JP2008095388A - Construction management method in mixing processing construction method and its device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction management method and its device for controlling so as to provide an objective structure, by successively arithmetically operating and correcting a value of the tip depth of a construction machine, by inputting a change in a water level, while floating a pontoon on a water surface. <P>SOLUTION: This device is composed of a ground improvement measuring step of detecting the tip depth, a lifting speed, a blade cutting frequency and a delivery quantity of cement slurry of a mixing processing agitating shaft, a step of correcting and arithmetically operating the value of the tip depth of the agitating shaft by manually or automatically inputting a change in the water level caused by a tide level to this measured value, and a step of controlling so as to minimize a deviation between a workload being a reference value such as the lifting speed per unit depth and the delivery quantity of the cement slurry set in the arithmetic operation step and a target workload per unit depth. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a mixed processing method for securing a solid ground by floating a trolley equipped with a mixed processing construction machine on the surface of the sea or the like to inject and solidify a cement-based improvement material into a soft underwater ground. The present invention relates to a construction management method and its apparatus in a mixed processing method that makes it possible to construct a structure as designed by correcting various measurement values due to changes in the temperature.

  The mixed processing method for improving soft silty clay and sandy ground to solid ground has been adopted not only on land but also on the seabed and other waterbed ground. In this submerged ground, when constructing ground improvement such as revetment foundations, embankment foundations, and quay foundations for canals and rivers, the surface, middle and deep layers of the ground are used to ensure stability, prevent settlement, and prevent lateral movement. Etc. are solidified with cement-based improving materials to secure a solid ground.

  In the mixed processing method in which the ground is agitated with a stirring blade and an improved body is constructed, the finished shape of the improved pile is embedded in the ground and cannot be confirmed visually, so management during construction is an important factor. Conventionally, a device that detects the depth of the tip of the processing machine under construction, the lifting speed, the number of blades of the stirring blade, the discharge amount of cement slurry, the current value or torque value of the stirring shaft lifting motor is attached, and each value is set. Either it was detected and managed, or it was recorded in the construction management system and the finished shape of the improved pile was confirmed on the recording paper.

In land construction where there is no water level, the base machine is in contact with the original ground, the height of the original ground is set to zero, and depth management in the depth direction can be performed based on this zero point, and there is no problem. Construction management is possible.
However, in construction in places with rivers, lakes, sea level, etc., the mixing treatment machine is moved up and down from the trolley, and in the case of construction from the trolley, the water level is set to zero. Because there is only a method, the depth of construction always changes due to fluctuations in the tide level value, and changes occur at the zero point. The pattern change for each pile occurs every time taking into account the fluctuation of the tide level value, and it must be corrected.

During construction in a place with a tidal range, the tide level always fluctuates. For example, FIG. 9 shows the tide level in Tokyo (Harumi 5-chome, Chuo-ku, Tokyo) on July 12, 2006 announced by the Japan Meteorological Agency. When the tide level is large, there is a change of 40 to 50 cm per hour, and since the change is not constant, the processing machine penetration start (improved pile driving start time) and the processing machine pull-out completion (improved pile) The tide level at the time of placement is different. As a result, in the construction recording paper or the oscillograph, the processing machine tip position is shifted, and there is a contradiction between the processing machine tip position at the time of penetration and withdrawal and the processing machine tip position at the time of completion.
However, after completion of construction, measure the tip depth of the pile from the recording paper, and measure the depth of each pile to correct the depth. In some cases, poorly constructed piles due to fluctuations in the tide level (insufficient cement slurry discharge rate, blade cutting frequency) Currently, there is a shortage.

As a method of supporting work facilities such as trolleys so as not to be affected by changes in tide level and waves, a flat support base is created on the surface layer of the submarine ground, and the legs of the work facilities are supported by this support base. Such a construction method has been proposed (Patent Document 1).
JP 2004-44147 A

The construction method that supports the leg of the work facility such as a trolley on the flat support base created on the surface layer of the seabed described above is not affected by changes in tide level and waves, and has a strong seabed. Although there is an advantage that it is not necessary to extend a long leg to the bedrock, there are the following problems.
1. It requires extensive work to create a support base on the surface layer of the submarine ground. In some cases, it is necessary to remove the support base after completion of construction.
2. The created support base may interfere with excavation by the excavation part at the tip of the stirring shaft.
3. Since the place where the support base is created is originally a soft ground for constructing an improved body, it is troublesome to create a solid support base.
4). It is necessary to create a support base every time a trolley is moved.

  In the present invention, the trolley is left floating on the surface of the water, the change in the water level is input, the value of the tip depth of the processing machine is sequentially calculated and corrected, the correction of the reference work amount is calculated and instructed, and the target structure It is an object of the present invention to provide a construction management method and a device therefor in a mixed processing method for controlling so as to obtain the above.

  The construction management method in the mixed processing method according to the present invention is a mixed processing method that mixes and stirs while injecting a cement-based improving material into a water-bottomed soft ground with a stirring shaft for mixing processing having a stirring blade at the tip. The ground improvement measurement step for detecting the tip depth of the agitation shaft, the lifting speed, the number of blade cuttings, and the discharge amount of cement slurry, and the change of the water level in the measurement value obtained by the ground improvement measurement step are input to the stirring shaft. The calculation step for correcting the tip depth value and the deviation between the reference work per unit depth set in this calculation step and the target work per unit depth is made as small as possible. And a control step for controlling.

  According to the present invention, it is not necessary to perform a large-scale work for creating a support base on the surface layer of the seabed ground, and it is possible to construct a structure as designed by correcting various measurement values due to changes in tide level. .

  The invention according to claim 1 is a mixing processing method in which a mixing processing stirring shaft having a stirring blade at a tip portion is inserted into a water-bottomed soft ground and mixed and stirred while injecting a cement-based improvement material. The ground improvement measurement step for detecting the tip depth, lifting speed, blade cutting frequency, and discharge amount of cement slurry, and the value of the tip depth of the stirring shaft by inputting the change in the water level to the measurement value by this ground improvement measurement step Control step to correct and calculate to control the deviation between the reference work amount per unit depth set in this calculation step and the target work amount per unit depth as much as possible And a step.

  The invention according to claim 2 is a mixing processing method in which a mixing processing stirring shaft having a stirring blade at the tip is inserted into the bottom soft ground and mixed and stirred while injecting a cement-based improvement material. By inputting the change in the water level obtained from the automatic tide gauge into the ground improvement measurement step for detecting the tip depth, the lifting speed, the number of blade cuttings, the discharge amount of cement slurry, and the measurement value by this ground improvement measurement step The calculation step for correcting and calculating the tip depth value of the stirring shaft, and the deviation between the reference work amount per unit depth set in this calculation step and the target work amount per unit depth is as much as possible And a control step for controlling to be small.

  According to a third aspect of the present invention, there is provided a mixing processing method in which a mixing processing stirring shaft having a stirring blade at a tip portion is inserted into a water-bottomed soft ground and mixed and stirred while injecting a cement-based improvement material. Ground improvement measuring means for detecting tip depth, lifting speed, number of blade cutting, discharge amount of cement slurry, and correction calculation of the tip depth value of the agitation shaft by inputting the change in water level to this ground improvement measuring means And a control means for controlling the deviation between the work amount serving as a reference value per unit depth set from the calculation means and the target work amount per unit depth to be as small as possible. It is characterized by having.

  According to a fourth aspect of the present invention, there is provided a mixing processing method in which a mixing processing stirring shaft having a stirring blade at a tip portion is inserted into a water-bottomed soft ground and mixed and stirred while injecting a cement-based improvement material. The ground improvement measuring means for detecting the tip depth, the lifting speed, the number of blade cuttings, and the discharge amount of the cement slurry, and the stirring shaft by automatically inputting the water level change obtained from the automatic tide gauge to the ground improvement measuring means. Means for correcting and calculating the tip depth value, and the amount of work per unit depth and the reference value such as the lifting speed per unit depth, the number of blade cuttings, and the discharge amount of cement slurry set from this calculating means And a control means for controlling the deviation from the target work amount to be as small as possible.

  The invention according to claim 5 or 6 is characterized in that the water level data resulting from the tide level is calculated and used as the tide level at the construction site at the current time using the data for every predetermined time of the public organization.

  The invention according to claim 7 or 8 uses the water level data resulting from the tide level for each predetermined time of a public organization, and this data is compared with the data of the depth gauge on a trolley equipped with a construction machine. It is corrected and used as a tide level at the construction site at the current time.

In FIG. 1, reference numeral 12 denotes an improved ground such as a soft ground on the seabed. A sea ship 11 on which a construction machine 13 is mounted is floated on the sea surface 10 of the improved ground 12. The anchor 40 is lowered or moored with a rope from the land, and fixed to the flow.
In addition to the construction machine 13, a slurry plant 19, a grout pump 20, and a ground improvement measuring device 36 are mounted on the carriage 11.

In the construction machine 13, a single shaft as shown in FIG. 1 or a plurality of stirring shafts 14 as shown in FIG. The stirring shaft 14 is inserted into and extracted from the improved ground 12 by a motor 18. A plurality of stirring blades 15 are attached to the lower end portion of the stirring shaft 14, and an excavation portion 16 is attached to the distal end portion, and a discharge port 17 for cement slurry is formed.
The grout pump 20 is provided with a discharge meter 21, and a depth speed meter 22 is provided at the upper end of the column 37. A tachometer 23 and an ammeter 24 are connected to the motor 18, respectively, and data is sent to the construction machine measuring device 26.
In the present invention, the change in the tide level at the sea level 10 is read from a tide gauge (quantitative water mark) installed near the construction site or is calculated based on tide level data announced by the Japan Meteorological Agency, as will be described later. A depth gauge 25 such as a pressure detector is submerged from the carriage 11 to the seabed, and a change in the tide level of the sea surface 10 is sent to the construction machine measuring device 26.
A display 27 is connected to the construction machine measuring device 26 and is installed in the driver's seat of the construction machine 13 to display the contents of the display 35 as shown in FIG.

A construction management measuring device 28 and a construction management device 30 are sequentially connected to the ground improvement measuring device 36 on the management room side installed on the trolley 11 or on land. A display device 29 is connected to the construction management measuring device 28, and the display device 29 displays a display device 33 shown in FIG. 3, a tide level setting table 34 shown in FIG.
A daily report creating computer 31 and a printer 32 are connected to the construction management apparatus 30, and the construction management contents as shown in FIG. 6 are displayed on the daily report creating computer 31.

Next, the injection operation of the cement-based improving material will be described based on the flowchart shown in FIG.
(1) First step: The apparatus is started, and the pile management numbers and various set values as shown in FIG. For more information,
・ Management standards (up and down speed of stirring shaft 14, number of blade cutting)
・ Material mix (mixing ratio of improved material, cross-sectional area of pile)
・ Layer standard (number of layers, boundary depth, improvement category, design cement amount, standard slurry amount as shown in FIG. 2 or FIG. 7)
・ Pile No.
Confirm.

(2) Second step: A cement-based improvement material is injected into the improved ground 12 using a construction machine 13 by a conventionally known method as shown in FIG. 2 or FIG. 7, and measurement data is taken in from the ground improvement measuring device 36 every second. . As the measurement data, the depth and the ascending / descending speed of the stirring shaft 14 from the depth velocimeter 22, the shaft rotation speed from the tachometer 23, the slurry discharge amount from the discharge meter 21, and the current value from the ammeter 24 are taken in.

(3) Third step: “Is the tide level a time calculation?” Is determined.

(4) Fourth step: When the third step is YES, the tide level calculated value is taken from the ground improvement measuring device 36. Specifically, when the tide level setting button 38 of the display 33 shown in FIG. 3 is pressed, a tide level setting table 34 shown in FIG. 4 is displayed. The tide level announced by the Japan Meteorological Agency is input to the tide level setting table 34, and the instantaneous tide level is calculated from the set tide level.
For example, if the current time is 10:12:00, the tide level at 10:00 is 1.01m and the tide level at 11:00 is 0.73m.
The instantaneous tide level is 1.01+ (0.73-1.01) × 12 × 60 ÷ 3600 = 0.96
It becomes. From this instantaneous tide level, the tip depth = tide level−measured depth = 0.96−the depth measured by the depth velocimeter 22 is obtained.
The calculation items here are tide level, tip depth, and tip speed.

(5) Fifth step: If the third step is NO, the tide level measured by the tide level indicator (quantity water indicator), the depth depth meter 25, etc. is calculated and sent to the construction machine measurement device 26. The calculation item here is the tide level.

(6) Sixth step: The tip depth is calculated from the tide level obtained in the fourth step or the fifth step, and the section length of the pile is further calculated from the tip depth. The calculation items here are the tip depth and the section length.

(7) Seventh step: 1m line data is calculated, displayed, determined, a control signal is output, and an alarm is output. Specifically, 1 m row data is calculated from the section length and displayed on the display 27, the display 29, and the daily report creation computer 31.
The calculation item is a 1-m row section (discharge amount, shaft rotation speed, lifting speed).
The judgment is compared with the reference value of the calculation section, and when the tide level etc. is different from the reference value, a control signal is output from the control unit 39 to control the lifting speed, the number of blade cuts, the discharge amount, and output an alarm To do.
The control when the measured value is different from the reference value due to the tide level or the like will be described in more detail based on FIGS. 6 (a) and 6 (b).
FIG. 6B shows a case where the discharge amount, the shaft rotation speed, and the elevation speed are not controlled despite the change in the tide level.
In the case where the tide level does not change at 1.0 m, the discharge amount, the shaft rotation speed, and the ascending / descending speed show normal values when the tip depth is from -3.0 m to -3.8 m. However, when the tide level changes to 0.9 m, the ascending / descending speed increases to 2.0 m / min in combination with the decrease in tide level, which means that the shaft speed is 10 times / m (section length). The discharge amount is reduced to 50 liter / m (section length) where it should be 80 liter / 0.8 m. Furthermore, when the tide level changes to 0.8 m, the ascending / descending speed increases to 1.1 m / min in combination with the decrease in tide level, which means that the shaft speed is 18 times / m (section length). The discharge amount becomes 80 liters / m (section length).
FIG. 6A shows a case where the control unit 39 controls the discharge amount, the shaft rotation speed, and the lifting speed according to the change in the tide level. When the tide level changes to 0.9 m, the control unit 39 calculates and instructs a command to adjust the ascending / descending speed according to the tide level drop. As close as possible. The display is controlled and held at 1.0 m / min as shown in FIG. Therefore, the shaft rotation speed is kept 20 times / m (section length), and the discharge amount is 80 liters / 0.8 m. The same control is performed when the tide level changes to 0.8 m.
In this way, when the tide level changes, the control unit 39 controls the discharge amount, the shaft rotation speed, and the lifting / lowering speed accordingly, and a pile as designed is constructed.

(8) Eighth step: It is judged whether “measurement is finished”.

(9) Ninth step: “Section length = 1.0 m?” Is determined. If NO, return to the second step.

(10) Tenth step: If the ninth step is YES, the process proceeds to the next 1 m section and returns to the second step.

(11) Eleventh step: If “Is measurement completed?” In the eighth step, YES, the process ends and the process is ended.

In the first embodiment, the change in tide level is read from a tide gauge (quantitative water mark) installed near the construction site, or data published by the Japan Meteorological Agency is calculated and input for control. However, the tide level varies depending on the construction area and time.
In the second embodiment, an automatic tide gauge that measures the tide level at the site is installed at the construction site, and the discharge amount, shaft rotational speed, and lifting speed can be controlled by sequentially inputting data of the automatic tide gauge.

In the said Example 1 and 2, it was made to control as the sea level 10 occurred only by the change of a tide level. However, as shown by the dotted line in FIG. 9, the sea level 10 changes in addition to the tide level, such as by wind or waves of a ship that navigates nearby.
In the third embodiment, in addition to the tide level, data of a phenomenon that changes due to other causes can be sequentially input to control the discharge amount, the shaft rotation speed, and the elevation speed.

It is a block diagram which shows one Example of the construction management method and its apparatus in the mixed processing method by this invention. It is operation | movement explanatory drawing of the state which is improving the ground with two stirring shafts. It is explanatory drawing which shows an example of the indicator in FIG. It is explanatory drawing which shows an example of the tide level setting table | surface of the indicator in FIG. It is explanatory drawing which shows an example of the indicator in FIG. (A) is explanatory drawing which shows an example of the construction management monitor controlled considering the tide level, (b) is explanatory drawing which shows an example of the construction management monitor controlled without considering the tide level. It is operation | movement explanatory drawing of a general ground improvement. It is a flowchart of the construction management method and its apparatus in the mixed processing method by this invention. It is a waveform diagram of the day based on tide level data announced by the Japan Meteorological Agency.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Sea surface, 11 ... Dolly, 12 ... Improvement ground, 13 ... Construction machine, 14 ... Stirring shaft, 15 ... Stirring blade, 16 ... Excavation part, 17 ... Discharge port, 18 ... Motor, 19 ... Slurry plant, 20 DESCRIPTION OF SYMBOLS ... Grout pump, 21 ... Discharge meter, 22 ... Depth speed meter, 23 ... Tachometer, 24 ... Ammeter, 25 ... Depth meter, 26 ... Measuring device for construction machine, 27 ... Display, 28 ... For construction management Measuring device, 29 ... Display, 30 ... Construction management device, 31 ... Daily report creation computer, 32 ... Printer, 33 ... Display, 34 ... Tide level setting table, 35 ... Display, 36 ... Ground improvement measuring device, 37 ... Support column, 38 ... tide level setting button, 39 ... control unit, 40 ... anchor.

Claims (8)

  In the mixing processing method in which a mixing shaft with a stirring blade at the tip penetrates into the bottom soft ground and mixes and stirs while injecting cement-based improving material, at least the tip depth of the stirring shaft, the lifting speed, blade cutting The number of times, a ground improvement measurement step for detecting the discharge amount of cement slurry, and a calculation step for correcting and calculating the value of the tip depth of the stirring shaft by inputting a change in the water level to the measurement value by the ground improvement measurement step, A control step for controlling so that a deviation between a work amount serving as a reference value per unit depth set in the calculation step and a target work amount per unit depth is as small as possible. Construction management method in the mixed processing method.   In the mixing processing method in which a mixing shaft with a stirring blade at the tip penetrates into the bottom soft ground and mixes and stirs while injecting cement-based improving material, at least the tip depth of the stirring shaft, the lifting speed, blade cutting By inputting the change in the water level obtained from the automatic tide gauge to the ground improvement measurement step for detecting the number of times and the discharge amount of cement slurry, and the measurement value obtained by this ground improvement measurement step, the value of the tip depth of the stirring shaft is obtained. A calculation step for performing correction calculation, and a control step for controlling the deviation between the reference work amount per unit depth set in this calculation step and the target work amount per unit depth as small as possible The construction management method in the mixed processing method characterized by comprising.   In the mixing processing method in which a mixing shaft with a stirring blade at the tip penetrates into the bottom soft ground and mixes and stirs while injecting cement-based improving material, at least the tip depth of the stirring shaft, the lifting speed, blade cutting The ground improvement measuring means for detecting the number of times and the discharge amount of the cement slurry, the calculating means for correcting and calculating the value of the tip depth of the stirring shaft by inputting the change of the water level to the ground improvement measuring means, and the calculating means And a control means for controlling so that a deviation between a work amount serving as a reference value per unit depth and a target work amount per unit depth is set as small as possible. Construction management device in the processing method.   In the mixing processing method in which a mixing shaft with a stirring blade at the tip penetrates into the bottom soft ground and mixes and stirs while injecting cement-based improving material, at least the tip depth of the stirring shaft, the lifting speed, blade cutting The ground improvement measuring means that detects the number of times and the amount of cement slurry discharged, and the ground improvement measuring means automatically inputs the change in the water level obtained from the automatic tide gauge to the ground improvement measuring means to correct the tip depth value of the stirring shaft. And deviation between the reference work amount per unit depth and the target work amount per unit depth is possible. A construction management apparatus in the mixed processing method, characterized by comprising a control means for controlling to be as small as possible.   The construction management method in the mixed processing method according to claim 1 or 2, wherein water level data resulting from the tide level is calculated and used as a tide level at a construction site at a current time using data for every predetermined time of a public organization.   The construction management apparatus in the mixed processing method according to claim 3 or 4, wherein the water level data resulting from the tide level is calculated and used as a tide level at a construction site at the current time using data for every predetermined time of a public organization.   The water level data resulting from the tide level is used by the public institution at regular time intervals, and this data is corrected against the data of the depth gauge on the trolley equipped with the construction machine, and the tide level at the construction site at the current time is corrected. The construction management method in the mixed processing method according to claim 1 or 2, wherein the construction processing method is used as calculated.   The water level data resulting from the tide level is used by the public institution at regular time intervals, and this data is corrected against the data of the depth gauge on the trolley equipped with the construction machine, and the tide level at the construction site at the current time is corrected. The construction management apparatus in the mixed processing method according to claim 3 or 4, wherein the construction management device is used as calculated.

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