JP7056801B2 - Construction method of rotary pile, manufacturing method of pile group, pile group, construction management device of rotary pile, construction management system of rotary pile - Google Patents

Description

The present invention relates to a method of constructing a rotary pile, a method of manufacturing a group of piles, a group of piles, a construction management device for a rotary pile, and a construction management system for a rotary pile.

Conventionally, in order to penetrate a rotary pile provided with a spiral blade into the ground, for example, a construction management method as in Patent Documents 1 and 2 has been proposed.

In Patent Document 1, in the construction management method of a rotary press-fit pile having one or a plurality of blades on the outer surface of the lower end of the pile, measurement data of the penetration amount per rotation of the pile at the time of construction is obtained and the rotary press-fit pile is obtained. It is disclosed that the optimum intrusion construction is possible, and that the indentation bearing capacity or the withdrawal resistance of the rotary press-in pile can be calculated together with the measurement data of the torque and the loading load at the pile head.

In Patent Document 2, in the construction management method for rotary intrusion steel pipe piles, a rotary intrusion performed by connecting a full swivel machine for rotating and intruding steel pipe piles into the ground and a heavy machine such as a crawler crane via a reaction force bar in one direction. It is disclosed that in the construction of steel pipe piles, it is characterized in that damage to the pile body is prevented by controlling the axial force acting on the steel pipe piles or the torque acting on all the swivel machines.

Japanese Patent Application Laid-Open No. 2002-21076 Japanese Unexamined Patent Publication No. 2005-23775

However, there have been reports of cases where the rotating piles are damaged when the conventional construction management methods and the construction management methods of Patent Documents 1 and 2 are implemented. The prevention of damage to the rotating pile is based on the experience of the construction worker. As a result, there is a problem that the work efficiency is lowered by using the construction conditions on the safety side more than necessary so that the rotary pile is not damaged or the rotary pile is not damaged. Therefore, there is a demand for a construction method that can prevent damage to the rotating pile by appropriately managing the construction conditions.

Therefore, the present invention has been devised in view of the above-mentioned problems, and the object thereof is a method of constructing a rotating pile capable of preventing damage to the rotating pile, a method of manufacturing a pile group, and a method of manufacturing the pile group. The purpose is to provide the pile group, the construction management device for the rotary pile, and the construction management system for the rotary pile.

The method for constructing a rotary pile according to the first invention is a construction method for penetrating a rotary pile provided with blades into the ground, and the amount of fluctuation of the rotary pile while the rotary pile is rotationally press-fitted into the ground. And a measurement step of measuring pile information including the rotational torque of the rotary pile, a comparison step of determining normality or abnormality of the pile body from the relationship between the rotary torque and the amount of eccentricity based on a preset threshold, and the pile information. Based on the above, a control step for controlling the conditions for rotational press-fitting of the rotary pile is provided, and in the control step, the rotational torque of the rotary pile is reduced, or rotation is stopped or reversed based on the result of the comparison step. It is characterized by controlling to do so.

The method for constructing a rotary pile according to the second invention is the first invention, in which the measurement step includes a movement amount in a horizontal plane from the initial installation position of the rotary pile, a casing driver for gripping the rotary pile, and the rotary pile. It is characterized in that at least one of the relative inclination amounts of is measured as the fluctuation amount.

In the second invention, the method for constructing a rotary pile according to the third invention measures the amount of misalignment of the support plate sandwiched between the ground and the casing driver as the fluctuation amount in the measurement step. It is characterized by that.

The method for constructing a rotary pile according to the fourth invention further includes, in any one of the first to third inventions, the pile information further includes at least one of the penetration amount of the rotary pile and the loading load of the rotary pile. It is characterized by that.

The method for constructing a rotary pile according to a fifth aspect of the present invention is any of the first to fourth inventions, wherein the control step includes reference pile information regarding preset rotational press-fitting conditions of the rotary pile and the pile information. It is characterized by having a comparison step of comparing with and determining normality or abnormality.

The method for manufacturing a pile group according to the sixth invention is to manufacture a pile group including a plurality of rotary piles penetrating to the support layer of the ground by the method for constructing a rotary pile according to any one of the first invention to the fifth invention. It is characterized by.

The pile group according to the seventh invention is manufactured by the method for manufacturing the pile group according to the sixth invention, and is characterized by including a plurality of rotary piles penetrating to the support layer of the ground.

The construction management device for a rotary pile according to the eighth invention is a construction management device used for penetrating a rotary pile provided with blades into the ground, and measures the rotary pile during rotary press-fitting into the ground. The pile information includes an acquisition unit for acquiring the pile information, a storage unit for storing the pile information, and a display unit for displaying the pile information, and the pile information includes the fluctuation amount of the rotating pile. And.

The method for managing the construction of a rotary pile according to the ninth aspect of the present invention includes, in the eighth invention, a comparison unit that compares the reference pile information regarding the conditions for rotational press-fitting of the rotary pile with the pile information and classifies them as normal or abnormal. When the comparison unit classifies the pile information as an abnormality, the comparison unit further includes a generation unit that generates notification information for notifying the operator of the abnormality, and the reference pile information is stored in the storage unit in advance. It is a feature.

The construction management system for rotary piles according to the tenth invention is a construction management system used for penetrating a rotary pile provided with blades into the ground, and measures the rotary piles during rotary press-fitting into the ground. The pile information includes an acquisition means for acquiring the pile information, a storage unit for storing the pile information, and an output means for outputting the pile information, and the pile information includes a fluctuation amount of the rotating pile. And.

According to the first to fifth inventions, in the measurement step, while the rotary pile is rotationally press-fitted into the ground, pile information including the fluctuation amount of the rotary pile and the rotational torque of the rotary pile is measured, and a preset threshold value is set. Based on the above, the normality or abnormality of the pile body is judged from the relationship between the rotational torque and the amount of eccentricity. Therefore, the operator can estimate the state of the rotating pile during rotational press-fitting based on the amount of fluctuation, and reduce or rotate the rotational torque of the rotating pile based on the judgment result of normality or abnormality of the pile body. Is controlled to stop or reverse. This makes it possible to prevent damage to the rotating pile.

In particular, according to the second invention, in the measuring step, at least one of the amount of movement of the rotating pile from the initial setting position in the horizontal plane and the amount of relative inclination between the casing driver and the rotating pile is measured as the fluctuation amount. Therefore, the amount of fluctuation can be measured without making a significant change from the conventional construction method. This makes it possible to easily measure the amount of fluctuation.

In particular, according to the third invention, in the measuring step, the amount of misalignment of the support plate is measured as the amount of fluctuation. Therefore, as compared with the case where the fluctuation amount of the rotating pile is directly measured, it is possible to suppress the variation of the measured value due to the rotation of the rotating pile. This makes it possible to measure the amount of fluctuation with high accuracy.

In particular, according to the fourth invention, the pile information further includes at least one of the penetration amount of the rotary pile and the loading load of the rotary pile. Therefore, the operator can estimate the state of the rotary pile after combining the fluctuation amount of the rotary pile and the rotary press-fitting condition. This makes it possible to prevent damage to the rotating pile based on multiple viewpoints.

In particular, according to the fifth invention, in the comparison step, the reference information and the pile information are compared, and normality or abnormality is determined. Therefore, it is possible to suppress variations in the subjective judgment criteria for each worker. This makes it possible to prevent damage to the rotating pile regardless of the work proficiency of the worker.

In particular, according to the sixth and seventh inventions, the rotary pile is penetrated to the support layer of the ground by the method of constructing the rotary pile in any one of the first to fifth inventions. By penetrating a plurality of rotating piles to the support layer of the ground by this construction method, it becomes possible to manufacture and realize a pile group including a plurality of rotating piles constructed in a state where damage is prevented.

According to the eighth invention and the ninth invention, the acquisition unit acquires the pile information including the fluctuation amount of the rotary pile measured during the rotary press-fitting of the rotary pile with respect to the ground. In addition, the display unit displays pile information. That is, the operator can confirm the amount of fluctuation that causes damage to the rotating pile through the display unit. Therefore, the operator can estimate the state of the rotating pile based on the fluctuation amount. This makes it possible to prevent damage to the rotating pile.

In particular, according to the ninth invention, when the generation unit classifies the pile information as an abnormality in the comparison unit, the generation unit generates the notification information. Therefore, by displaying an alert on the display unit or the like based on the notification information, it is possible to notify the operator that the possibility of damage to the rotating pile has increased. As a result, the worker does not have to constantly monitor the pile information via the display unit or the like, and the workability can be improved. In addition, it is possible to suppress variations in subjective judgment criteria for each worker. This makes it possible to prevent damage to the rotating pile regardless of the work proficiency of the worker.

According to the tenth invention, the acquisition means acquires pile information including the amount of fluctuation of the rotary pile, which is measured while the rotary pile is rotationally press-fitted into the ground. That is, the amount of fluctuation that causes damage to the rotating pile can be notified to the operator, the work manager, or the like via the display unit or the like. Therefore, the worker, the work manager, and the like can estimate the state of the rotating pile based on the fluctuation amount. This makes it possible to prevent damage to the rotating pile.

(A) is a cross-sectional view showing an example of a method of constructing a rotary pile in the present embodiment, and (b) is a cross-sectional view showing a state in which the rotary pile in the present embodiment is penetrated to a support layer. c) is a cross-sectional view showing a state in which the rotary pile is eccentric and penetrates into the ground. It is a block diagram which shows an example of the construction management system of a rotary pile in this embodiment. It is a perspective view which shows an example of the auger machine and various measuring machines used for the construction management system of a rotary pile in this embodiment. It is a perspective view which shows the example of the amount of eccentricity. It is a top view which shows an example of the casing driver used for the construction management system of a rotary pile in this embodiment. (A) is a cross-sectional view showing an example of a casing driver and various measuring instruments used in the construction management system of a rotary pile in this embodiment, and (b) is a plane along line 6B-6B in (a). It is a figure. (A) is a flowchart showing an example of a rotating pile construction method in the present embodiment, and (b) is a flowchart showing an example of a control process. It is a graph which shows the relationship between the rotational torque acting on a rotary pile, and the analysis result of the stress concentration part in a rotary pile. It is a graph which shows the relationship between the amount of eccentricity and the rotational torque. It is a graph which shows the eccentricity amount, the rotational torque, and the loading load relation. It is a side view which shows an example of the rotary pile during rotary press-fitting. It is a schematic diagram which shows the modification of the construction management system of a rotary pile in this embodiment. (A) is a schematic diagram showing an example of the configuration of the rotating pile construction management device in the present embodiment, and (b) is a schematic diagram showing an example of the function of the rotating pile construction management device in the present embodiment. be. (A) is a flowchart showing an example of the operation of the construction management system of a rotary pile in this embodiment, and (b) is a flowchart showing an example of a comparison means and a notification means. It is a graph which shows an example of a construction record.

Hereinafter, a mode for implementing a rotating pile construction method to which the present invention is applied, a rotating pile, a rotating pile construction management device (hereinafter, construction management device), and a rotating pile construction management system (hereinafter, construction management system). Will be described in detail with reference to the drawings.

(Construction method of rotary pile, rotary pile 17, construction management device 6, construction management system 100)
As shown in FIG. 1A, the method of constructing a rotary pile in this embodiment is carried out in order to penetrate the rotary pile 17 into the ground 91. In the method of constructing a rotary pile, for example, the rotary pile 17 is gripped by using a casing driver 21 or the like, the rotary pile 17 is rotationally press-fitted into the ground 91 in the pile axial direction Z, and the rotary pile 17 is penetrated to the support layer 92. (For example, FIG. 1 (b)). In the method of constructing a rotary pile, for example, the construction management system 100 described later is used.

In the method of constructing a rotary pile, the fluctuation amount of the rotary pile 17 is measured while the rotary pile 17 is rotationally press-fitted into the ground 91 by using, for example, a fluctuation amount measuring machine 1. The amount of fluctuation indicates at least one of the amount of movement (amount of displacement) in the horizontal plane from the initial setting position of the rotary pile 17 and the amount of inclination (amount of change in the tilt angle) due to the rotational press-fitting of the rotary pile 17. The amount of fluctuation of the rotary pile 17 can be obtained by using, for example, the support plate 41 sandwiched between the ground 91 and the casing driver 21 that grips the rotary pile 17. In this case, the amount of misalignment of the support plate 41 due to the rotational press-fitting of the rotary pile 17 can be measured as the amount of fluctuation of the rotary pile 17.

Here, the inventor has found that the fluctuation amount of the rotary pile 17 during the rotary press-fitting is related to the degree of eccentricity (eccentricity amount) of the rotary pile 17 in the direction X orthogonal to the pile axis. As shown in FIG. 1C, for example, the eccentricity of the rotary pile 17 occurs when the rotary pile 17 is rotationally press-fitted into the ground 91, and the amount of eccentricity of the rotary pile 17 is determined by the spiral blade 16 of the rotary pile 17. It tends to grow when it comes in contact with hard ground or obstacles. Therefore, for example, as shown in FIG. 1C, if the rotary pile 17 is continuously rotationally press-fitted in an eccentric state, the additional bending force acting on the rotary pile 17 increases, and the rotary pile 17 increases. Is more likely to be damaged.

During the rotational press-fitting of the rotary pile 17, the eccentricity tends to correlate with the fluctuation amount. Therefore, the amount of eccentricity of the rotating pile 17 can be estimated by adding the amount of fluctuation to the conditions of construction management. For example, when the fluctuation amount of the rotary pile 17 exceeds a predetermined value, it can be determined that the rotary pile 17 has reached an eccentricity amount at which there is a high possibility of damage. Therefore, in the method of constructing a rotary pile, the pile information including the fluctuation amount of the rotary pile 17 and the rotary torque of the rotary pile is measured, and the pile body is normal from the relationship between the rotary torque and the eccentricity based on a preset threshold value. Alternatively, the operator can estimate the state of the rotary pile 17 by determining the abnormality. Then, by reducing the rotational torque of the rotary pile or controlling the rotary pile to invert based on the determination result of normality or abnormality of the pile body, it is possible to prevent the rotary pile 17 from being damaged.

For example, the position of the rotary pile 17 when the rotary pile 17 reaches the support layer 92 from the initial installation position of the rotary pile 17 (two-point chain line in FIG. 1C) before the rotary press-fitting is performed (FIG. When the amount of positional deviation up to 1 (c) is measured as the amount of fluctuation, the measured amount of fluctuation can be estimated as the amount of eccentricity e1 of the rotary pile 17.

The rotary pile 17 in the present embodiment is composed of a rotary pile main body and a spiral blade 16 provided at the tip thereof. The rotary pile body is formed by, for example, a plurality of steel pipes welded and connected in the longitudinal direction. The rotary pile 17 penetrates into the ground 91, and for example, the tip of the pile penetrates into the support layer 92. The shape of the blades of the rotary pile 17 is not limited to the spiral, and for example, a pair of semicircular blades may be provided on the rotary pile main body instead of the spiral blade 16.

The pile diameter of the rotary pile 17 is, for example, about φ100 mm to 1600 mm, and the pile plate thickness is, for example, about 4.2 mm to 25 mm. The diameter of the spiral blade 16 is, for example, about 1.5 to 2.5 times the diameter of the pile. The support layer 92 into which the tip of the rotating pile 17 is penetrated is, for example, sand, gravel ground, or cohesive soil, or the soil is sandy soil or gravel soil layer, and satisfies conditions such as an N value of 15 or more. Shows the ground.

The construction management system 100 for rotating piles in the present embodiment includes a construction management device 6 as shown in FIG. 2, for example. FIG. 2 shows a schematic view in which various measuring machines 1 to 5 for measuring pile information indicating a construction state of the rotary pile 17 and a construction management device 6 are arranged.

The construction management system 100 includes a fluctuation amount measuring machine 1 for measuring the fluctuation amount of the rotating pile 17, for example, at least a rotation angle measuring machine 2, a penetration amount measuring machine 3, a rotating torque measuring machine 4, and a loading load measuring machine 5. Either may be provided. The construction management system 100 may include the above-mentioned various measuring instruments 1 to 5 and a data converter 7 capable of transmitting and receiving data, and an interface box 8 for connecting the data converter 7 and the construction management device 6. The construction management system 100 may include, for example, a data input unit 9 capable of inputting N value data previously surveyed in a soil survey, or for example, N value data may be stored in the construction management device 6 in advance. .. The construction management device 6 can acquire data from various measuring instruments 1 to 5, perform arithmetic processing as necessary, display it on the monitor screen 6b, and print it by the connected printer 6c.

<Auger Machine 15>
In the construction management system 100 for a rotary pile, for example, a pile driver leader 10 and an auger machine 15 are used as a rotary press-fitting device for the rotary pile 17. FIG. 3 is a perspective view showing an example of a pile driver leader 10 and an auger machine 15.

In the pile driver leader 10, for example, as shown in FIG. 3, the pile driver main body 13 is provided on the swivel support base 12 supported by the infinite track body 11. The tilt support arm 14 extends upward from both ends of one end of the pile driver main body 13, and the auger machine 15 is supported by the upper end of the tilt support arm 14. The auger machine 15 grips the pile head of the rotary pile 17. The construction management device 6 is connected to, for example, a data converter 7 attached to the driver's cab 19 to acquire various data.

The fluctuation amount measuring device 1 is used in a state of being fixed on the ground 91. The fluctuation amount measuring device 1 measures, for example, the distance to the rotary pile 17. The fluctuation amount measuring machine 1 measures, for example, the distance to the rotary pile 17 during the rotary press-fitting, with the distance to the rotary pile 17 before the rotary press-fitting into the ground 91 (initial state) as an initial value, and the difference between the distances (the difference between the distances (initial state). The amount of misalignment) is measured as the amount of fluctuation.

As the fluctuation amount measuring device 1, a known distance measuring device such as a laser range finder is used. The fluctuation amount may be measured by using the construction management device 6 based on the distance to the rotary pile 17 measured by the fluctuation amount measuring machine 1.

As the fluctuation amount measuring device 1, for example, an inclinometer may be used. In this case, the fluctuation amount measuring machine 1 is attached to the auger machine 15, the rotary pile 17, or the like. In this case, the tilt angle in the initial state is set as the initial value, the tilt angle during rotational press-fitting is measured, and the difference (tilt amount) of each tilt angle is measured as the fluctuation amount.

For example, as shown in FIG. 4, when the initial installation position of the rotary pile 17 is indicated by a two-dot chain line and the rotation axis of the auger machine 15 is indicated by a broken line, the eccentricity e2 based on the inclination amount (variation amount) is expressed by the following equation. Estimated in (1).
e2 = Lp × tanθe ・ ・ ・ (1)
Lp: the distance from the pile head to the tip of the rotary pile 17, θe: the relative inclination amount between the rotary axis of the auger machine 15 and the rotary pile 17 protruding on the ground 91.

Further, as the fluctuation amount measuring device 1, for example, either a distance measuring device or an inclinometer may be used. In this case, the amount of misalignment and the amount of inclination are measured as the amount of fluctuation. Further, for example, as shown in FIG. 4, when the amount of misalignment and the amount of inclination are measured as the amount of fluctuation, the amount of eccentricity e may be estimated by the following equation (2) based on the amounts of eccentricity e1 and e2. ..
e = e1 + e2 ... (2)

The rotation angle measuring machine 2 measures the rotation angle of the rotating pile 17. As the rotation angle measuring device 2, for example, a rotation angle measuring sensor having a magnetic reaction proximity switch 2a and a metal piece 2b is used. The magnetic reaction proximity switch 2a is provided on the non-rotating frame member 15b of the auger machine 15. A plurality of metal pieces 2b (for example, 2 to 8 places) are provided on the rotating body 15c in the main body portion 15a of the auger machine 15.

In such a rotation angle measurement sensor, a pulse signal is generated every time the rotating pile 17 and the rotating body 15c rotate and the metal piece 2b approaches the magnetic reaction proximity switch 2a in a non-contact manner, and the rotation angle can be measured. For example, when the metal pieces 2b are evenly provided at eight locations in the pile circumferential direction W, a pulse signal is generated every 45 degrees of rotation angle. Further, for example, when the metal pieces 2b are evenly provided at two locations in the pile circumferential direction W, a pulse signal is generated every 180 degrees of rotation angle.

As the rotation angle measuring device 2, the method using the above-mentioned rotation angle measuring sensor is the simplest and has few failures, but another contact switch method or a method using a known configuration such as an encoder angle sensor may be adopted. ..

The intrusive amount measuring machine 3 measures the intrusive amount of the rotary pile 17. As the penetration amount measuring device 3, for example, a penetration amount measuring sensor having a wire rope 3a and an encoder 3b is used. The wire rope 3a is provided so that the tip portion thereof is connected to the auger machine 15 and the wire rope 3a is folded back at the upper end of the pile driver leader 10 and guided to the pile driver main body 13 to be wound. The encoder 3b is provided on the pile driver main body 13 and measures the amount of movement of the wire rope 3a as the amount of penetration of the rotary pile 17.

As the intrusive amount measuring device 3, the above-mentioned intrusive amount measuring sensor may be used, or a known measuring sensor or the like may be used.

The rotational torque measuring machine 4 measures the rotational torque when the rotary pile 17 is rotationally press-fitted. As the rotational torque measuring device 4, for example, an auger ammeter 4a is used. In this case, it can be measured by the drive current of an auger, which is a conventionally known measuring means.

The loading load measuring machine 5 measures the loading load (pressure input) applied to the pile head of the rotary pile 17. As the loaded load measuring device 5, for example, a load cell 5a is used. The load cell 5a is attached between the upper end of the pile driver leader 10 and the end of the wire rope 3a suspending the auger machine 15, and measures the tensile force of the wire rope 3a. Therefore, the loading load acting on the rotary pile 17 is a value obtained by subtracting the measured value of the load cell 5a from the own weight of the auger machine 15. If the loading load is insufficient only by the weight of the auger machine 15, another wire rope that draws in the auger machine 15 may be provided by using the pile driver main body 13 as a reaction force. In this case, the load cell 5a is also attached to the other wire rope, and the measurement data of the two load cells 5a are added to obtain the loading load.

As the loaded load measuring device 5, the load cell 5a described above may be used, or a known pressure input measuring device may be used.

<Casing driver 21>
In the rotating pile construction management system 100, for example, as shown in FIGS. 5 and 6, the casing driver 21 may be used as the rotary press-fitting device for the rotary pile 17. FIG. 5 is a top view showing an example of the casing driver 21. FIG. 6 is a schematic view showing an example of the casing driver 21.

Also in this case, the construction management system 100 is the same as the main configuration shown in FIG. 2 described above. Hereinafter, a configuration different from that provided with the auger machine 15 will be described, and the same description will be omitted as appropriate.

The casing driver 21 is supported by the crawler crane 21a via the reaction force bar 21b, for example, as shown in FIG. The rotary pile 17 is inserted into the casing driver 21 in a state of being suspended by the crawler crane 21a.

As shown in FIG. 6A, for example, the casing driver 21 is provided on the support plate 41 and grips the rotary pile 17. As the casing driver 21, for example, a known casing driver having a pedestal 26, a press-fitting hydraulic jack 24, a non-rotating frame member 27, a hydraulic motor 23, a swivel ring 22, and a grip portion 25 is used.

The pedestal 26 is provided on the support plate 41. The press-fitting hydraulic jack 24 is installed on the pedestal 26, and for example, four are used. The non-rotating frame member 27 is attached to the press-fitting hydraulic jack 24. The hydraulic motor 23 is supported by the non-rotating frame member 27, and a rotational torque is applied to the swivel ring 22. The swivel ring 22 is rotated by a hydraulic motor 23 via a gear mechanism 28 and a bearing mechanism 29. The grip portion 25 is connected to the upper portion of the swivel ring 22 so as to rotate integrally, and grips the rotary pile 17 using the handle 30.

The support plate 41 is sandwiched between the casing driver 21 and the ground 91. The support plate 41 tends to be displaced from the position installed together with the casing driver 21 and the rotary pile 17 as the amount of eccentricity in the rotary pile 17 during rotary press fitting increases.

For example, when estimating the eccentricity e1 shown in FIG. 1 (c), the amount of movement of the support plate 41 in the horizontal plane from the initial installation position may be measured as the amount of fluctuation. In this case, the measured fluctuation amount can be estimated as the eccentric amount e1. Further, when estimating the eccentricity amount e2, the relative inclination amount between the rotation axis of the casing driver 21 and the rotation pile 17 protruding on the ground 91 may be measured as the fluctuation amount. In this case, the eccentricity e2 is estimated by the above equation (1). In addition to the above, the eccentricity e may be estimated using the above-mentioned equation (2).

The fluctuation amount measuring device 1 is provided on the ground 91 at a distance from the support plate 41. In this case, the fluctuation amount measuring device 1 measures, for example, the distance to the support plate 41 during the rotational press-fitting of the rotary pile 17, with the distance to the support plate 41 in the initial state as the initial value, and the difference between the distances (positional deviation). Amount) is measured as the amount of fluctuation of the rotating pile 17.

During the rotary press-fitting of the rotary pile 17, the fluctuation range of the rotary pile 17 includes not only the fluctuation of the plane parallel to the ground 91 but also the fluctuation of the inclination. Therefore, it is preferable to measure at least one of the fluctuation of the plane and the fluctuation of the inclination. Note that FIG. 1 (c) shows a state in which the inclination of the rotary pile 17 (relative amount of inclination between the casing driver 21 and the rotary pile 17) is zero, but it is shown from the state of FIG. 1 (a). In the process of reaching the state of 1 (c), the rotary pile 17 may be tilted.

Here, the range of fluctuation of the support plate 41 is only the fluctuation of the plane parallel to the ground 91 (the amount of movement in the horizontal plane). Therefore, when the amount of displacement of the support plate 41 is measured as the amount of fluctuation of the rotary pile 17 by using the fluctuation amount measuring machine 1, the fluctuation region is narrower than that of the case of directly measuring the amount of fluctuation of the rotary pile 17. .. Further, when the fluctuation amount of the rotary pile 17 is directly measured, it is necessary to measure the fluctuation amount during the rotation of the rotary pile 17, and the variation in the measurement due to the rotation may become large. Based on these, by measuring the amount of misalignment of the support plate 41 as the amount of fluctuation of the rotating pile 17, it is possible to suppress the variation in the measured values.

The fluctuation amount measuring device 1 may be provided on the support plate 41, for example. In this case, the measurement reference unit is provided on the ground 91 separated from the support plate 41 (for example, the position of the fluctuation amount measuring device 1 in FIG. 6A), and the distance to the measurement reference unit is measured. The fluctuation amount of the rotary pile 17 can be measured in the same manner as above.

As the rotation angle measuring device 2, the above-mentioned rotation angle measuring sensor can be used. In this case, the magnetic reaction proximity switch 2a is provided on the non-rotating frame member 27. The metal piece 2b is provided on the swivel ring 22. As a result, similar to the rotation angle measurement sensor described above, a pulse signal is generated according to the rotation of the rotation pile 17, and the rotation angle can be measured.

As the penetration amount measuring device 3, for example, a stroke sensor 3c that measures the stroke of the press-fitting hydraulic jack 24 can be used. The stroke sensor 3c is provided between the cylinder 24a of the press-fitting hydraulic jack 24 and the pedestal 26. As the stroke sensor 3c, a known measurement method such as a linear displacement meter or a potentiometer method using a string or the like can be used.

As the rotational torque measuring machine 4, for example, a known pressure sensor (hydraulic pressure sensor) that measures the hydraulic pressure of the hydraulic motor 23 that rotationally drives the swivel ring 22 can be used.

As the loaded load measuring device 5, for example, a known pressure sensor that measures the hydraulic pressure of the press-fitting hydraulic jack 24 can be used.

(Example of construction method of rotating pile)
Next, an example of the construction method of the rotary pile in the present embodiment will be described with reference to FIG. 7. FIG. 7 is a flowchart showing an example of the construction method of the rotary pile in the present embodiment.

The method for constructing a rotary pile in the present embodiment includes a rotary press-fitting process S100, a measuring process S110, and a control process S120. For example, while performing the rotary press-fitting process S100, the measuring process S110 and the control process S120 are repeatedly performed as appropriate. do.

<Rotary press-fitting process S100>
In the rotary press-fitting step S100, the rotary pile 17 is gripped by the auger machine 15 or the casing driver 21, and the tip portion provided with the spiral blade 16 is brought into contact with the ground 91. After that, the rotary pile 17 is rotationally press-fitted into the ground 91.

<Measurement process S110>
The measurement step S110 measures pile information including the amount of fluctuation of the rotary pile 17 while the rotary pile 17 is rotationally press-fitted to the ground 91. In addition to the fluctuation amount of the rotary pile 17, the pile information may include at least one of, for example, the rotation angle of the rotary pile 17, the penetration amount of the rotary pile 17, the rotational torque of the rotary pile 17, and the loading load of the rotary pile 17. ..

The cycle for measuring the pile information is, for example, a predetermined value of 1 second or more and 60 seconds or less, and is arbitrarily set according to the construction conditions and the like. When the cycle for measuring pile information is shortened, the state of the rotating pile 17 can be monitored with high accuracy. On the other hand, if the cycle for measuring pile information is lengthened, the amount of accumulated data can be reduced.

In the measurement step S110, for example, the fluctuation amount measuring machine 1 is used to measure the fluctuation amount from the rotary pile 17, and for example, the amount of misalignment of the support plate 41 is measured as the fluctuation amount of the rotary pile 17. In the measurement step S110, for example, at least one of the amount of movement of the rotary pile 17 in the horizontal plane from the initial setting position and the relative inclination amount of the casing driver 21 and the rotary pile 17 is measured as the fluctuation amount. In the measurement step S110, for example, one of the eccentricity e, e1 and e2 calculated based on the fluctuation amount may be acquired as pile information by referring to the above-mentioned equation (1) or equation (2). ..

In the measurement step S110, the fluctuation amount is measured by using the fluctuation amount measuring device 1, and the fluctuation amount may be measured by using a measuring tool such as a ruler or a gauge. In this case, for example, the operator uses a measuring tool to measure the amount of positional deviation of the support plate 41 from the initial value, so that the amount of fluctuation of the rotary pile 17 is measured. For example, the fluctuation amount may be measured by inputting the value measured by the operator into the construction management device 6.

By measuring the amount of misalignment using a measuring tool, the operator can smoothly carry out the measurement step S110 even in a place where the fluctuation amount measuring machine 1 cannot be installed. The fluctuation amount of the rotary pile 17 may be measured by the operator using, for example, a portable small fluctuation amount measuring machine 1.

In the measurement step S110, the rotation angle of the rotary pile 17, the penetration amount of the rotary pile 17, the rotational torque of the rotary pile 17, and the loading load of the rotary pile 17 are, for example, the above-mentioned rotary angle measuring machine 2 and the penetration amount measuring machine, respectively. 3. Measured using the rotary torque measuring machine 4 and the loaded load measuring machine 5.

<Control process S120>
Next, the control step S120 controls the conditions for rotational press-fitting of the rotary pile 17 based on the pile information. In the control step S120, for example, the reference pile information regarding the condition of the rotary press-fitting of the rotary pile 17 set in advance is referred to as a determination standard, and the condition for rotary-press-fitting the rotary pile 17 is set. The reference pile information indicates, for example, a control value such as a threshold value and an allowable range for the fluctuation amount included in the pile information.

In the control step S120, for example, when the fluctuation amount measured in the measurement step S110 exceeds the threshold value included in the reference pile information, the condition is set so that the rotational torque is reduced or reversed. The above-mentioned "controlling the conditions for rotational press-fitting of the rotary pile 17" means that the conditions for rotationally press-fitting the rotary pile 17 are changed based on the pile information, and the rotary press-fitting is performed without changing the conditions. This includes the case of advancing and the case of stopping the rotary press-fitting. Details of the reference pile information will be described later.

Then, by carrying out the steps S100 to S120 and penetrating the rotary pile 17 to a predetermined depth, the construction method of the rotary pile in the present embodiment is completed. As shown in FIG. 7A, by performing the control step S120 and then the measurement step S110 again, it is possible to realize the penetration of the rotary pile 17 according to the depth of the arbitrary ground 91. can.

The control step S120 has a comparison step S121. In the comparison step S121, normality or abnormality of the pile body is determined from the relationship between the rotational torque and the eccentricity amount based on the preset threshold value. As a method of comparison, for example, the construction management device 6 executes comparison between the reference pile information and the pile information, and the result of classifying the pile information into normal or abnormal is displayed on the monitor screen 6b. At this time, in the case of an abnormality, an alert may be displayed, for example, a sound may be emitted so that the operator can be surely recognized. In addition, for example, the operator may compare the reference pile information with the pile information.

If the operator determines that the rotation torque of the rotary pile 17 is normal from the displayed result or the comparison result, the measurement step S110 is performed or the construction is terminated after controlling the rotation torque of the rotary pile 17 to be reduced or the rotary pile to be reversed. In addition to the above, for example, the control step S120 may include a confirmation step S122 for confirming the state of the rotary pile 17 when it is determined from the comparison result that the abnormality is abnormal. In the confirmation step S122, for example, after stopping the rotation of the rotary pile 17, the state of the rotary pile 17 is confirmed.

<Reference pile information>
Next, an example of the reference pile information will be described with reference to FIGS. 8 to 11.

As shown in FIG. 8, for example, the reference pile information can be set based on the relationship between the rotational torque and the analysis result of the stress concentration portion in the rotary pile 17. In FIG. 8, as an example, a graph of the calculation result of the shear stress degree of the rotary pile 17 main body using pure torsion (Saint-Venant torsion) as a model is used, but in the case of bending torsion (warp torsion) as a model, for example. Can be used in the same manner. The conditions of the rotary pile 17 used in the calculation of FIG. 8 are a pile diameter of 800 mm, a blade diameter of 1200 mm, and a plate thickness of 11 mm. Based on reference pile information can be set.

For example, the reference pile information may be set using the upper limit value of the rotational torque (first upper limit value T1) with respect to the standard yield point based on the analysis result of the stress concentration portion. In addition, unlike T2 and T3 described later, T1 does not consider the axial force and the torsional strength due to the additional bending.

Further, the reference pile information may be set by using, for example, the upper limit value of the rotational torque (second upper limit value T2) in consideration of the value of the loading load. In this case, a standard yield point considering the torsional yield strength due to the axial force is used, and the second upper limit value T2 is set smaller than the first upper limit value T1 (the difference between T1 and T2 is the torsional yield strength due to the axial force). Equivalent to). That is, the construction can be carried out under the condition that the torsional strength due to the axial force is taken into consideration.

Further, the reference pile information may be set by using, for example, an upper limit value of torque (third upper limit value T3) in consideration of the fluctuation amount and the value of the loaded load. In this case, a standard yield point is used in consideration of the axial force and the torsional yield strength due to the additional bending, and the third upper limit value T3 is set smaller than the second upper limit value T2 (the difference between T2 and T3 is due to the additional bending). Corresponds to torsional strength). That is, the construction can be carried out under the conditions considering the axial force and the torsional strength due to the additional bending, and the damage of the rotary pile can be prevented more reliably. Therefore, it is most preferable to set the reference pile information using T3 among T1, T2, and T3.

Here, the reference pile information is set using the third upper limit value T3 in consideration of the above fluctuation amount and the load loading value, and the comparison step S121 using this reference pile information will be specifically described. Assuming that the third upper limit value T3 is the rotational torque Te, the rotational torque Te is expressed by the following equation (3).
Te = Zp × [√ {(T / Zp) ² + (ΔM / Z) ² } + N / A] ・ ・ ・ (3)
T: rotational torque, Zp: polar section modulus of the rotary pile body, ΔM: moment of inertia of area, Z: section modulus of the rotary pile body, N: axial force, A: cross-sectional area of the rotary pile body.
Further, the additional bending moment ΔM is expressed by the following equation (4).
ΔM = T / Dp × e ・ ・ ・ (4)
Dp: pile diameter, e: eccentricity.

Using these equations, for example, as shown in FIG. 9, the limit values of the rotational torque and the eccentricity amount according to the axial force based on the pile bearing capacity of the rotating pile are set. Then, in the comparison step S121, the normality or abnormality of the pile body is determined from the eccentricity estimated by the fluctuation amount measured in the measurement step S110 and the rotational torque.

For example, when the axial force is 120 kN, if the rotational torque and the eccentricity are within the range shown in FIG. 9A, it is determined to be "normal", and if it is out of the range, it is determined to be "abnormal". Then, when it is determined to be "abnormal", the rotational press-fitting condition is controlled so as to reduce the rotational torque or reverse the rotation. This operation changes the relationship between the ground and the pile, and as a result, the rotational torque and the amount of eccentricity can be reduced. When the rotational torque and the amount of eccentricity decrease and reach the "normal" range in FIG. 9, the intrusive rotation is performed again in the forward direction. If the relationship between the rotational torque and the amount of eccentricity goes to the "abnormal" range after penetrating in the forward rotation, the operation of reducing the rotational torque or reversing the rotation may be repeated as appropriate. Alternatively, the rotation may be stopped once, the situation may be judged, and a countermeasure may be considered.

As shown in FIG. 9, when the rotational torque is small, the rotary pile can be continuously press-fitted as "normal" until the eccentricity is relatively large. Further, when the amount of eccentricity is small, the rotary pile can be continuously press-fitted as "normal" until the rotational torque is relatively large. In this way, by controlling the rotational press-fitting condition from the relationship between the rotational torque and the amount of eccentricity, it is possible to prevent the rotating pile from being damaged, and the work efficiency is lowered without unnecessarily becoming a safe condition. It can be suppressed.

For example, a loading load may be further applied to the preset threshold value. In this case, the normality and abnormality of the pile body are judged from the relationship between the eccentricity amount, the rotational torque, and the loading load on the three-axis graph of the eccentricity amount, the rotational torque, and the loading load as shown in FIG. In addition to the amount of eccentricity and rotational torque, the load on the load is also added to the criteria for judgment. It is possible to prevent a decrease in work efficiency to a higher degree.

For example, when the axial force is 120 kN, if the rotational torque, the amount of eccentricity, and the loading load are within the range shown by "normal" in FIG. If it is (upper side of the surface that is the threshold value), it is judged as "abnormal". Then, when it is determined to be "abnormal", the rotational press-fitting condition is controlled so as to reduce the rotational torque, stop or reverse the rotation, or reduce the loading load. As shown in FIG. 10, for example, when the rotational torque is small, the rotary pile can be continuously press-fitted as "normal" until the eccentricity amount and the loading load are relatively large. Further, when the amount of eccentricity is small, it is possible to continue press-fitting the rotating pile as it is as "normal" until the rotation torque and the loading load are relatively large. Further, when the loading load is small, the rotary pile can be continuously press-fitted as it is as "normal" until the rotation torque and the eccentricity amount are relatively large. In this way, by controlling the rotational press-fitting conditions from the relationship between the rotational torque, the amount of eccentricity, and the loading load, it is possible to prevent the rotating pile from being damaged, and the work is not unnecessarily safe. It is possible to prevent the efficiency from decreasing.

In addition to the above, as the reference pile information, for example, as shown in FIG. 11, the permissible range of the penetration amount S per rotation of the rotary pile 17 with respect to the pitch P of the spiral blade 16 may be included. In this case, the penetration amount S per rotation is calculated by using the rotation angle included in the pile information measured by the measurement step S110 and the penetration amount. Then, the calculated penetration amount S per rotation is compared with the permissible range of the penetration amount S per rotation of the reference pile information, and the load N is controlled based on the comparison result. The intrusive amount S per rotation is calculated by the construction management device 6 or may be calculated by the operator.

For example, when the calculated intrusive amount S per rotation is larger than the intrusive amount S per rotation set in the reference pile information, the load N is reduced to obtain the next measured rotation angle. The intrusive amount S per rotation calculated by using the intrusive amount can be brought close to the intrusive amount S per rotation set in the reference pile information. As a result, for example, it is possible to efficiently carry out the construction without applying an unreasonable load on the spiral blade 16 and without disturbing the earth and sand at the tip of the rotary pile 17.

(Modification example of construction management system 100)
Next, a modified example of the construction management system 100 in this embodiment will be described with reference to FIG.

The difference between the construction management system 100 described above and the modified example is that the construction management device 6 can communicate with the management device 101 and the like. The description of the same configuration as the construction management system 100 described above will be omitted.

In the construction management system 100, the construction management device 6 may be connected to the management device 101, for example, to the server 103 via the communication line 102.

The management device 101 may be provided at a place away from the construction site, for example, and may be connected to a plurality of construction management devices 6 via, for example, a communication line 102. As the management device 101, for example, an electronic device such as a personal computer (PC), a tablet terminal, or a smartphone is used. The management device 101 may be connected to the interface box 8 and various measuring instruments 1 to 5 via, for example, a communication line 102.

The communication line 102 is an internet network or the like to which the construction management device 6 is connected via a communication circuit. The communication line 102 may be configured by optical fiber communication using a so-called optical fiber cable or the like. The communication line 102 may be realized by a known technique such as wired or wireless.

Various information such as measured pile information is stored in the server 103. By using the server 103, a huge amount of past data can be easily accumulated.

(Example of construction management device 6)
Next, an example of the construction management device 6 in this embodiment will be described with reference to FIG. The management device 101 described above may have the same configuration as at least a part of the construction management device 6.

FIG. 13A is a schematic diagram showing an example of the configuration of the construction management device 6. As the construction management device 6, an electronic device such as a personal computer is used. The construction management device 6 includes a housing 600, a CPU (Central Processing Unit) 601, a ROM (Read Only Memory) 602, a RAM (Random Access Memory) 603, a storage unit 604, and I / F 605 to 608. Be prepared. Each configuration 601 to 608 is connected by an internal bus 610.

The CPU 601 controls the entire construction management device 6. The ROM 602 stores the operation code of the CPU 601. The RAM 603 is a work area used during the operation of the CPU 601.

The storage unit 604 stores various information such as pile information and basic pile information. For example, reference pile information is stored in advance in the storage unit 604. As the storage unit 604, for example, a known storage medium such as an HDD (Hard Disk Drive) or SSD (Solid State Drive) is used.

The I / F 605 is an interface for transmitting and receiving various information to and from the interface box 8. The I / F 606 is an interface for receiving information input from the keyboard 6a. The operator can input or select various information or control commands of the construction management device 6 via the keyboard 6a. The I / F 607 is an interface for transmitting various information to the monitor screen 6b (display unit). The operator can recognize various information via the monitor screen 6b. As the monitor screen 6b, for example, a liquid crystal display is used. The I / F 608 is an interface for transmitting and receiving various information to and from the printer 6c and the communication line 102.

FIG. 13B is a schematic diagram showing an example of the function of the construction management device 6. The construction management device 6 includes an acquisition unit 611, a storage unit 612, and an output unit 613, and may include, for example, a comparison unit 614 and a generation unit 615. Each function shown in FIG. 13B is realized by the CPU 601 executing a program stored in the storage unit 604 or the like with the RAM 603 as a work area.

<Acquisition unit 611>
The acquisition unit 611 acquires pile information including the fluctuation amount. The acquisition unit 611 acquires the fluctuation amount measured by the fluctuation amount measuring device 1 via the interface box 8. The acquisition unit 611 may acquire the fluctuation amount by, for example, acquiring a value such as a distance measured by the fluctuation amount measuring device 1 and calculating the difference between the acquired value and the initial value acquired in advance. good.

In addition to the fluctuation amount, the acquisition unit 611 includes, for example, the rotation angle of the rotary pile 17 measured by various measuring instruments 2 to 5, the penetration amount of the rotary pile 17, and the rotational torque of the rotary pile 17, in addition to the fluctuation amount. And pile information including at least one of the loading loads of the rotary pile 17 may be acquired. The acquisition unit 611 may acquire N-value data acquired by, for example, the data input unit 9 or the keyboard 6a.

For example, the acquisition unit 611 may refer to the above equations (1) and (2) to calculate an eccentricity estimated from the measured fluctuation amount of the rotary pile 17 and include it in the pile information. In this case, for example, in the comparison unit 614 or the like, the threshold value et shown in FIG. 9 and the calculated eccentricity can be easily compared.

<Memory unit 612>
The storage unit 612 stores various information acquired by the acquisition unit 611 in the storage unit 604, and retrieves various information from the storage unit 604 as needed. The storage unit 612 stores, for example, the reference pile information or the like acquired in advance in the storage unit 604.

<Output unit 613>
The output unit 613 outputs various information such as pile information to the monitor screen 6b, the management device 101, and the like. The output unit 613 generates, for example, a construction record in which a plurality of pile information stored in the storage unit 604 is associated with each time or depth of the ground 91, and outputs the construction record to the monitor screen 6b or the like. Thereby, for example, the graph-shaped construction record as shown in FIG. 15 can be displayed on the monitor screen 6b. The graph of FIG. 15 is an example of a construction record in which the N value of the ground 91, the rotational torque of the rotary pile 17, the penetration amount of the rotary pile 17, and the loading load of the rotary pile 17 are plotted for each depth of the ground 91. Is shown. The output unit 613 may generate a construction record by using only a part of the pile information among the plurality of pile information, for example. The output unit 613 calculates the intrusive amount per rotation by using, for example, the angle of rotation and the intrusive amount, if necessary. For example, the fluctuation amount or the calculated eccentricity amount may be generated as a construction record and output to the monitor screen 6b.

<Comparison unit 614>
The comparison unit 614 compares the reference pile information with the pile information, classifies the pile information as normal or abnormal, and may classify the pile information into multiple stages (for example, 5 to 10 stages). In addition to comparing one pile information with the reference pile information, the comparison unit 614 may compare, for example, a plurality of pile information (for example, construction records) acquired periodically with the reference pile information. In this case, calculation results such as maximum, minimum, average, and variance of a plurality of pile information may be used as comparison targets.

<Generator 615>
When the comparison unit 614 classifies the pile information as an abnormality, the generation unit 615 generates notification information for notifying the operator of the abnormality. The generation unit 615 outputs the generated notification information to the monitor screen 6b via the output unit 613. As a result, the notification information is displayed on the monitor screen 6b, and it is possible to notify the operator of an abnormality in construction or the like.

(Example of operation of construction management system 100)
Next, an example of the operation of the construction management system 100 in this embodiment will be described with reference to FIG. FIG. 14 is a flowchart showing an example of the operation of the construction management system 100 in the present embodiment.

The construction management system 100 in the present embodiment includes the acquisition means S220 and the output means S230, and may include, for example, the measurement means S210 to be executed before the acquisition means S220. Since the construction management system 100 is used in the above-mentioned construction method of the rotary pile, the common contents will be omitted as appropriate.

<Measuring means S210>
The measuring means S210 measures pile information including the amount of fluctuation of the rotating pile 17 while the rotating pile 17 is rotationally press-fitted to the ground 91. The fluctuation amount measuring machine 1 measures the distance between the rotary pile 17 or the support plate 41 at an arbitrary cycle during the rotary press-fitting of the rotary pile 17, and measures the fluctuation amount.

In the measuring means S210, for example, while the rotary pile 17 is rotationally press-fitted, at least one of the rotation angle of the rotary pile 17, the penetration amount of the rotary pile 17, the rotational torque of the rotary pile 17, and the loading load of the rotary pile 17 is measured. You may. In this case, the rotation angle measuring machine 2 measures the rotation angle of the rotating pile 17, the penetration amount measuring machine 3 measures the penetration amount of the rotating pile 17, and the rotating torque measuring machine 4 measures the rotating torque of the rotating pile 17. , The loading load measuring machine 5 measures the loading load of the rotary pile 17. Each measurement may be executed at the same timing as, for example, the measurement of the fluctuation amount, or may be executed at a timing different from the fluctuation.

<Acquisition means S220>
The acquisition means S220 acquires pile information including the fluctuation amount of the rotary pile 17. The acquisition unit 611 of the construction management device 6 acquires the fluctuation amount measured by the fluctuation amount measuring device 1 via the interface box 8 and the I / F 605.

The acquisition unit 611 rotates the rotation angle of the rotary pile 17, the penetration amount of the rotary pile 17, the rotational torque of the rotary pile 17, and the rotation measured by the measuring instruments 2 to 5, for example, via the interface box 8 and the I / F 605. At least one of the loading loads of the pile 17 may be acquired. The acquisition unit 611 acquires the data including the above-mentioned fluctuation amount and the like as pile information, and stores the pile information in the storage unit 604 via, for example, the storage unit 612. As a result, the pile information acquired periodically is accumulated in the storage unit 604. The acquisition unit 611 may refer to the above equations (1) and (2), for example, calculate the eccentricity estimated from the acquired fluctuation amount of the rotary pile 17, and include it in the pile information.

<Output means S230>
The output means S230 outputs the pile information to the monitor screen 6b. The output unit 613 retrieves the accumulated pile information from the storage unit 604, for example, via the storage unit 612. The output unit 613 outputs the pile information to the monitor screen 6b via the I / F 607. As a result, the pile information is displayed on the monitor screen 6b, and the operator can confirm the pile information.

The output unit 613 may generate, for example, a construction record and output it to the monitor screen 6b. In this case, display conditions such as time and depth range and pitch can be set by the operator via, for example, the keyboard 6a, and can be appropriately set according to the construction situation. For example, when each of the measuring instruments 1 to 5 acquires data every second and the acquisition unit 611 acquires the pile information every second, the output unit 613 outputs the accumulated pile information every second. In addition, for example, a construction record showing pile information for a depth of every 10 seconds or 1 m may be generated and output.

The output unit 613 may output the pile information to the management device 101 or the server 103 via, for example, the I / F 608 and the communication line 102. In this case, the output unit 613 may output the pile information each time the acquisition unit 611 acquires the pile information, or may output the pile information accumulated in a set arbitrary period at once.

As a result, the operation of the construction management system 100 in the present embodiment is completed. As shown in FIG. 14A, after the acquisition means S220 or the output means S230 is executed, the measuring means S210 is executed again to monitor the state of the rotary pile 17 during the rotary press-fitting of the rotary pile 17. be able to.

The construction management system 100 may include at least one of the comparison means S240 and the notification means S250, for example, as shown in FIG. 14 (b). In the comparison means S240, the comparison unit 614 compares the reference pile information with the pile information. As a method of comparison, for example, a known technique such as comparing the magnitude of the value of the reference pile information and the value of the pile information can be used. For example, the comparison unit 614 classifies it as normal when the value of the pile information is equal to or less than the value of the reference pile information, and classifies it as abnormal when the value of the pile information exceeds the value of the reference pile information. The classification criteria can be set arbitrarily.

As a result of comparison, when the pile information is classified as normal, the measuring means S210 or the output means S230 is executed or the operation is terminated. On the other hand, when the pile information is classified as abnormal, the notification means S250 is executed. In the notification means S250, the generation unit 615 generates notification information for notifying the operator of the abnormality. The generation unit 615 outputs the notification information to the monitor screen 6b via the output unit 613 and the I / F 607, and also outputs the notification information to the management device 101 via, for example, the output unit 613, the I / F 608 and the communication line 102. It may be output.

As the notification information, for example, information for displaying an abnormality on the monitor screen 6b may be included, and information for emitting a sound may be included. This makes it possible to smoothly notify the operator of the abnormality.

According to the method of constructing the rotary pile in the present embodiment, the measurement step S110 measures the pile information including the fluctuation amount of the rotary pile 17 while the rotary pile 17 is rotationally press-fitted to the ground 91. Therefore, the operator can estimate the state of the rotary pile 17 during the rotary press-fitting based on the fluctuation amount. This makes it possible to prevent the rotary pile 17 from being damaged.

Further, according to the method of constructing the rotary pile in the present embodiment, in the measurement step S110, the amount of movement of the rotary pile 17 in the horizontal plane from the initial setting position and the relative inclination amount of the casing driver 21 and the rotary pile 17 are measured. At least one is measured as a fluctuation amount. Therefore, the amount of fluctuation can be measured without making a significant change from the conventional construction method. This makes it possible to easily measure the amount of fluctuation.

Further, according to the method of constructing the rotary pile in the present embodiment, the measurement step S110 measures the amount of misalignment of the support plate 41 as the amount of fluctuation. Therefore, as compared with the case where the fluctuation amount of the rotary pile 17 is directly measured, it is possible to suppress the variation of the measured value due to the rotation of the rotary pile 17. This makes it possible to measure the amount of fluctuation with high accuracy.

Further, according to the method of constructing a rotary pile in the present embodiment, the pile information includes at least one of the penetration amount of the rotary pile 17, the rotational torque of the rotary pile 17, and the loading load of the rotary pile 17. Therefore, the operator can estimate the state of the rotary pile 17 after combining the fluctuation amount of the rotary pile 17 and the rotary press-fitting condition. This makes it possible to prevent the rotating pile 17 from being damaged from various viewpoints.

Further, according to the method of constructing a rotary pile in the present embodiment, the comparison step S121 compares the reference information with the pile information and determines whether it is normal or abnormal. Therefore, it is possible to suppress variations in the subjective judgment criteria for each worker. As a result, it is possible to prevent the rotating pile 17 from being damaged regardless of the work proficiency of the operator or the like.

Further, according to the method of constructing a rotary pile in the present embodiment, the comparison step S121 determines normality or abnormality based on a preset threshold value et from the relationship between the rotary torque Te and the eccentricity amount. Therefore, it is possible to make a judgment using the optimum threshold value according to the construction situation. This makes it possible to prevent damage to the rotating pile in response to changes in construction conditions.

Further, according to the method of constructing the rotary pile in the present embodiment, the control step S120 reduces or reverses the rotary torque of the rotary pile 17 based on a preset threshold value et from the relationship between the rotary torque Te and the eccentricity amount. To control. Therefore, it is possible to control the conditions for rotational press-fitting of the rotary pile 17 before the abnormality of the rotary pile 17 occurs. As a result, the possibility of damage to the rotary pile 17 can be suppressed and the construction can proceed.

According to the rotary pile 17 in the present embodiment, the rotary pile 17 is penetrated to the support layer 92 of the ground 91 by the above-mentioned construction method of the rotary pile. Therefore, it is possible to realize the rotary pile 17 constructed in a state where damage is prevented.

According to the construction management device 6 for the rotary pile in the present embodiment, the acquisition unit 611 acquires the pile information including the fluctuation amount of the rotary pile 17 measured while the rotary pile 17 is rotationally press-fitted to the ground 91. .. Further, the display unit (monitor screen 6b) displays pile information. That is, the operator can confirm the amount of fluctuation that causes the rotary pile 17 to be damaged via the monitor screen 6b. Therefore, the operator can estimate the state of the rotating pile 17 based on the fluctuation amount. This makes it possible to prevent the rotary pile 17 from being damaged.

Further, according to the construction management device 6 for rotating piles in the present embodiment, the generation unit 615 generates notification information when the comparison unit 614 classifies the pile information as abnormal. Therefore, by displaying an alert on the monitor screen 6b or the like based on the notification information, it is possible to notify the operator that the possibility of damage to the rotating pile 17 has increased. As a result, the operator does not need to constantly monitor the pile information via the monitor screen 6b or the like, and the workability can be improved. In addition, it is possible to suppress variations in subjective judgment criteria for each worker. This makes it possible to prevent the rotating pile 17 from being damaged regardless of the work proficiency of the operator or the like.

According to the construction management system 100 for the rotary pile in the present embodiment, the acquisition means S220 acquires the pile information including the fluctuation amount of the rotary pile 17 measured while the rotary pile 17 is rotationally press-fitted to the ground 91. .. That is, the amount of fluctuation that causes damage to the rotary pile 17 can be notified to the operator, the work manager, or the like via the display unit (monitor screen 6b) or the like. Therefore, the worker, the work manager, and the like can estimate the state of the rotary pile 17 based on the fluctuation amount. This makes it possible to prevent the rotary pile 17 from being damaged.

Although the examples of the embodiments of the present invention have been described in detail above, all of the above-described embodiments are merely examples of the embodiment of the present invention, and the technical aspects of the present invention are thereby used. The scope should not be construed in a limited way.

1: Fluctuation amount measuring machine 2: Rotation angle measuring machine 2a: Magnetic reaction proximity switch 2b: Metal piece 3: Penetration amount measuring machine 3a: Wire rope 3b: Encoder 3c: Stroke sensor 4: Rotation torque measuring machine 4a: Auger current meter 5: Load measuring machine 5a: Load cell 6: Construction management device 6a: Keyboard 6b: Monitor screen 6c: Printer 7: Data converter 8: Interface box 9: Data input unit 10: Pile driver reader 11: Infinite orbital body 12 : Swing support base 13: Pile driver main body 14: Tilt support arm 15: Auger machine 15a: Main body 15b: Non-rotating frame material 15c: Rotating body 16: Spiral blade 17: Rotating pile 19: Driver's cab 21: Casing driver 21a : Crane crane 21b: Reaction force bar 22: Swing ring 23: Hydraulic motor 24: Press-fit hydraulic jack 24a: Cylinder 25: Grip part 26: Pedestal 27: Non-rotating frame material 28: Gear mechanism 29: Bearing mechanism 30: Handle 41 : Support plate 91: Ground 92: Support layer 100: Construction management system 101: Management device 102: Communication line 103: Server 600: Housing 601: CPU
602: ROM
603: RAM
604: Preservation unit 605: I / F
606: I / F
607: I / F
608: I / F
610: Internal bus 611: Acquisition unit 612: Storage unit 613: Output unit 614: Comparison unit 615: Generation unit S100: Rotational press-fitting process S110: Measurement process S120: Control process S121: Comparison process S122: Confirmation process S210: Measuring means S220 : Acquisition means S230: Output means S240: Comparison means S250: Notification means X: Pile axis orthogonal direction W: Pile circumferential direction Z: Pile axis direction

Claims (9)

It is a construction method that penetrates a rotating pile with blades into the ground.
A measurement step of measuring pile information including the amount of fluctuation of the rotary pile and the rotational torque of the rotary pile while the rotary pile is rotationally press-fitted to the ground.
A comparison step of determining normality or abnormality of the pile body from the relationship between the rotational torque and the amount of eccentricity based on a preset threshold value.
A control process that controls the conditions for rotational press-fitting of the rotary pile based on the pile information,
Equipped with
The control step is a method for constructing a rotary pile, characterized in that the rotational torque of the rotary pile is reduced, or the rotation is stopped or reversed based on the result of the comparison step. In the measurement step, at least one of the amount of movement in the horizontal plane from the initial installation position of the rotary pile and the relative tilt amount between the casing driver holding the rotary pile and the rotary pile is measured as the fluctuation amount. The method for constructing a rotary pile according to claim 1. The method for constructing a rotary pile according to claim 2, wherein the measurement step measures the amount of misalignment of the support plate sandwiched between the ground and the casing driver as the fluctuation amount. The method for constructing a rotary pile according to any one of claims 1 to 3, wherein the pile information further includes at least one of the penetration amount of the rotary pile and the loading load of the rotary pile. The control step is characterized by having a comparison step of comparing the reference pile information regarding the condition of the rotary press-fitting of the rotary pile set in advance with the pile information and determining normality or abnormality. The method for constructing a rotary pile according to any one of 4. A method for manufacturing a pile group, which comprises manufacturing a pile group including a plurality of rotary piles penetrating to the support layer of the ground by the method for constructing a rotary pile according to any one of claims 1 to 5. A construction management device used to penetrate a rotating pile with blades into the ground.
An acquisition unit that acquires pile information measured while the rotary pile is rotationally press-fitted to the ground, and an acquisition unit.
A storage unit that stores the pile information and
A display unit that displays the pile information and
Equipped with
The pile information includes the fluctuation amount of the rotary pile and the rotational torque of the rotary pile.
Based on the preset threshold, the normality or abnormality of the pile body is judged from the relationship between the rotational torque and the eccentricity amount, and based on the result, the rotational torque of the rotary pile is reduced, or the rotation is stopped or reversed. A rotary pile construction management device characterized by being able to be controlled. A comparison unit that compares the reference pile information regarding the conditions for rotational press-fitting of the rotary pile with the pile information and classifies them as normal or abnormal.
When the comparison unit classifies the pile information as an abnormality, a generation unit that generates notification information for notifying the operator of the abnormality, and a generation unit.
Further prepare
The construction management device for a rotary pile according to claim 7 , wherein the reference pile information is stored in advance in the storage unit. A construction management system used to penetrate a rotating pile with blades into the ground.
An acquisition means for acquiring pile information measured during rotational press-fitting of the rotary pile with respect to the ground.
A storage unit that stores the pile information and
An output means for outputting the pile information and
Equipped with
The pile information includes the fluctuation amount of the rotary pile and the rotational torque of the rotary pile.
Based on the preset threshold, the normality or abnormality of the pile body is judged from the relationship between the rotational torque and the eccentricity amount, and based on the result, the rotational torque of the rotary pile is reduced, or the rotation is stopped or reversed. A rotating pile construction management system characterized by being able to be controlled.

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