KR102050085B1 - Control method of deep cement mixing method - Google Patents

Abstract

The present invention relates to an excavation control method of the deep mixing process method, and relates to an excavation control method of the deep mixing process method that can detect whether the excavation equipment has reached the rock layer that is the support layer. To this end, under the control of the control unit, the auger is moved to the excavation position, drilled at a predetermined excavation speed, and when the target underlayer is reached, cement slurry is injected and ascending and descending by a predetermined height based on the target underlayer is repeated. The control unit is configured to inject the cement slurry while the auger is pulled up at a predetermined speed to the target upper layer based on the target lower layer, and the auger is preset depth based on the target upper layer. And controlling the control unit to perform the washing operation while drawing up and down after stirring and stirring, wherein the control unit checks whether the excavation of the auger reaches the target lower layer in the step of improving the body. Disclosure control method of the method is disclosed.

Description

Excavation control method of deep mixing process method {Control method of deep cement mixing method}

The present invention relates to an excavation control method of the deep mixing process method, and more particularly, to an excavation control method of the deep mixing process method that can detect whether or not the excavation equipment has reached the rock layer that is the support layer.

In general, the Deep Cement Mixing method injects a slurry of blast furnace cement and water into the soft ground (viscosity clay, sandy soil, organic soil) at low pressure while rotating the soft soil and slurry in the rotation of a special stirrer. By mixing and stirring, and solidifying the raw ground by hardening the cement to form a columnar pile body, which is variously applied to the foundation, drainage, and earthwork for the purpose of stabilizing the ground (hereinafter referred to as DCM method) ).

When applying this DCM method, it is important to detect whether the drilling rig has reached the target layer (or rock bed as an example). Because the more the target floor is reached, the auger motor load of the drilling equipment becomes larger, and the power transmitted from the generator of the DCM vessel cannot bear the load of the auger motor alone. Since the cement slurry is formed while stirring the cement slurry, the DCM process must detect whether the drilling rig has reached the target layer.

KR 10-1037958 (Invention name: Integrated perforated deep mixing treatment method) KR 10-1162904 (Invention: Deep mixing process for preventing scouring of soft seabed and foundation structure constructed using it) KR 10-0923336 (name of the invention: deep mixing process for high quality construction) KR 10-1317364 (name of invention: deep mixing process and equipment for strengthening surface and weakness) KR 10-1278130 (Invention: Seafloor solidification by deep floating soil recycling) KR 10-1267479 (Invention name: Solidified composition for deep mixing treatment method and deep mixing treatment method using same) KR 10-1023188 (name of invention: Real-time automatic recording paper of deep mixing process) KR 20-0192340 (Invention: Agitator used in deep mixing process for strengthening soft ground) KR 10-0820844 (Invention: Deep mixing treatment method with excellent construction quality) KR 10-2014-0119842 (Invention name: regenerative braking system for ships) KR 10-2016-0034439 (Invention name: In-ship generator driving device using energy storage system) KR 10-1718387 (Invention name: Diesel generator linked energy storage system and its linkage method)

Therefore, the present invention was created to solve the problems described above, it is possible to determine whether the drilling equipment has reached the target floor, so that the object to provide an invention to supply emergency power immediately upon reaching the target floor. have.

However, the objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

An object of the present invention described above, under the control of the control unit to move the auger to the excavation position and drilling boring at a predetermined excavation speed, when reaching the target lower layer injects cement slurry and a certain height relative to the target lower layer The control unit is controlled to inject the cement slurry while the auger is pulled up at a predetermined speed up to the target upper layer based on the target lower layer, and the auger is controlled by repeatedly raising and lowering as much as possible. The control unit includes a step of controlling the control unit to perform a washing operation while pulling up and down after stirring down to a predetermined depth on the basis of the reference, the control unit is to confirm whether the excavation of the auger has reached the target lower layer in the step of forming the improved body Excavation control method of the deep mixing process It can be achieved by the ball.

In addition, the step of forming the improved body is a step of the control unit checks whether the excavation of the auger has reached the target lower layer, and after the control unit controls to raise the auger to a predetermined height based on the target lower layer when the target lower layer is reached. Controlling the control unit to inject the cement slurry and stir down to the target lower layer, confirming whether the excavation of the auger has reached the target lower layer, and after the auger is pulled up to a predetermined height based on the target lower layer, the target lower layer The control unit is controlled to stir until the stirring, and the control step to perform the cleaning operation in parallel, and the control unit checks whether the excavation of the auger has reached the target lower layer.

In addition, the control unit controls the auger so that the excavation speed and excavation depth of the auger part for each excavation step are different from each other.

In addition, the control unit monitors the load of the auger motor unit, monitors the excavation speed of the auger unit, monitors the tension value of the traction wire unit, and the load of the auger motor unit is greater than or equal to a preset value, or the excavation speed of the auger unit And determining whether the tension of the traction wire part is less than or equal to the preset value, and if the at least two conditions are met, the controller determines that the target lower layer is reached.

In addition, the control unit controls to store the regenerative current generated in the winch motor unit that pulls the auger when the weight of the auger falls, and the control unit stores the power supplied from the generator in the energy storage unit. To control.

In addition, the control unit controls to use the power of the energy storage unit together with the generator power by controlling to supply emergency power from the energy storage unit to the auger motor unit when the auger unit reaches the target lower layer.

According to the present invention as described above, when the excavation equipment gradually reaches the target floor, the emergency power is provided in parallel with the generator power to the auger motor part to bear the increasing load of the auger motor part, so that the excavation equipment smoothly excavates the target floor. There is an effect that can be done.

In addition, according to the present invention there is an effect that can supply emergency power by storing energy in the battery of the energy storage unit using the generator power and the regenerative current in normal times.

In addition, according to the present invention, by applying the CAN communication, the communication speed is fast and strong against noise, thereby reducing the communication error rate with various equipments.

The following drawings, which are attached to this specification, illustrate one preferred embodiment of the present invention, and together with the detailed description thereof, serve to further understand the technical spirit of the present invention. It should not be construed as limited.
1 is a view showing a DCM vessel of the deep mixing treatment method according to an embodiment of the present invention,
2 is a view showing step-by-step excavation process of the drilling equipment according to an embodiment of the present invention,
3 is a view sequentially showing the first step process of FIG.
4 is a view sequentially showing a second step process of FIG.
5 is a view sequentially showing a third step process of FIG.
6 is a view sequentially showing a fourth step process of FIG.
7 is a view sequentially showing a fifth step process of FIG.
8 is a block diagram showing a configuration for storing energy in the energy storage unit according to an embodiment of the present invention.

Hereinafter, with reference to the drawings will be described a preferred embodiment of the present invention. In addition, one Example described below does not unduly limit the content of this invention described in the Claim, and the whole structure demonstrated by this Embodiment is not necessarily required as a solution of this invention. In addition, the matters obvious to those skilled in the art and the art may be omitted, and the description of the omitted elements (methods) and functions may be sufficiently referred to without departing from the spirit of the present invention.

Deep Cement Mixing method according to an embodiment of the present invention is a soft soil and slurry while injecting a slurry (slurry) mixed with blast furnace cement and water in a soft ground (viscosity clay, sandy soil, organic soil) at low pressure Is mixed and agitated by the rotation of a special stirrer, and solidification of the original ground using the hardening reaction of cement to form a columnar pile body for various purposes such as foundation, water, and earth for the purpose of stabilizing the ground. . Hereinafter, with reference to the accompanying drawings will be described in detail the excavation control method of the deep mixing treatment method.

As shown in FIG. 1, in order to apply the deep mixing treatment method, a DCM vessel 10 may be provided. The DCM vessel 10 may be provided with a winch unit 100, a traction wire unit 200, and an auger unit 300. In addition, the cement loaded in the bulk carrier (bulk barge) from the cement supplier transfers to the cement silo (Silo) of the DCM vessel 10, the DCM vessel 10 is measured by the load shell in the weighing stirrer in accordance with the design mix ratio Cement slurry is produced and stored in a reservoir for continuous construction. In the case of conveying the cement slurry, the cement slurry is transferred to the cement hose via an electromagnetic flowmeter. A cement column is formed by stirring a clay layer and a cement slurry by rotation of the stirring bit part of an auger part. When the construction is completed, draw the casing in order to move to the next construction position, check the state of the stirring bit and perform the cleaning operation.

On the other hand, the excavation control method of the deep mixing treatment method will be described sequentially with reference to the accompanying FIG. First, in order to perform the deep mixing treatment method at sea, the step of fixing the DCM vessel by the operation of the anchor winch is performed. That is, the DCM vessel 10 is moved to the excavation construction position. By operating the anchor winch to move the DCM ship forward, backward, left and right, the excavation position is fixed by matching the position of the leased line that changes in real time with the construction position of the drawing. At this time, the construction position (or excavation position), construction coordinates, design position and implementation distance difference is displayed in real time by the control unit. In this step, it means that the DCM vessel is fixed in the excavation position at depth 0 [M] shown in FIG.

Next, after checking the casing's zero point, the controller monitors the load A of the auger motor unit while injecting a small amount of water for drilling, and excavates a sand layer, a landfill layer, and an alluvial layer at a drilling speed of approximately 0.3 to 1 m / min. Excavate to support layer (target lower layer). In this case, the auger may include an auger motor part, an excavation part, a stirring bit part, a reducer, and a load cell. Under the control of the controller, the auger's excavation unit drills a hole at a preset excavation speed. This step refers to the first step of excavating from the depth 0 [M] to the depth 23 [M] shown in FIG. Depth 23 [M] is an example for explaining the present invention, the excavation depth may vary depending on the excavation environment. However, in the present invention, the depth 23 [M] will be defined as a supporting layer, that is, a target lower layer. In the first step, as shown in FIG. 3, the DCM vessel is moved to the excavation point, the excavation equipment is fixed, and the excavation equipment is excavated to the underwater penetration, drilling, and support layers sequentially.

On the other hand, the control unit determines whether the excavation reaches the support layer (target lower layer) in step 1 in the following manner (seabed rock bed detection function). That is, the control unit monitors whether the load of the auger motor unit is greater than or equal to the preset value (for example, confirms that a load of approximately 200 [A] or more is applied), and the excavation speed (or penetration speed) of the excavation unit is less than or equal to the preset value (as an example Approximately 0.1 M / MIN) and monitor whether the tension of the traction wire portion is less than or equal to a preset value (this may be determined by the load cell value of the auger portion or the linear velocity of the traction wire). At this time, the control unit may monitor the number of revolutions (encoder) of the cylinder in which the traction wire is wound in addition to the tension value. The traction wire part 200 is connected to the winch motor part 110 and the auger part 300 of the winch part as shown in FIG. 1. Therefore, if the excavation portion of the auger continues to excavate under the ground, the tension (or the number of revolutions of the tub wound with the towing wire) is maintained above a certain level, and the excavation speed is slowed when the support layer (the target lower layer or the rock layer) is reached. The tension (or rotational speed) of the traction wire part 200 is dropped below a preset value. The tension value is monitored by the control unit. In this case, the controller determines that the support layer (target lower layer) has been reached when at least two or more of the three conditions are met. However, the controller may determine that the excavation part excavates to the support layer (target lower layer) when one of the three conditions or all three conditions are satisfied according to the excavation environment. The control unit of the present invention is connected to all the equipment necessary for the excavation provided in the DCM vessel and CAN communication network can monitor and control the current state of the various excavation equipment in real time.

Meanwhile, the excavation part is towed by the traction wire part 200, and the traction wire part 200 is connected to the winch motor part 110. At this time, when the excavation portion descends due to its own weight, a regenerative current is generated in the winch motor unit 110. Accordingly, the controller controls the regenerative current generated by the winch motor unit 110 to be stored in the energy storage system as shown in FIG. 8. The control unit detects whether the excavation part is lowered by its own weight or monitors the sensor unit detecting the regenerative current to control the regenerative current to be stored in the energy storage unit. That is, the control unit determines whether the excavation part is lowered by its own weight based on whether the tension of the traction wire part maintains a preset value (which can be determined by the value of the load cell provided in the auger part), and the regenerative current sensing sensor part When the sensor value exceeds the preset value, it is determined that the regenerative current is generated in the winch motor unit. Therefore, when the tension of the traction wire portion maintains a predetermined value, the control unit determines that the regenerative current is generated while the excavation portion is lowered by its own weight. The control unit controls to store the generated regenerative current in the energy storage unit. In this case, the controller may further include a primary storage unit that primarily stores the regenerative current. That is, the energy storage unit includes a battery unit. When the regenerative current is stored (or charged) whenever the regenerative current is generated, the life of the battery unit may be shortened, so the regenerative current is first stored in the primary storage unit. When it is determined that the power stored in the secondary storage unit exceeds a preset value, the controller controls the primary storage unit to charge the battery unit of the energy storage unit. In this case, the primary storage unit may be embodied as a large capacity capacitor.

In addition, the control unit controls to charge the battery of the energy storage unit whenever necessary from the generator (G) provided in the DCM vessel as shown in FIG. Therefore, the energy storage unit receives power from the generator G and the regenerative current to charge the battery. The energy storage unit may roughly consist of a battery unit and a battery management system unit (BMS). The energy storage unit receives power from the generator G and the regenerative current at normal times to charge the battery and supplies emergency power in an emergency. The supply of such emergency power is as follows. As the excavation portion reaches the support layer (target lower layer), the load of the auger motor portion becomes larger and larger, and at this time, the production power of the generator G alone cannot support the load of the auger motor portion. At this time, the emergency power stored in the energy storage unit may be used to excavate the support layer which is a rock layer by supplying the auger motor unit M1 together with the generator G power in parallel. Since the rectifier, the charging circuit, and the inverter shown in FIG. 8 correspond to a general description, a description thereof will be omitted.

Next, after confirming the supporting layer (target lower layer), the control unit controls the drawing to rise approximately 4 [M] (the rising speed is approximately 0.3 to 1.0 M / MIN), and applies the cement slurry with a lower nozzle for forming an improved body. Injection is controlled to stir at a predetermined speed. This step is a two-stage excavation process, as shown in Figure 2, the two-stage excavation process, as shown in Figure 4, after checking the support layer in the first step 4 [M] pull up, stirring and lowering while injecting, and again Checking the support layer is performed. At this time, the support layer is confirmed by the method described in step 1.

Next, the control unit is controlled to stir for 2 minutes after the stirring wait after about 5 [M] stirring up to reinforce the reinforcing body (cement column) formed by the cement slurry injection and the filling layer (laminate stirring and lower discharge cleaning operation). In order to prevent clogging of the lower nozzle, it is preferable to perform the lower discharge cleaning operation in parallel. This step is a three-stage excavation process as shown in Figure 2, the three-stage excavation process as shown in Figure 5 is 5 [M] stirring rising for the reinforcing layer reinforcement construction after confirming the support layer in the second step, the bottom after the rise After performing the cleaning operation for preventing the clogging of the discharge for about 2 minutes, the stirring is lowered to the support layer again, and the step of checking the support layer is performed again. At this time, the support layer is confirmed by the method described in step 1. On the other hand, the excavation process according to an embodiment of the present invention performs a step of checking the support layer (target lower layer) at least three times. Depending on the excavation environment, the step of checking the support layer may be performed more or less. However, in the present invention, the step of confirming the support layer in the first, second and third stages, respectively.

Next, the control unit controls to switch from the lower discharge to the upper discharge, injects the cement slurry from the support layer (target lower layer) to the sand layer (target upper layer), and the preset speed (rising rate is approximately 0.3 to 1.0 M / MIN) and control to raise the draw while stirring. This step is a four-stage excavation process, as shown in Figure 2, the four-stage excavation process, as shown in Figure 6 is stirred up to the sand layer (target upper layer) after switching to the upper discharge.

Next, as shown in Figures 2 and 7, the control unit to lower the stirring 4.2 [M] for the upper layer reinforcement (re-stirring operation for the expression of the upper layer strength), and after washing the upper stirring bit portion 1 [M] After performing the washing operation of the lower stirring bit portion after the rise of 2.2 [M], and controlled to rise after the sand layer rises.

The above-described control unit is connected to the drilling equipment provided in the DCM vessel 10 by CAN communication and receives data from various drilling equipment in real time to monitor the state of the current equipment. For example, the control unit is connected to an auger motor, a plurality of stirring motors, a plurality of sea water pump motors, a plurality of show oil pumps, a plurality of inverters, various valves, winch motors and winch motor inverters, power control devices, etc. Understand the state of. The above-described control unit can be embodied with the DCM vessel the steering gear master controller.

In the following description of the present invention, those skilled in the art and those skilled in the art may omit descriptions, and descriptions of such omitted components (methods) and functions may be sufficiently referred to without departing from the technical spirit of the present invention. Could be.

Description of the configuration and functions of the above-described parts have been described separately from each other for convenience of description, and any configuration and function may be implemented by being integrated into other components, or may be further subdivided as necessary.

As mentioned above, although demonstrated with reference to one Embodiment of this invention, this invention is not limited to this, A various deformation | transformation and an application are possible. That is, those skilled in the art will readily appreciate that many modifications are possible without departing from the spirit of the invention. In addition, when it is determined that the detailed description of the known function and its configuration or the coupling relationship for each configuration of the present invention may unnecessarily obscure the subject matter of the present invention, it should be noted that the detailed description is omitted. something to do.

10: DCM ship
100: winch part
110: winch motor unit
200: tow wire part
300: Auger

Claims (6)

Moving the auger to an excavation position according to the control of the controller and drilling the drill at a preset excavation speed;
In the case of reaching the target lower layer, the cement slurry is injected and the improved body is formed by controlling the rising and falling repeatedly by a predetermined height based on the target lower layer,
Controlling, by the controller, to inject a cement slurry while the auger is pulled up at a predetermined speed based on the target lower layer to a target upper layer, and
And controlling, by the controller, the auger unit to perform a washing operation while pulling up after the auger unit is stirred and lowered to a predetermined depth based on the target upper layer.
The controller checks whether the excavation of the auger reaches the target lower layer in the step of improving the body,
The step of forming the improved body,
Confirming, by the controller, whether the excavation of the auger reaches a target lower layer,
Controlling the control unit to inject cement slurry and stir to the target lower layer after the control unit controls the auger to be drawn up to a predetermined height based on the target lower layer when the target lower layer is reached;
Confirming, by the controller, whether the excavation of the auger reaches a target lower layer,
Controlling the controller to perform a washing operation in parallel with the auger unit after the drawing is raised to a predetermined height based on the target lower layer to stir down to the target lower layer, and
And checking, by the controller, whether the excavation of the auger has reached a target lower layer,
The control unit,
Monitoring the load of the auger motor part, monitoring the excavation speed of the auger part, and monitoring the tension value of the traction wire part;
Checking whether a load of the auger motor unit is greater than or equal to a preset value, an excavation speed of the auger unit is less than or equal to a preset value, or a tension of the traction wire unit is less than or equal to a preset value,
And determining, by the controller, that the target lower layer has been reached when at least two or more conditions are met.
delete The method of claim 1,
Excavation control method of the deep mixing process method, characterized in that the control unit controls the auger so that the excavation speed and excavation depth of the auger portion of each excavation step.
delete Moving the auger to an excavation position according to the control of the controller and drilling the drill at a preset excavation speed;
In the case of reaching the target lower layer, the cement slurry is injected and the improved body is formed by controlling the rising and falling repeatedly by a predetermined height based on the target lower layer,
Controlling, by the controller, to inject a cement slurry while the auger is pulled up at a predetermined speed based on the target lower layer to a target upper layer, and
And controlling, by the controller, the auger unit to perform a washing operation while pulling up after the auger unit is stirred and lowered to a predetermined depth based on the target upper layer.
The controller checks whether the excavation of the auger reaches the target lower layer in the step of improving the body,
The step of forming the improved body,
Confirming, by the controller, whether the excavation of the auger reaches a target lower layer,
Controlling the control unit to inject cement slurry and stir to the target lower layer after the control unit controls the auger to be drawn up to a predetermined height based on the target lower layer when the target lower layer is reached;
Confirming, by the controller, whether the excavation of the auger reaches a target lower layer,
Controlling the controller to perform a washing operation in parallel with the auger unit after the drawing is raised to a predetermined height based on the target lower layer to stir down to the target lower layer, and
And checking, by the controller, whether the excavation of the auger has reached a target lower layer,
The control unit controls to store the regenerative current generated in the winch motor unit to pull the auger unit when the weight of the auger unit lowers, the energy storage unit,
The control unit excavation control method of the deep mixing process method, characterized in that for controlling to normally store the power supplied from the generator to the energy storage.
The method of claim 5,
The control unit controls to use the power of the energy storage unit with the generator power by controlling to supply emergency power from the energy storage unit to the auger motor unit when the auger unit reaches the target lower layer. Excavation Control Method.

Images