JPH0641947A - Automatic quality control method for chemical injection into ground and its control device - Google Patents

Abstract

PURPOSE:To accomplish the improvement and automatization of quality control by constantly measuring and recording the depth of a boring rod, and measuring and recording the various measurement values, such as combination rate, injection quantity, injecting pressure and temperature, of injection chemical correspondently to the depth of the rod. CONSTITUTION:In the case of excavating a injection hole by a boring rod 6, the outputs of a rotary encoder or the like are integrated in order to continuously comprehend the depth of the tip of the rod 6 for displaying and recording it in a computing- recording device 3. After excavation, an injection agent is injected as the rod 6 is drawn out, and the depth of a rod tip part is continuously displayed and recorded in the device 3. In the case of injecting the injection agent, the combination rate of the injection agent A to liquid B is measured and computed, and outputted to the device 3 to the depth of the rod 6. In addition, the quantity, pressure and temperature of the injection agent are measured and outputted to the device 3 to the depth of the rod 6. Thus, the injection agent having fixed quality is injected into a fixed depth range under fixed pressure, flow rate and temperature, and therefore execution accuracy can be improved, and quality control can be automatized, and moreover execution record can be left.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of controlling construction quality in a chemical solution injection work in the field of civil engineering and construction, and a chemical solution ground injection device capable of easily managing the construction quality.
An automatic quality control method for chemical liquid ground injection and a chemical liquid that accurately and reliably manage the construction quality of chemical liquid injection work by automatically recording the chemical liquid injection depth in the ground and the mixing ratio of each chemical liquid in the chemical liquid injection method The present invention relates to a ground injection management device.

[0002]

2. Description of the Related Art A typical example of a chemical injection method is a double tube rod injection method. This double tube rod injection method is used as a main material (liquid A) for each rod having a double structure.
It is a ground improvement method in which the ground is solidified by pouring a hardening agent (liquid B) into the ground while mixing it at the tip of the rod and injecting it into the ground. Here, the time (gel time) from the mixing of liquid A and liquid B to the solidification is determined mainly by the type and concentration of both materials. This gel time is an important factor that influences the ground improvement effect, and depending on the condition of the target ground, the gel time varies from a quick setting of a few seconds to a setting of several tens of minutes. The drug solution and formulation are selected.

By the way, in such chemical liquid injection work,
In order to evaluate whether or not the ground improvement effect expected at the design stage was reliably realized, what kind of chemical liquid (indicating the hardening characteristics of the chemical liquid during the actual injection construction) is evaluated mainly by gel time. However, it is important to know exactly at what point (injection depth), how much injection amount and how much injection pressure was applied.

From this point of view, conventionally, for example, a flow meter or a pressure gauge is used to continuously record the injection amount of the chemical solution into the ground in the chemical solution injection work and the discharge pressure of the chemical solution at the time of injection. I have taken measures.

[0005]

However, in the conventional construction management, it cannot be said that effective management is performed regarding which point the chemical liquid of what kind has been injected. That is, the gel time is manually measured by collecting a predetermined amount of solution A and solution B from a reservoir of the chemical solution before injection into a graduated cylinder, etc., and directly measuring the time required for solidifying after mixing both solutions. Only batch processing was performed. With such a method, human error and variations are unavoidable, and since it is difficult to increase the measurement frequency in terms of labor, it is almost impossible to know the gel time that fluctuates momentarily during injection. However, the control of the quality and composition of the injection material was insufficient.

Further, the injection depth of the chemical solution is not effectively controlled because there is no suitable means that does not hinder the construction, and the length of the boring rod immediately after excavation is measured exclusively (the boring). It was only to confirm the final measurement of the hole and the final depth of the hole, and it was insufficient for the control of chemical injection. Reliable management of construction quality is extremely important in order to prevent accidents after chemical liquid injection construction, so the gel time, injection depth, chemical liquid injection amount, and chemical discharge pressure of the above-mentioned injection materials can be calculated online. There has been a strong demand for the completion of a method and an apparatus for monitoring the quality and controlling the quality thereof.

The present invention has been made in view of this problem, and an automatic quality control method of chemical liquid ground injection and a chemical liquid ground which can continuously and reliably monitor the construction quality in the chemical liquid injection method. An object is to provide an infusion control device.

[0008]

[Means and Actions for Solving the Problems]

[Automatic quality control method for ground injection of chemical liquid according to claim 1] In this automatic quality control method, a chemical liquid having a consolidating action by inserting a rod into the ground and mixing an injection material at the tip of the rod. In the chemical solution injection method of injecting into the ground, (1) while constantly recording the depth of the rod tip portion in the state where the rod is inserted into the ground, (2)
It is characterized in that the compounding ratio of the injection material is constantly measured and recorded in correspondence with the depth of the rod tip.

The chemical liquid ground injection system which realizes the above-mentioned management method, at least the detection means for constantly detecting the depth of the rod tip portion, the measurement means for measuring the mixture ratio of the injection material, and these results are continuously measured. It is constructed with a recording means for recording in. The present invention reinforces the conventional construction management method, and accordingly, management items other than the injection depth of the rod and the mixture ratio of the injection material are appropriately managed as necessary.

[Medicine solution ground injection management device according to claim 2]
This drug solution ground injection management device is a drug solution ground injection device for injecting a drug solution having a consolidating action into the ground by inserting a rod into the ground and mixing the injection material at the tip of this rod, 3) Rod depth detecting means, (4) chemical solution measuring means, and (5) recording means are characteristically provided.
And (3) the rod depth detecting means always detects the depth of the rod tip portion inserted into the ground.

(4) The chemical liquid measuring means measures the compounding ratio, temperature, injection amount, injection pressure, etc. of each liquid of the injection material injected through the rod. Here, the mixing ratio is calculated, for example, based on the density of each injection material. As an example, the relationship between the density and the concentration is obtained in advance for each injection material, the density of each injection material is converted into the concentration based on the relational expression, and the mixture ratio is calculated based on the converted value. In addition, in this calculation, the temperature of the injection material is also an important parameter, so the mixing ratio is calculated while appropriately reflecting the temperature data.

(5) The recording means receives the measurement result of the chemical solution measuring means and the detection result of the rod depth detecting means,
These are recorded continuously. Note that the gel time of the chemical solution is affected not only by the concentration of the injecting material but also by the temperature, so temperature data is also recorded if necessary. According to this recording result, it is possible to accurately know the injection depth, the injection amount of the chemical liquid, the discharge pressure of the chemical liquid, and also the gel time of the injection material, so that the construction management of the chemical liquid injection work can be ensured. .

[0013]

The present invention will be described in more detail based on the following examples. FIG. 1 is a block diagram of a chemical liquid ground injection management device which is an embodiment of the invention of claim 2,
The present invention realizes an automatic quality control method for chemical liquid ground injection according to claim 1. This apparatus measures a flow rate and the like of a chemical liquid plant 1 for separately storing the A liquid and the B liquid, an injection pump 2 for receiving the injection material 2 liquid from the chemical liquid plant 1, and the two liquids sent from the injection pump 2. It is composed of an operation recording device 3 for displaying and recording this together with the depth of the tip of the boring rod and the like, and a boring machine 4 for performing operations such as excavating the injection hole and, after excavating, pumping the chemical solution into the ground. The injection material supplied from the chemical liquid plant 1 may be a solution type or a suspension type.

FIG. 2 shows an example of a boring machine. The boring machine 4 includes a boring machine body 5, a boring rod 6 having a double structure, and a feed hydraulic cylinder 7. It comprises a depth gauge 8 for monitoring the amount of movement of the feed hydraulic cylinder 7. Here, the feed hydraulic cylinder 7
Is provided with an upper member 9 that moves up and down, and a lower member 10 that is stationary, and a hydraulic binding device 11 is installed on the upper member 9. Further, the upper member 9 and the lower member 10 are respectively provided with depth gauge fixing portions 12a and 12b, and are connected to the depth gauge 8 at their respective locations.

FIG. 3 shows the depth gauge 8 shown in FIG. 2 in more detail. The depth gauge 8 is a so-called rack and pinion type depth gauge, and includes a rack gear 13 that moves in accordance with the vertical movement of the upper member 9, a pinion gear 14 that meshes with the rack gear 13 at the position of the lower member 10, and a pinion. It is composed of a rotary encoder (not shown) for measuring the rotation amount of the gear 14.

The boring machine 4 (see FIG. 2) is provided with an operating lever 15 for applying a hydraulic pressure for binding to the hydraulic binding device 11 and an interrupt switch 16 for detecting the operating state of the operating lever 15. It is equipped. It is necessary to move the boring rod 6 downward during excavation and to move the boring rod 6 upward during chemical injection after completion of excavation. In each case, the operation lever 15
By operating the hydraulic binding device 11 to the boring rod 6
Bind tightly to.

FIG. 4 shows the inside of the arithmetic recording device 3 shown in FIG. 1 in more detail. This arithmetic recording device 3
Are pipes 17a and 17b for receiving the liquids A and B from the chemical liquid plant 1 and leading them to the boring rod 6 of the boring machine 4, and the high-sensitivity densitometers 18a and 18b installed in the pipes 17a and 17b. Flow meters 19a, 19b,
Pressure gauges 20a and 20b, a data processing unit 21,
It is composed of a display recording unit 22. Two flow meters 19 and two pressure gauges 20 are provided, but either a or b may be omitted.

The data processing unit 21 includes a density meter 18
The temperature measurement data is obtained while receiving the measurement data from a and 18b, and the respective concentrations of the two injection liquids sequentially pressure-fed through the pipes 17a and 17b are continuously detected. Specifically, the data processing unit 21 stores in advance a calibration curve that defines the relationship between the density and the concentration for each injection material, for each chemical solution, and corrects the calibration curve based on the temperature measurement data while The concentration of the injection material in 17 is calculated. That is, the concentration of the injection material is sequentially calculated online, and this is converted into the relative compounding ratio. Here, the relative compounding ratio means a percentage with respect to a prescribed compounding value determined for each target injection material. In addition, the data processing unit 21 obtains the injection amount and the discharge pressure of the chemical liquid based on the measurement data of the flow meters 19a and 19b and the pressure gauges 20a and 20b.

The data processing unit 21 further includes a depth gauge 8 and an intermittent switch 16 provided in the boring machine 4.
Is also connected so that the depth of the tip portion of the boring rod 6 can be constantly grasped. That is, of the up and down movements of the hydraulic cylinder 7, the movement in the tightly connected state, which is directly connected to the movement amount of the boring rod 6, can be detected based on the operating state of the intermittent switch 16, so that the rotary encoder in this tightly connected state can be detected. By processing the output, the boring rod 6 during excavation and injection
It continuously grasps the depth of the tip.

The display recording unit 22 receives the data from the data processing unit 21, draws the data on the CRT screen, and continuously prints and records the data on the printer and the chart paper. Specifically, it displays a time-dependent change in the depth of the tip of the boring rod, a time-dependent change in the relative mixing ratios of liquid A and liquid B, a time-dependent change in the discharge pressure of the chemical liquid, and a temperature change in the chemical liquid. Output to. The reason why the temperature and concentration of the chemical solution are displayed and recorded together is that the gel time is affected by the temperature of the injection material as well as the concentration thereof.

The operation of the chemical liquid ground injection device having the above-described configuration until the time transition such as the depth of the boring rod tip portion and the mixing ratio of the chemical liquid is recorded will be described again below. [During Excavation] The injection hole is excavated by the boring rod 6 while appropriately operating the operation lever 16. At this time,
The data processing unit 21 continuously accumulates the outputs of the rotary encoders in the state where the boring rod 6 is tightly connected to continuously grasp the depth of the rod tip portion. Then, this result is continuously displayed and recorded on the display and recording device by the display recording unit 22. Since the chemical solution is not injected during excavation, the mixing rate of the chemical solution will be recorded accordingly.

[Injection] When the excavation of the injection hole is completed as described above, next, the boring rod 6 is pulled out and the chemical liquid is injected. The movement of the hydraulic cylinder 7 with the boring rod 6 tightly connected can be grasped from the outputs of the intermittent switch 16 and the rotary encoder. Therefore, the data processing unit 21 sequentially calculates the depth of the rod tip portion, and the display recording unit. 22 continuously displays and records the result.

In this state, since the chemical solution is injected into the ground, the data processing unit 21 includes the density meters 18a and 18b.
The relative mixing ratio of the liquid A and the liquid B is calculated based on the measurement result of 1 and the result is output to the display recording device according to the depth of the rod tip. Further, the amount and pressure of the chemical liquid supplied to the boring rod 6 are calculated based on the measurement results of the flow meter 19 and the pressure gauge 20, and are also recorded.

FIG. 5 shows an example of a record obtained by continuously measuring the compounding ratio and the injection depth of the two injection materials for the actual chemical injection work. It can be seen at a glance that the standard value is being satisfied and that the injection depth is increasing step by step in equal depths, and that construction is being performed in the depth direction while adhering to the prescribed steps. .

[0025]

As described above, according to the automatic quality control method according to the first aspect, the compounding ratio and the injection depth of the injection material, which cannot be achieved by the conventional technique, are continuously and automatically measured. Since this is recorded together with the measurement results of the flow meter and pressure gauge, the construction management can be perfected. That is,
The injection material of "predetermined quality" is in the range of "predetermined depth",
Under the "predetermined pressure", it is recorded that the injection is performed at the "predetermined flow rate", and this can be confirmed at any time, so comprehensive and accurate automatic quality control of chemical liquid ground injection construction is realized. It

Further, according to the chemical liquid ground injection management device of the second aspect, it is possible to easily realize the highly accurate quality control described above.

[Brief description of drawings]

FIG. 1 is a diagram showing the configuration of a chemical liquid ground injection management device according to an embodiment of the present invention.

2 is a detailed view of the boring machine, which is a part of FIG. 1. FIG.

FIG. 3 is a view showing a part of a depth gauge installed in a boring machine.

FIG. 4 illustrates an internal configuration of the arithmetic recording device shown in FIG.

FIG. 5 illustrates an example of a recording output from the arithmetic recording device shown in FIG.

[Explanation of symbols]

1 Chemical Solution Plant 2 Injection Pump 3 Calculation Recording Device (Chemical Solution Measuring Means, Display Recording Means) 4 Boring Machine 6 Double Pipe Rod 8 Depth Meter (Rod Tip Depth Detecting Means)

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hidenori Anbo 1-3-1 Uchisaiwaicho, Chiyoda-ku, Tokyo Within Tokyo Electric Power Company (72) Yoshinobu Kaneko 2-2-11-1 Shonai-cho, Toyonaka City, Osaka Prefecture Soil and Rock Engineering Stock Company In-house

Claims (2)

[Claims] 1. A chemical solution injecting method for injecting a chemical solution having a consolidating action into the ground by inserting the rod into the ground and mixing an injection material at the tip of the rod, wherein the rod is inserted into the ground. While constantly recording the depth of the rod tip in the state, the mixture ratio of the injectable material is constantly measured, and this is measured along with the measured values such as the injection amount, the injection pressure, and the chemical temperature, and the rod tip An automatic quality control method for chemical liquid ground injection characterized by recording according to the depth. 2. A chemical liquid ground injection device for inserting a rod into the ground and mixing the injection material at the tip of the rod to inject the chemical liquid having a consolidation action into the ground, which is inserted into the ground. A rod depth detecting means for always detecting the depth of the rod tip portion, and a chemical solution measuring means for measuring the compounding ratio of each liquid of the injecting material injected through the rod, the temperature, the injection amount, the injection pressure and the like. A chemical liquid ground injection management device comprising: a recording unit that continuously records the measurement result of the chemical liquid measuring unit and the detection result of the rod depth detecting unit.