgf / cm ²
Since the timer T _H is not running,
The normally closed switch CT _H of the light emitting lamp circuit 22 of FIG. 6 is closed. Therefore, the light emitting lamp circuit 22 is conducted, and the rotary light emitting lamp 9 is turned on.

When the pressure drops below 180 kgf / cm ² ,
As shown in FIG. 8, the pressure detection switch S2 is closed again,
The timer T _L starts operating. While the timer T _L starts operating and the set time has not elapsed, the switch ST _{L in} FIG. 6 does not close, so the timer T ₁ does not operate.
When the set time of the timer T ₁ is passed, i.e., the timer T _L set time tT _L and timers T ₁ of the set time t
When T ₁ has elapsed, the switch ST ₁ is closed and the alarm buzzer 6 operates. If the pressure returns to 180 kgf / cm ² while the alarm buzzer 6 is operating, the alarm buzzer 6 stops.

The state pressure drops below 180 kgf / cm ² time (tT _L + tT ₁₎ or continued without pressure again 18
When returning to 0 kgf / cm ² , the alarm buzzer 6 does not operate because the timer T _L is reset. Since the normally open switch OT _L is always open while the pressure is reduced to 180 kgf / cm ² or less, the light emitting lamp circuit 22 does not conduct and the rotary light emitting lamp 9 does not light.

[0032] FIG. 8, the normal pressure conditions not exceeding 220 kgf / cm ² pressure is reached again 180 kgf / cm ² continues again,
Next, the case where the pressure exceeds 220 kgf / cm ² is shown. In the circuit of FIG. 5, the pressure switch S ₃ is activated and the timer T _H is activated. Timer T _H set time t T _H
If the pressure does not drop below 220 kgf / cm ² later, the switch ST _H is closed and the alarm buzzer 6 is activated.
When the pressure returns to the normal value again, the timer _TH is reset, the switch _TH is opened, and the operation of the alarm buzzer 6 is released.

In the above operation, the timers T ₀ , T ₁ , _TL ,
T _H set time _{tT 0, tT 1, tT L} , tT H can be arbitrarily set in a variable. For example, the set time of the timer T ₁ can be zero. In this case, timer T ₁
Use a relay instead of.

As described above, the circuits of FIGS. 5 and 7 have the following alarm functions as shown in the flow charts.

1: No alarm is issued unless the pressure reaches 100 kgf / cm ² .

2: 1 after the pressure reaches 100 kgf / cm ^2.
If it takes more than a certain time to reach 80kgf / cm ² , an alarm will be issued.

3: The duration of the state in which the pressure was reduced to 180 kgf / cm ² or less (the duration below the lower limit pressure where the injection pressure falls below the lower limit pressure and continues) is a certain time (elapses from the time when the lower limit pressure is reached. When the set time is reached, an alarm is issued.

4: The time during which the pressure has risen to 220 kgf / cm ² or more (the duration over which the injection pressure rises above the upper limit pressure and continues for the upper limit pressure or more) is constant for a certain period of time (when the upper limit pressure is reached). An alarm is issued when the set time is reached.

Further, the circuits of FIGS. 5 and 7 have the following lighting function.

[0040] 1: As long as the pressure is between the lower limit pressure 100 kgf / cm ² and the upper limit pressure 200 kgf / cm ^2, rotating bulbs 9
Emits light.

[0041] 2: Unless a pressure not between the lower limit pressure 100 kgf / cm ² and the upper limit pressure 200 kgf / cm ^2, rotating bulbs 9
Does not emit light.

Therefore, as long as the alarm is issued, the rotary light emitting lamp 9 does not emit light. No alarm is issued as long as the rotary light emitting lamp 9 emits light. Even if the rotary light emitting lamp 9 does not emit light, the alarm is not always issued. Workers can confirm the normality / abnormality of the pressure value at any time by looking at the lighting status of the rotary light emitting lamp. Even if you do not always see the lighting status of the rotary light emitting lamp,
Abnormal conditions are sounded to workers everywhere.

[Other Embodiments] The present invention is not limited to the above embodiments. For example, an alarm is transmitted by radio waves, and a worker can receive it by converting it into sound waves with a receiver. Program software can be used instead of the alarm generation circuit.

[0044]

EFFECTS OF THE INVENTION An alarm can be issued with sufficient time. It is not possible to deal with pressure abnormalities for a short time, and it is possible to deal with a margin at the discretion of the site. Therefore, the burden of supervision is reduced.

Further, the normal state can always be visually recognized. Even if you are in a place where you cannot see it or if you overlook it, you can know the abnormality by an alarm. Therefore, the burden of supervision is further reduced.

Furthermore, the control panel including the equipment necessary for alarm generation can be easily transported to the most appropriate place on the construction site.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of an injection pressure control board in a jet grout of the present invention.

FIG. 2 is a right side view of FIG.

FIG. 3 is a rear view of FIG. 1.

FIG. 4 is a left side view of FIG.

FIG. 5 is a timer operation circuit diagram.

FIG. 6 is a circuit diagram for alarm generation.

FIG. 7 is a flow chart diagram.

FIG. 8 is a time chart diagram.

[Explanation of symbols]

1 ... Stand legs 2 ... Management board body 3,4 ... High pressure bushing 5 ... Peep window 6 ... Alarm buzzer 9 ... Rotating light emitting lamp 10 ... Wheel 12 ... Handling handle 13 ... Pressure gauge 20 ... Timer operating circuit 21 ... Alarm circuit 22 ... light-emitting lamp circuits S _1, S _2, S ₃ ... pressure detection switch R ... relay _{SR, ST 0, ST 1,} ST L, ST H ... switch _{T 0, T 1, T L} , T H ... timer S _B ... manual switch for the alarm buzzer S _L ... light-emitting lamps manual switch OS _L ... normally open switch CS _H ... normally closed switch

Claims (3)

[Claims] 1. A method for controlling an injection pressure in a jet grout method for issuing an alarm when the pressure is lower than or equal to a lower limit pressure and higher than or equal to an upper limit pressure, wherein the injection pressure is reduced to a lower limit pressure or lower and a duration of the lower limit pressure or lower is reduced to a lower limit pressure or lower. When the set time that elapses from the point of time has passed, or when the set time that elapses from the time when the injection pressure rises above the upper limit pressure and the duration of more than the upper limit pressure exceeds the upper limit pressure has elapsed, an alarm is issued. The injection pressure control method in the jet grout method, which is characterized in that 2. The injection pressure management method for a jet grout method according to claim 1, wherein the light emitting lamp is turned on when the injection pressure is between the lower limit pressure and the upper limit pressure. Pressure management method. 3. The upper limit of the injection pressure is increased when the set time elapses from the time when the injection pressure falls below the lower limit pressure and stays below the lower limit pressure below the lower limit pressure. An injection pressure control board for the jet grout method used for the injection pressure control method in the jet grout method that issues an alarm when the set time that elapses after the pressure exceeds the upper limit pressure is exceeded. 2), a supply side connection port (3), a nozzle side connection port (4), which is provided in the control panel body (2) and connects a supply source side hose and a nozzle side hose, respectively, and the supply side connection port A pressure detection switch (ST _L , which is provided in a fluid pipe that connects (3) and the nozzle-side connection port (4) therein, and detects the lower limit pressure and the upper limit pressure.
ST _H ), an alarm device provided in the control panel body (2) for issuing the alarm in conjunction with the pressure detection switches (ST _L , ST _H ), and for running the control panel body (2). Wheels (10)
The injection pressure control board in the jet grout method is characterized by consisting of