JP3156050B2 - Landing judgment management method of ground improvement processing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a ground improvement treatment method in which the tip of a stirring and excavating shaft of a ground improvement treatment machine effectively reaches a "support layer" or a "non-liquefied layer". Belongs to the technical field of landing judgment management that estimates and judges by confirming some phenomena and conditions, and more specifically, under the conditions corresponding to the construction site, the soil condition of the target ground, the ground improvement processing machine (hereinafter, referred to as The present invention relates to a construction management method in which anyone can obtain the same landing determination result by automatic determination according to the capability and specifications of the processing machine.

[0002]

2. Description of the Related Art Conventionally, when implementing a ground improvement treatment method,
Those skilled in the art are equally aware of the importance of `` landing judgment '' to confirm whether the tip of the stirring and excavating shaft of the ground improvement processing machine has effectively reached the support layer or the non-liquefied layer, Basically, based on the magnitude of the current value or hydraulic pressure value of the processing machine motor (electric motor or hydraulic motor) and the penetration speed of the ground improvement processing machine, simple landing management based on vague experience and intuition It is just doing it.

[0003] For example, in the method of determining bottom contact described in Japanese Patent Application Laid-Open No. 10-102478, in the implementation of the deep mixing treatment method, each of the penetration speed, penetration time, and penetration tip depth of the processing machine in the first improvement work is improved. The measured values are collected every unit time until the end of the processing machine reaches the support layer to create a graph of the bottoming judgment standard which is graphed. The method is characterized in that each measurement value during construction is collected in real time to create a landing determination reference chart, and the construction is advanced while determining the landing based on the drawing.

[0004] Ground improvement is often carried out to a depth that is recognized as a "non-liquefied layer". However, when the depth position of the non-liquefied layer changes, the correct non-liquefied layer is required. The inability to confirm arrival is also a problem. Incidentally, the "liquefied layer" is often a sandy ground relatively under the groundwater table, and is defined as a loose layer or a non-dense layer. on the other hand,
Since the “non-liquefied layer” can be defined as a closed formation, it is considered that the distinction between a loose layer and a closed layer is possible as in the case of the support layer.

[0005]

As described above, in the conventional bottoming judgment, at most the support layer is artificially judged on the basis of the current value and the penetration speed value of the processing machine. Therefore, the criterion for judging “landing” is ambiguous, and it cannot be denied that the judgment of the execution work differs depending on the person in charge. As a result, the processor is overloaded, resulting in damage to the processor. The reason for this is that, in many cases, the current value determined as the landing is different in the shaft rotation speed and the shaft torque even if the capacity (capacity) of the electric motor of the processor is the same.
Further, the current value differs depending on the shape of the excavating cutter and the stirring blade. Therefore, the capacity of the motor of the processing machine,
It should be understood that the standard value of the landing judgment and the construction capacity vary depending on the specifications.

An object of the present invention is to automatically and automatically determine a landing based on the capacity and specifications of a processing machine according to soil conditions, and to automatically determine conditions (same criteria) corresponding to a construction site. An object of the present invention is to provide a landing determination management method in which the same result can be obtained even if the user is not an expert.

It is another object of the present invention to provide a management method that can determine the landing of the bottom layer in exactly the same manner not only for the “support layer” but also for the “non-liquefied layer”.

[0008]

According to a first aspect of the present invention, there is provided a method for managing the landing of a ground improvement machine according to the first aspect of the present invention, which is a method relating to a "support layer". Based on the drilling data where the soil composition of the site and N value data etc. are clear, a test construction of excavation and penetration is performed near the drilling data collection position, and the penetration depth, penetration speed and penetration time of the ground improvement processing machine The suspended load value of the agitated excavation shaft, the load current value of the electric motor, or the measured value of the load torque value is collected for each penetration depth until it reaches the clear support layer according to the boring data, and the estimated landing depth, the electric motor Expected landing current value or load torque value,
The estimated landing load at the bottom and the estimated landing speed at the bottom should be adopted as the judgment reference values, and the depth of penetration, penetration speed, lifting load value, load current value or load value of the electric motor for the ground improvement processing machine will be the same for the subsequent works. Measure the torque value, and enter the monitoring system for landing judgment when the penetration depth reaches the expected landing depth. (A) The measured value of the load current or load torque of the motor is the expected landing current value or load torque. (B) The measured value of the suspended load of the ground improvement processor is less than or equal to the expected landing load value, and the measured value is set. (C) The measured value of the penetration speed of the ground improvement processor is less than the estimated penetration speed at the landing, and the measured value continues up to the set judgment elapsed time or reaches the judgment penetration distance What you did Each monitor, at least the
When any one of the conditions (a) to (c) is satisfied, it is determined that the support layer has landed on the support layer.

[0009] The method for managing the determination of the landing of a ground improvement processor according to the second aspect of the present invention is a method relating to a "non-liquefied layer", wherein the soil composition and N-value data of the construction site are clarified. Based on the existing drilling data, a test construction of excavation and penetration was performed in the vicinity of the boring data collection position, and the penetration depth, penetration speed, time required for penetration of the ground improvement processor, suspended load value of the stirring excavation shaft, and load current value of the electric motor Alternatively, each measured value of the load torque value is sampled for each penetration depth until it reaches a clear non-liquefied layer according to the boring data, and the estimated landing depth, the estimated landing current of the motor or the load torque value, The estimated bottom lifting load value and the estimated bottom penetration speed shall be adopted as the judgment reference values, and the depth of penetration, penetration speed, lifting load value, and motor load current of the ground improvement processor will also be used in subsequent works. Or, measure the load torque value, and enter the monitoring system for landing judgment from the stage when the penetration depth reaches the expected landing depth, and (a) the measured value of the load current or load torque of the motor is the expected landing load current value or (B) The measured value of the suspended load of the ground improvement processor becomes less than or equal to the expected landing load value, and the measured value is set. (C) The measured value of the penetration speed of the ground improvement treatment machine is less than the expected penetration speed at the landing, and the measured value continues until the set determination elapsed time, or the judgment penetration distance Is reached, and when at least any one of the above conditions (a) to (c) is satisfied, it is determined that the non-liquefied layer has landed.

[0010] According to a third aspect of the present invention, there is provided a method of managing the landing of a ground improvement processor according to the first or second aspect,
The execution work is characterized in that it starts from a position adjacent to the test work and sequentially proceeds to a work at a remote position.

According to a fourth aspect of the present invention, there is provided the method for managing landing determination of a ground improvement processing machine according to any one of the first to third aspects, wherein a soil composition of a construction site and a boring data collection position such as N value data are collected. Depth, penetration speed, penetration required time, suspended load value of agitated mining shaft, load current value of electric motor or load torque value of electric motor obtained by test construction performed near The estimated landing depth used in the values, the estimated landing current or load torque value of the motor, the estimated landing load value, the estimated penetration speed, and the penetration depth, penetration speed, and suspension of the processing machine measured in the construction work The load value, the load current value of the electric motor, or the load torque value must be set or input to the construction management device, respectively, and enter the monitoring system for landing judgment from the stage when the penetration depth reaches the expected landing depth, and (a) Motor negative The measured value of the load current or the load torque exceeds the expected landing current value or the load torque value, and the measured value lasts until the set judgment elapsed time. (B) The measured value of the suspension load of the ground improvement processor Is less than or equal to the expected landing load value, and the measured value lasts up to the set judgment elapsed time. (C) The measured value of the penetration speed of the ground improvement processor is less than the estimated landing speed, and the measured value is Whether it lasts up to the set determination elapsed time or has reached the determination penetration distance, each is monitored, and at least one of the above (a) to (c) is satisfied if the support layer or the non-liquefied layer is satisfied. It is characterized in that it is automatically determined by comparing and examining that the bottom has been reached by the arithmetic circuit of the construction management device.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the embodiments and examples of the present invention will be described first.

In the present invention, drilling is carried out in advance at the construction site, whereby, for example, as shown in FIG.
When the data such as the landing depth (-11 m) becomes clear, a test construction for excavating and penetrating with a ground improvement processing machine is performed next to a position adjacent to the boring data sampling position (boring position). . Then, based on the boring data, the penetration depth of the treatment machine, the penetration speed, the penetration required time, the suspended load value of the stirring excavation shaft, the load current value of the electric motor or the load torque value are measured, and each measured value is Samples are collected at each penetration depth until the tip of the agitation excavation shaft of the processor reaches the support layer that is clear from the boring data, and is recorded and stored.

Based on the measurement values thus collected, as shown in Table 1 below, a load current value (ampere = A) and a load torque value (%) according to each soil condition in the processing machine, stirring, The hanging load value (ton = t), excavation penetration speed (m / minute) and penetration depth position (-m) of the excavation shaft are analyzed, and the relationship with the N value is compared.

[0015]

[Table 1] According to [Table 1], it can be seen that the soil condition is the design depth at which the excavation penetrates to the D layer. According to the processing capability shown in [Table 1], the C layer has a penetration speed of 0.3 m / min,
It could be constructed up to 11m underground. The load current value is 422A,
The load torque value was 140%. However, if the depth is -1
Immediately after reaching the layer D, which is regarded as the "support layer", exceeding 1 m, it was impossible to penetrate (penetration speed: 0.1 m / minute), the load current value was 455 A, and the load torque value was 150%. The suspension load value temporarily decreases to 18t at the boundary portion between the A layer having an N value of 35 and the B layer having an N value of 20, but reaches 22t when reaching the B layer.
Slightly recovers. And when it reached the D layer near the design depth, it decreased sharply to 5t. The duration when the hanging load was 5 t was 3 minutes or more.

Based on the above results and understanding, the "judgment reference value" is set as follows.

The estimated landing depth is about 11 m underground.

The expected landing current value of the motor is 420 A, and the load torque value is 140%.

The expected suspended load value at the bottom of the stirring excavation shaft is 5 tons or less.

[0020] The anticipated penetration speed is set to 0.3 m / min or less, and the duration is 3 minutes.

Next, Table 2 below shows the allowable use time (on-site use limit time) with respect to the load current value A of the electric motor mounted on the processor.

[0022]

[Table 2] According to [Table 2], the above current value (420 A)
It is appropriate to set the reference determination time of the target to 7 minutes, and the reference determination time of the estimated landing speed value (0.3 m / minute) to 3 minutes.

According to the above-mentioned criteria, when the depth of penetration of the agitated excavation shaft of the processing machine exceeds -11 m, it is necessary to start the landing judgment (monitoring system) (described above). At this point, the operation device of the construction management device is started.

Each of the above measured values of the construction machine in the execution work is:
Input to the construction management device. In the arithmetic circuit of the management device, comparison and examination are performed according to the flow shown in FIG. Specifically, (a) the measured value of the load current (A) or the load torque (%) of the motor exceeds the above-described estimated bottoming load current value or load torque value, and the determination elapsed time when the measured value is set. (YES or NO). (b) Whether or not the measured value of the hanging load t of the processing machine is equal to or less than the above-mentioned estimated landing load value of the landing, and whether or not the measured value continues until the set determination elapsed time. (c) Whether the measured value of the penetration speed of the processing machine is less than the estimated landing speed described above, and whether the measured value continues until the set determination elapsed time or reaches the determination penetration distance. Are monitored respectively. And at least the above (a) to (c)
If any one of the conditions is satisfied, it is automatically determined that the substrate has landed on the “support layer”.

For example, when the penetration speed becomes 0.3 m / min or less and the load current value of the electric motor exceeds 420 A (or the load torque value is 140%) for 7 minutes, it is automatically determined that "the motor has settled". I do.

The above judgment result is automatically judged by the construction management apparatus. That is, the lamp of the construction management device is turned on, and the buzzer sounds. On the monitor screen, the setting item determined to be the landing is displayed. FIG. 3 shows an example of each item screen of the landing determination. This determination result is recorded and stored in the construction management device as later-executed data, called up as necessary, and reflected in the construction result table of the ground improvement pile.

FIG. 4 shows a construction screen of the construction management apparatus for determining the landing. The monitoring start depth of the landing determination is −8.32 m, the current penetration speed is 1.0 m / min, and the current motor load current value is 165 A (load torque value is 53%). I have. The soil shape and N value of the construction ground are also shown in a graph.

Next, in the case of the invention according to the second aspect, the object of the landing determination is different from the “support layer” to the “non-liquefied layer”.
Although the reference value for the landing determination is, of course, slightly different, it can be carried out in substantially the same steps and determination processing as in the first to third aspects of the present invention.

[0029]

According to the method for determining and controlling the landing of a ground improvement processor according to the present invention, whether the object is a "support layer" or a "non-liquefied layer" According to each soil condition, it is possible to judge the landing based on the capacity and specifications of the processing machine, and by the automatic judgment of the conditions (same judgment criteria) corresponding to the construction site, no matter who is not a skilled person, However, the same determination result can be obtained. Of course, burnout of the motor of the processing machine and breakage of the drive shaft due to overload can be reliably prevented beforehand.

Further, since the result automatically determined by the arithmetic processing of the construction management device can be stored as it is as the data of the execution work, it can be called up and referred to as needed afterwards, and the landing judgment for a third party including the owner can be determined. Can be demonstrated.

The landing determination according to the present invention has a degree of freedom in which the landing can be managed with little error even when the construction is performed at a position slightly distant from the immediately preceding construction position.

[Brief description of the drawings]

FIG. 1 shows boring data of a test place.

FIG. 2 is a flowchart of a landing determination.

FIG. 3 is an example of each item screen for landing determination.

FIG. 4 is an example of a construction screen for landing determination.

[Explanation of symbols] None

Claims (4)

(57) [Claims] An excavation test is carried out in the vicinity of the drilling data sampling position based on the drilling data in which the soil composition and N value data of the construction site are clear, and the penetration depth of the ground improvement processing machine is determined. Penetration speed, penetration time, suspension load value of the stirring excavation shaft, the load current value of the electric motor or each measured value of the load torque value is collected for each penetration depth until it reaches the clear support layer by the boring data, Estimated landing depth, estimated landing current or load torque value of the motor, estimated landing load value, and estimated landing speed should be used as the criteria, respectively. Measure the penetration depth, penetration speed, suspension load value, load current value or load torque value of the motor, and when the penetration depth reaches the predicted landing depth, enter the monitoring system for landing determination, and (a) The measured load current or load torque of the machine exceeds the expected landing load current value or load torque value, and the measured value lasts until the set judgment elapsed time. (B) The lifting load of the ground improvement processing machine The measured value is less than or equal to the expected landing load value at the landing, and the measured value lasts until the set determination elapsed time. (C) The measured value of the penetration speed of the ground improvement processing machine is less than the estimated penetration speed at the landing, That the measured value lasts until the set determination elapsed time or reaches the determination penetration distance, respectively, is monitored, and at least the above (a) to the support layer when any one of the conditions (a) to (c) is satisfied A method for managing the determination of the landing of a ground improvement processor, comprising determining that the landing has been made. 2. Based on the drilling data in which the soil composition and N value data of the construction site are clear, a test construction of excavation and penetration is carried out in the vicinity of the boring data sampling position, and the penetration depth of the ground improvement processing machine, The measured values of the penetration speed, the required penetration time, the suspended load value of the stirring excavation shaft, the load current value of the electric motor, and the load torque value were collected at each penetration depth until reaching the clear non-liquefied layer according to the boring data. Therefore, the estimated landing depth, estimated landing current or load torque of the motor, estimated landing load value, and estimated landing speed should be used as the criteria, respectively. Measure the penetration depth, penetration speed, lifting load value, load current value or load torque value of the motor, and enter the monitoring system for landing judgment from the stage when the penetration depth reaches the expected landing depth. ) The measured value of the load current or the load torque of the motor exceeds the expected landing current value or the load torque value, and the measured value lasts until the set judgment elapsed time. (B) The suspended load of the ground improvement processing machine (C) the measured value of the grounding processing machine becomes less than the estimated penetration speed, Monitor that the measured value lasts up to the set determination elapsed time or reaches the determination penetration distance, respectively, and when at least any one of the above conditions (a) to (c) is satisfied, non-liquid Determining that it has landed on the chemical layer,
Landing judgment management method of ground improvement processing machine. 3. The landing judgment management of a ground improvement processing machine according to claim 1, wherein the execution work starts from a position adjacent to the test work and sequentially proceeds to a work at a remote position. Method. 4. The penetration depth, penetration speed, penetration time, suspension of agitated mining shafts of a ground improvement treatment machine obtained by a test construction carried out in the vicinity of a boring data collection position such as soil composition and N value data of a construction site. Load value, measured value of the load current value or load torque value of the motor, and the estimated landing depth used as the judgment reference value, expected landing current or load torque value of the motor, estimated landing load value of the landing, landing The expected penetration speed, and the penetration depth, penetration speed,
The lifting load value, the load current value of the motor or the load torque value is
Set or input to the construction management device respectively.From the stage when the penetration depth reaches the expected landing depth, enter the monitoring system for determination of landing, and (a) the measured value of the load current or load torque of the motor will be the expected (B) The measured value of the suspended load of the ground improvement processor becomes less than or equal to the expected landing load value, and the measured value exceeds the load current value or load torque value and lasts until the set judgment elapsed time. (C) The measured value of the penetration speed of the ground improvement processor becomes less than the estimated landing speed and the measured value continues until the set determination elapsed time or is determined. The reaching of the penetration distance is monitored respectively, and when at least any one of the above conditions (a) to (c) is satisfied, the fact that the substrate has landed on the support layer or the non-liquefied layer is calculated by the construction management device Circuit to compare and examine automatically The landing determination management method for a ground improvement processor according to any one of claims 1 to 3, wherein the determination is performed.