JP7127780B2 - Diameter expansion amount management device, diameter expansion amount management system, and diameter expansion amount management method - Google Patents

Description

Article 30, paragraph 2 of the Patent Act applies. Disclosed in the Construction Technology Examination and Certification Project (Housing, etc. Related Technology) Report issued on January 24, 2019.

TECHNICAL FIELD The present invention relates to a diameter expansion amount management device, a diameter expansion amount management system, and a diameter expansion amount management method.

As a method of strengthening the bearing capacity of cast-in-place piles, there is a method of forming an enlarged diameter portion on the shaft of the pile. With this expanded diameter portion, it is possible to increase the pull-out resistance of the pile in addition to increasing the bearing capacity of the pile. Therefore, a pile having an enlarged diameter portion is suitable as a foundation pile for a high-rise building, a super-high-rise building, a high-rise tower, or the like, which has a large aspect ratio, a prominent overturning moment, and can pose a problem of pull-out force.
The above-mentioned enlarged diameter portion includes an enlarged bottom portion at the bottom of the shaft portion of the pile and an intermediate enlarged diameter portion located in the middle of the shaft portion of the pile. There is a diameter expansion pile that has a shape that has an expanded diameter, and a diameter expanded pile that has both a bottom expanded portion and an intermediate diameter expanded portion.
In forming the pile hole of the enlarged diameter pile having the enlarged bottom portion (a pile hole for the enlarged diameter pile, having a pile hole for the shaft portion and a pile hole for the enlarged bottom portion), especially for the enlarged bottom portion The pile hole is formed by rotating an expansion blade, which is a component of a diameter expansion bucket (mechanical diameter expansion bucket) of the diameter expansion section pile hole excavator, in an open state. The mechanical diameter expanding bucket is rotated in accordance with the rotation of the kelly bar, and includes a tubular body, a shaft sliding inside the tubular body and fixed to the kelly bar, for example, directly or indirectly, and a shaft. and an enlarged wing to which the tip of an arm extending from the body is attached. When the kelly bar moves or extends downward, the shaft that is directly fixed to the kelly bar, for example, slides inside the tubular body, and the sliding of the shaft opens the expanding wings. there is
The accuracy of the finished shape of the enlarged bottom pile hole is determined by the diameter expansion amount (or diameter expansion stroke amount) when the diameter expansion blade shifts from the initial closed position to the open position.

Here, in foundation pile construction in which a foot protection bulb (equivalent to the expanded bottom part described above) is built in the middle or lower part of the excavated hole for the foundation pile, the shape of the built foot protection bulb is accurately confirmed. A system for confirming the shape of a hardening bulb in foundation pile construction has been proposed. Specifically, the expansion wing change measurement storage means attached to the excavation jig directly measures and stores the change over time in the expansion/reduction state of the expansion wing, and the directly measured expansion of the expansion wing is stored. In foundation pile construction, the shape of the foot protection bulb is detected by integrating the temporal change of the diameter/diameter reduction state and the temporal change of the depth of the expansion wing measured by the expansion wing depth measurement storage means. This is a system for confirming the shape of a hardening bulb (see, for example, Patent Document 1).

JP 2009-41315 A

In the shape confirmation system described in Patent Document 1, the expansion wing change measurement storage means attached to the excavation jig directly measures the change over time in the expansion/reduction state of the expansion wing. It is undeniable that excavated soil generated by excavation falls on the expanded wing change measurement storage means, which affects the measurement to some extent. Further, the expansion wing change measurement storage means includes an expansion wing change detection sensor, and a memory for storing the expansion/reduction state measured by the expansion wing change detection sensor and the measurement time. Since the system is formed by a recording computer with a change detection sensor, the production cost of the system can be expensive due to the system including such a computer.

The present invention has been made in view of the above problems, and the measurement of the diameter expansion amount of the diameter expansion blade of the mechanical diameter expansion bucket is not affected by the excavated soil and sand, and the diameter expansion amount is accurate. It is an object of the present invention to provide a device for managing the amount of expansion, a system for managing the amount of expansion, and a method for managing the amount of expansion.

In order to achieve the above object, one aspect of the diameter expansion amount management device according to the present invention is
Applied when constructing an enlarged diameter pile having a shaft portion and an enlarged diameter portion, using a prepared pile hole for the shaft portion to create a pile hole for the enlarged diameter portion with a pile hole excavator for the enlarged diameter portion A diameter expansion amount management device,
The pile hole excavator for the diameter expansion section has a mechanical diameter expansion bucket attached to the tip of a rotating kelly bar, and the mechanical diameter expansion bucket slides inside a tubular body and the tubular body. a shaft that moves and is fixed directly or indirectly to the Kerry bar;
The diameter expansion amount management device has a wire, a motor that automatically winds the wire, and a measuring device that measures the wire feed amount associated with the diameter expansion amount of the diameter expansion blade,
One end of the wire is attached to the shaft, and the wire is sent out when the diameter-enlarging wings are opened by sliding of the shaft,
The wire is automatically wound by the motor when one end of the wire is removed from the shaft.

According to this aspect, one end of the wire is attached to the shaft for opening and closing the diameter-expansion blades, and the wire is sent out when the diameter-expansion blades are opened by sliding of the shaft, and is associated with the diameter expansion amount of the diameter-expansion blades. By measuring the wire feed amount with a measuring device for measuring the wire feed amount and specifying the diameter expansion amount of the diameter expansion blade, the diameter expansion amount of the diameter expansion blade of the mechanical diameter expansion bucket is determined. The measurement of the amount is not affected by the excavated earth and sand, and it is possible to achieve accurate diameter expansion amount management. In addition, as described in Patent Document 1, since it is not provided with an expensive expansion wing change measurement storage means formed by a recording computer with an expansion wing change detection sensor, the manufacturing cost can be kept as low as possible. The device can be manufactured by

Here, "a shaft directly or indirectly fixed to a kelly bar" means a form in which a shaft that slides inside a cylindrical main body that constitutes a mechanical diameter expanding bucket is directly fixed to a kelly bar; It is meant to include forms that are indirectly fixed to the keliba. The form in which the shaft is directly fixed to the kelly bar is a form in which there is no hydraulic mechanism between the shaft and the kelly bar. The diameter-expanding excavation can be performed by allowing the mechanical diameter-expanding bucket to land on the bottom and opening the diameter-expanding wings of the mechanical diameter-expanding bucket by applying a reaction force to the bottom ground. On the other hand, the form in which the shaft is indirectly fixed to the kelly bar is a form in which a hydraulic mechanism exists between the shaft and the kelly bar. , and when the shaft body is pushed by the piston rod, the diameter-expanding blades are opened to perform diameter-expanding excavation. For example, when forming an intermediate enlarged diameter pile hole in the middle of the shaft pile hole, the ground reaction force cannot be taken by letting the mechanical diameter expansion bucket land on the bottom of the shaft pile hole. Therefore, it becomes possible to open the radial expansion wings by operating the hydraulic jack.
In this way, even if a mechanical diameter expansion bucket with a hydraulic mechanism or a mechanical diameter expansion bucket without a hydraulic mechanism is applied, the diameter expansion wings of the mechanical diameter expansion bucket When managing the diameter expansion amount, the diameter expansion amount management device of this aspect can be applied.

In addition, the "wire feeding amount associated with the diameter expansion amount of the diameter expansion wing" refers to the diameter expansion amount of the diameter expansion wing (for example, when the diameter expansion wing is opened in a This means that the relation (relevant data) between the radius in plan view in the state, and the radius in plan view differs depending on the opening degree of the diameter-expanding blade) and the feed amount of the wire is specified in advance. For example, when the diameter expansion amount of the expansion blade is Δm, ▽m, and ×m, the wire feeding amount is 〇m, ◎m, and □m, respectively. The relationship between the diameter expansion amount and the wire feeding amount at the diameter expansion amount for each opening is specified.
In addition, since the wire is automatically wound by the motor, when the measurement is completed and one end of the wire is removed from the shaft, the wire is automatically wound by the motor. The entire measurement work, including the

Further, in another aspect of the diameter expansion amount management device according to the present invention, the pile hole excavator for the diameter expansion portion has a turntable that rotates in synchronization with the kelly bar,
The diameter expansion amount management device is mounted on the turntable.

According to this aspect, the pile hole excavator for the diameter expansion part is placed on the turntable that rotates in synchronization with the kelly bar (and the mechanical diameter expansion bucket including the shaft), so that the mechanical diameter expansion A wire, one end of which is attached to a shaft, which is a component of the bucket, is prevented from winding around a kelly bar or the like in a rotating posture. This turntable is equipped with a plurality of reels for winding hydraulic hoses and electric control cables. In order to obtain this effect even with a wire whose one end is attached to the shaft, mounting on the turntable is applied.

In addition, one aspect of the diameter expansion amount management system according to the present invention is
A diameter expansion amount management system including the diameter expansion amount management device and a mobile terminal,
The mobile terminal is
a storage unit that stores data related to the amount of feed of the wire and the amount of diameter expansion of the diameter expansion blade;
a receiving unit that receives measurement data about the amount of feed of the wire by the measuring device;
and a display section for displaying both the related data and the measurement data.

According to this aspect, the measurement data captured by the measuring device of the diameter expansion amount management device is transmitted to the mobile terminal provided by the administrator or the operator of the excavator, etc., and the display unit of the mobile terminal displays the wire Since the data related to the feed amount and the expansion amount of the expansion blade and the measurement data are displayed at the same time, the administrator can check the expansion amount from the time the expansion blade starts to open until it is completely opened. Expanding excavation can be performed while checking at any time. Therefore, for example, when it is confirmed that the widening wing is not opened to the desired opening (for example, 100%), it is instantly determined that the prepared pile hole for the enlarged diameter portion does not satisfy the designed finished shape. can be identified. In such a case, the mechanical expansion bucket should be evacuated outside the tunnel for maintenance, etc., and then the pile hole for the expanded diameter portion should be created again to satisfy the design result. becomes possible to create. Mobile terminals include smartphones, tablets, personal computers, and the like.

Further, one aspect of the diameter expansion amount management method according to the present invention is
Applied when constructing an enlarged diameter pile having a shaft portion and an enlarged diameter portion, using a prepared pile hole for the shaft portion to create a pile hole for the enlarged diameter portion with a pile hole excavator for the enlarged diameter portion A diameter expansion amount management method,
The pile hole excavator for the diameter expansion section has a mechanical diameter expansion bucket attached to the tip of a rotating kelly bar, and the mechanical diameter expansion bucket slides inside a tubular body and the tubular body. a shaft that moves and is fixed directly or indirectly to the Kerry bar;
A step of attaching one end of the wire to the shaft using the diameter expansion amount management system;
a step of measuring a feed amount of the wire when the radial expansion blade opens due to sliding of the shaft;
and managing the amount of diameter expansion based on data related to the amount of feed of the wire and the amount of diameter expansion of the diameter expansion blade.

According to this aspect, by managing the expansion amount using the expansion amount management system according to the present invention, the administrator or the like can control the expansion amount from when the widened wings start to open until, for example, when they are completely opened. Expanding excavation can be performed while checking at any time.

Another aspect of the diameter expansion amount management method according to the present invention is
Applied when constructing an enlarged diameter pile having a shaft portion and an enlarged diameter portion, using a prepared pile hole for the shaft portion to create a pile hole for the enlarged diameter portion with a pile hole excavator for the enlarged diameter portion A diameter expansion amount management method,
The pile hole excavator for the diameter expansion part has a mechanical diameter expansion bucket attached to the tip of a rotating kelly bar, and a turntable that rotates in synchronization with the kelly bar, and the mechanical diameter expansion bucket A tubular body, a shaft that slides inside the tubular body and is directly or indirectly fixed to the kelly bar, and a diameter-expanding wing to which the tip of an arm that extends from the shaft is attached. and
A reel wound with a wire is placed on the turntable, one end of the wire is attached to the shaft, and the mechanical diameter-expanding bucket is positioned at a predetermined depth in the pile hole for the shaft in a closed posture. a step of marking an initial value on a position of the wire corresponding to the reference level while
The wire is sent out when the radially expanding wings are opened by sliding of the shaft, and the distance between the initial value marking provided on the sent wire and the reference level is measured to obtain a measurement value. and managing the amount of diameter expansion while comparing data related to the amount of diameter expansion of the diameter expansion blades and the feed amount of the wire with the measured values.

According to this aspect, without using a special device or system, a manager, a worker, or the like measures the distance between the initial value marking provided on the wire to be sent out and the reference level to obtain the measured value. , the amount of diameter expansion can be managed while comparing data and measured values relating to the amount of diameter expansion of the diameter expansion blade and the feed amount of the wire.

According to the diameter expansion amount management device, the diameter expansion amount management system, and the diameter expansion amount management method of the present invention, the measurement of the diameter expansion amount of the diameter expansion blade of the mechanical diameter expansion bucket is affected by excavated soil. Accurate diameter expansion amount management can be realized without receiving

1 is a diagram showing an example of the overall configuration of a diameter expansion amount management system according to an embodiment, and an example of a pile hole excavator for diameter expansion portion in which the diameter expansion amount management system is mounted; FIG. FIG. 4 is a side view of an example of a mechanical diameter-expansion bucket having a hydraulic mechanism, showing a state in which diameter-expansion wings are in a closed position; FIG. 4 is a side view of an example of a mechanical diameter-expansion bucket having a hydraulic mechanism, showing a state in which diameter-expansion wings are in an open position; FIG. 3 is a plan view of diameter-expansion blades, in which (a) is a diagram showing the diameter-expansion blades in a closed posture, and (b) is a diagram showing the diameter-expansion blades in an open posture. Both (a) and (b) are diagrams showing an example of a formed pile hole for an enlarged diameter portion. It is a front view which shows the external appearance of the diameter expansion amount management apparatus which concerns on embodiment. It is a perspective view which shows the internal structure of the diameter expansion amount management apparatus which concerns on embodiment. FIG. 5 is a diagram for explaining the action of the counterweight when feeding out the wire; It is a figure which shows an example of the hardware constitutions of the controller which the diameter expansion amount management apparatus which concerns on embodiment has. It is a figure which shows an example of the hardware constitutions of the portable terminal which the diameter-expansion amount management system which concerns on embodiment has. It is a figure which shows an example of a functional structure of a portable terminal. 4 is a flowchart showing a diameter expansion amount management method according to the first embodiment; 9 is a flow chart showing a diameter expansion amount management method according to the second embodiment. It is a figure explaining the diameter expansion amount management method which concerns on 2nd Embodiment.

Hereinafter, a diameter expansion amount management device, a diameter expansion amount management system, and a diameter expansion amount management method according to embodiments will be described with reference to the accompanying drawings. In addition, in the present specification and drawings, substantially the same components may be denoted by the same reference numerals, thereby omitting duplicate descriptions.

[Overall configuration of diameter expansion amount management system and pile hole excavator for diameter expansion part]
First, with reference to FIG. 1, an example of the overall configuration of a diameter expansion amount management system and a pile hole excavator for diameter expansion portion according to an embodiment will be described. Here, FIG. 1 is a diagram showing an example of the overall configuration of the diameter expansion amount management system according to the embodiment, and an example of a pile hole excavator for diameter expansion portion equipped with the diameter expansion amount management system.

As shown in FIG. 1 , the diameter expansion amount management system 500 includes a diameter expansion amount management device 200 and a mobile terminal 300 . The diameter expansion amount management device 200 and the portable terminal 300 can communicate via a network 400 represented by the Internet, a LAN (Local Area Network), or the like. The measurement data regarding the diameter expansion amount of the diameter expansion blade acquired by the diameter expansion amount management device 200 is transmitted to the portable terminal 300 via the network 400 .

The portable terminal 300 is placed in the operator's seat of the base machine 10 that forms the pile hole excavator 100 for the enlarged diameter part, and the operator receives measurement data related to the diameter expansion amount transmitted to the portable terminal 300 from the operator's seat. It is possible to perform diameter-expanding excavation by expanding and rotating the diameter-expanding blade while confirming with . Here, the mobile terminal 300 is formed by a smart phone, a tablet, or a personal computer. The portable terminal 300 may be carried by a construction manager at a construction site or a management building, or may be carried by both the operator of the base machine 10 and the construction manager.

Next, with reference to FIG. 1, an example of a pile hole excavator for an enlarged diameter portion will be described. The enlarged-diameter portion pile hole excavator shown in FIG. 1 is an excavator used for creating an intermediate enlarged-diameter portion pile hole that is formed in the middle of a shaft portion pile hole.

The pile hole excavator 100 for expanding diameter includes a base machine 10 forming an earth drill excavator, a boom 11, a support beam 12, a rotation drive unit 13 supported by the support beam, and a rotation drive unit 13 and a mechanical diameter-expanding bucket 80 having a hydraulic mechanism attached to the tip of the kelly bar 20 . The base machine 10 rotatably supports the lower end of a boom 11 extending obliquely upward. Here, the wire 16 can be made of various materials such as metal wires such as steel wires and stainless steel wires, wires made of relatively hard resin, and string-like wires made by twisting ceramic fibers or threads. . Also, the wire 16 may be provided with a scale. The kelly bar 20 is vertically movable by winding or unwinding the wire 16 by a drum (not shown) provided on the side of the base machine 10 . A turntable 15 on which a plurality of reels 14 are mounted for winding hydraulic hoses, electric control cables (none of which are shown), and the like is provided near the lower side of the rotation drive unit 13 . The turntable 15 rotates in synchronism with the kelly bar 20, so that the rotating kelly bar 20 is prevented from being wound around by hydraulic hoses and electric control cables.

A diameter expansion amount management device 200 is further mounted on the turntable 15. A wire 210 extends downward from the diameter expansion amount management device 200, and one end of the wire 210 is connected to a mechanical diameter expansion bucket 80 described in detail below. is attached to a shaft body 73 that constitutes the Since the diameter expansion amount management device 200 is also placed on the turntable 15 in this way, the winding of the wire 210 around the rotating kelly bar 20 is suppressed.

As the shaft body 73 that constitutes the mechanical diameter-expanding bucket 80 slides downward, the diameter-expansion wings 76 indirectly connected to the shaft body 73 are gradually opened. At this time, the wire 210 is gradually sent out from the diameter expansion amount management device 200 according to the sliding of the shaft 73, and the diameter expansion amount management device 200 measures the amount of this feeding. Then, measurement data regarding the feed amount of the wire 210 is transmitted to the mobile terminal 300 . In the portable terminal 300, data related to the feed amount of the wire 210 and the diameter expansion amount of the diameter expansion blades are stored therein, and both the related data and the received measurement data are displayed. . The operator or construction manager can manage the diameter expansion amount of the diameter expansion wing at any time by referring to both of the displayed data.

[Mechanical expanding bucket with hydraulic mechanism]
Next, with reference to FIGS. 2 to 4, an example of a mechanical diameter-expanding bucket equipped with a hydraulic mechanism will be described, and with reference to FIG. do. Here, FIGS. 2 and 3 are side views of an example of a mechanical diameter-expansion bucket equipped with a hydraulic mechanism, showing a state in which the diameter-expansion blades are in a closed posture, and a diagram showing a state in which the diameter-expansion blades are in an open posture. It is a figure which shows a state. 4A and 4B are plan views of the diameter expansion blades, FIG. 4A is a diagram showing the diameter expansion blades in the closed posture, and FIG. 4B is a diagram showing the diameter expansion blades in the open posture. be. Furthermore, both FIGS. 5(a) and 5(b) are diagrams showing an example of a pile hole for an enlarged diameter portion to be created.

A mechanical diameter-expanding bucket 80 equipped with a hydraulic mechanism has an inner pipe 30, a hydraulic jack 60 (an example of a hydraulic mechanism), an outer pipe 40, a mechanical diameter-expanding bucket 70, and a load transmission body 50. Both are formed of steel structural members. The inner tube 30 includes a first upper cover 31 and a first cylindrical body 32 which are circular in plan view, and the lower end of the keliver 20 is fixed to the upper surface of the first upper cover 31 by bolting or welding.

The hydraulic jack 60 includes a cylinder 61 and a piston rod 62 that slides within the cylinder 61. The cylinder 61 is fixed to the lower surface 31b of the first upper cover 31 by bolting or welding. The outer tube 40 includes a lower lid 41 and a second cylindrical body 42 , which are circular in plan view. The piston rod 62 is fixed to 41a by bolting or welding.

The mechanical diameter expanding bucket 70 has a cylindrical outer body 71 , a cylindrical inner body 72 (an example of a cylindrical body) disposed inside the outer body 71 , and slides inside the inner body 72 . , an arm 74 attached to the shaft 73 , and an enlarged diameter wing 76 attached to the tip of the arm 74 . As shown in FIG. 3, the inner main body 72 has a guide groove 75 formed in a direction (inclination angle θ1) inclined with respect to the axial direction L1. is guided to form the closed posture (see FIG. 2) and the open posture (see FIG. 3) of the enlarged diameter wing 76. As shown in FIG. The shaft 73 of the mechanical diameter-expanding bucket 70 is fixed to the lower surface 41b of the lower lid 41 of the outer tube 40 by bolting or welding. Furthermore, a conical lid portion 78 is attached to the lower end of the outer body 71 so as to be openable and closable. By opening the lid portion 78, the excavated soil stored inside the outer body 71 is carried out. .

The load transmission body 50 includes a second upper lid 51 and a third cylindrical body 52 which are circular in plan view. The second upper lid 51 is placed on the upper surface 31a of the first upper lid 31 of the inner pipe 30 via the rollers 35, and the third cylinder 52 is arranged around the outer circumferences of the first cylinder 32 and the second cylinder 42. is set. In addition, a stabilizer 85 that controls the attitude of the mechanical diameter-expansion bucket 70 in the pile hole is disposed on the upper portion of the mechanical diameter-expansion bucket 70 , and the third cylindrical body 52 is connected via the connection member 54 . It is fixed to stabilizer 85 .

As shown in FIG. 3, on the outer periphery of the first cylindrical body 32 of the inner tube 30, an engaging projection 33 extending in the axial direction L1 of the first cylindrical body 32 extends in the circumferential direction of the first cylindrical body 32. A plurality of engaged projections 43 are provided at intervals, and on the inner circumference of the second cylindrical body 42 of the outer tube 40, a plurality of engaged projections 43 extending in the axial direction L1 of the second cylindrical body 42 are provided. It is The inner tube 30 rotates in the Y2 direction due to the rotational torque when the kelly bar 20 rotates in the Y1 direction, and the outer tube 40 is engaged with the inner tube 30 by engaging the engaging protrusions 33 and the engaged protrusions 43. and rotate in the Y3 direction. Further, when the outer tube 40 rotates, the shaft 73 fixed to the outer tube 40 rotates, and the entire mechanical diameter expanding bucket 70 having the shaft 73 as a component rotates in the Y4 direction.

The shaft 73 is engaged with a key 74a extending in a direction orthogonal to the longitudinal direction thereof and passing through the shaft 73. The key 74a further passes through a guide groove 75 of the inner main body 72, End covers 74b are attached to both ends of 74a. Furthermore, a universal joint 74c is attached to the end cover 74b, and a connecting member 74d is attached to the universal joint 74c. As shown in FIG. 3, the mechanical diameter-expanding bucket 70 has two diameter-expanding wings 76, and the leading ends of connecting members 74d extending in two directions are rotatable with respect to the respective diameter-expanding wings 76. attached to the

As shown in FIG. 4(a), which is a plan view of the two diameter expansion blades 76 in the closed position shown in FIG. In the state of the closed posture, the tip of each diameter-enlarging wing 76 is engaged with the wing stopper 77, and the diameter-enlarging wing 76 is restricted from rotating further inward than in the illustrated state.

On the other hand, as shown in FIG. 4B, which is a plan view of the two expanded diameter wings 76 in the open position shown in FIG. By rotating each diameter expansion blade 76 in the Y4 direction, the excavated soil D is effectively scooped up by the diameter expansion blade 76 having an arc shape in plan view, and conveyed in the rotation direction of the diameter expansion blade 76. be done.

Further, as shown in FIG. 4(b), the expanding blade 76 gradually opens in the X4 direction from the closed state while being rotated by the rotational torque of the kelly bar 20, increasing the degree of opening. For example, the radius of the rotation locus circle C1 of the diameter expansion blade 76 when the opening is 50% during diameter expansion is r1, which is the diameter expansion amount when the opening is 50%. Further, the radius of the rotation locus circle C2 of the diameter expansion blade 76 when the diameter is completely expanded and the opening is 100% is r2, which is the diameter expansion amount when the opening is 100%.

As shown in FIG. 3, the enlarged diameter wing 76 has an upper sloping wing 76a having a triangular shape when viewed from the side, a rising wing 76b having a rectangular shape when viewed from the side, and a downward sloping wing 76c having an inverted triangular shape when viewed from the side. It has a side view shape, and a plurality of cutting bits 76d are attached to the side ends of each part. The cutting bit 76d may be a fixed bit that is completely fixed, or may be a combination of a fixed bit and a rotatable rotating bit. Further, even if the enlarged diameter wing 76 does not include the lower inclined portion wing 76c as in the illustrated example, and has a shape in which the upper inclined portion wing 76a and the rising portion wing 76b are continuous in side view. good.

In this way, by operating the hydraulic jack 60, the expanded wing 76 can be formed in the open posture, but as shown in FIG. and is transmitted in the Z2 direction to the keliver 20 fixed to the inner tube 30 via the inner tube 30 on which the load transmitting body 50 is mounted. Therefore, even in a state where there is no reaction force from the ground below when opening and closing the stirring blade 76, the opening and closing of the stirring blade 76 can be realized by transmitting the reaction force when the hydraulic jack 60 is operated to the kelly bar 20. be possible.

As shown in FIG. 2 , one end of a wire 210 extending from the diameter expansion amount management device 200 is attached to the shaft 73 when the diameter expansion blade 76 is in the closed posture (0% opening). Then, as shown in FIG. 3, when the shaft body 73 slides downward and is in the open position (opening degree 100%), the displacement amount u of the wire 210 is used as the feeding amount of the wire 210, and the diameter expansion amount management device Measured at 200.

As will be described again below, the relationship between the displacement amount u (the feed amount u of the wire 210) and the radius r2 of the rotation locus circle C2 shown in FIG. , and the relationship between the diameter expansion amount in a plurality of stages from 0% to 100% opening (for example, 20%, 50%, 80%, etc.) and the feed amount at each diameter expansion amount , specified by test construction, etc.

5(a) and 5(b) show enlarged diameter section pile holes having intermediate enlarged diameter section pile holes formed using the enlarged diameter section pile hole excavator 100. FIG.

The enlarged-diameter portion pile hole PA shown in FIG. and a hole P2. To summarize the construction method of the pile hole PA for the enlarged diameter part, the pile hole P1 for the shaft part is formed to a predetermined depth in the ground G to be constructed. Here, when constructing the pile hole P1 for the shaft portion, a drilling bucket (a drilling bucket (a drilling bucket ( not shown). Next, by attaching a mechanical diameter expansion bucket 80 having a hydraulic mechanism instead of the drilling bucket to the tip of the kelly bar 20 suspended by the base machine 10, the pile hole for the diameter expansion part shown in FIG. An excavator 100 is formed to position a mechanical expanding bucket 80 via a kelly bar 20 at a predetermined depth. Then, as already described with reference to FIGS. 3 and 4, the hydraulic jack 60 is actuated to form the expanded diameter blade 76 in the open posture, and the rotational torque of the keliver 20 rotates the expanded diameter blade 76. Excavate the ground. This excavation is performed while the lid portion 78 of the mechanical diameter-expanding bucket 70 is open, and below the shaft portion pile hole P1 below the mechanical diameter-expanding bucket 80, residual soil of the excavated earth and sand is deposited. . After excavation by the mechanical diameter-expansion bucket 80, the diameter-expansion blade 76 is closed and retracted outside the hole, thereby forming the intermediate diameter-expansion pile hole P2 at the intermediate depth of the shaft pile hole P1. Next, a drilling bucket is attached to the tip of the kelly bar 20 instead of the mechanical diameter-expanding bucket 80 having a hydraulic mechanism, and the excavated earth and sand accumulated below the pile hole P1 for the shaft portion is removed to the drilling bucket. The pile hole PA for enlarged diameter portion shown in FIG.

On the other hand, the enlarged diameter portion pile hole PB shown in FIG. and an enlarged bottom pile hole P3 for an enlarged bottom portion at the bottom of the shaft pile hole P1. To summarize the construction method of the enlarged diameter portion pile hole PB, construction is performed by the construction method similar to that of the enlarged diameter portion pile hole PA until the formation of the intermediate enlarged diameter portion pile hole P2. Next, by attaching a mechanical diameter expanding bucket (not shown) having no hydraulic mechanism to the tip of the kelly bar 20 instead of the drilling bucket, a pile hole excavator for an enlarged bottom portion is formed. After the mechanical diameter-expansion bucket is grounded on the bottom ground of the shaft pile hole P1 via 20, and the diameter-expansion wings of the mechanical diameter-expansion bucket are opened by taking a reaction force on the bottom ground. , rotates a mechanical expansion bucket via a kelly bar 20 to excavate the ground. After excavation by the mechanical diameter-expanding bucket, the diameter-expanding wing is closed and retreated to the outside of the hole, thereby forming the enlarged bottom pile hole P3 at the bottom of the shaft pile hole P1, and forming the shaft pile hole P1. , a pile hole PB for an enlarged diameter pile having a pile hole P2 for an intermediate diameter enlarged portion and a pile hole P3 for an enlarged bottom portion is formed.

Here, in forming the pile hole P3 for the enlarged bottom portion, the amount of earth and sand excavated by the mechanical diameter-expanding bucket is equivalent to the volume of the portion below the diameter-expanding wing 76 of the mechanical diameter-expanding bucket. Manage so as not to exceed the amount. If the amount of earth and sand excavated at one time exceeds the earth and sand capacity of the mechanical diameter-expanding bucket, the earth and sand that cannot be accommodated will be caught between the diameter-expanding blade 76 and the wing stopper 77, and the mechanical diameter-expanding bucket will be forced to operate. It cannot be completely closed, and there is a risk that it will be difficult to pull it up to the ground. Therefore, it is necessary to preset a diameter expansion amount corresponding to one excavation amount of earth and sand, and repeat excavating the ground and carrying out the earth and sand with the mechanical diameter expansion bucket many times until the predetermined diameter expansion amount is reached. The feed amount of the wire 210 corresponding to one diameter expansion amount is initially set to about 3 cm for cohesive soil and about 5 cm for sandy soil. It is desirable to increase the amount as appropriate within a range that does not exceed the amount to be used.

After the pile holes PA and PB for the expanded piles are created, the dimensions inside the hole walls are measured and the finished shape is confirmed. By driving the , an enlarged diameter pile having a shank and an intermediate enlarged diameter portion in the middle of the shank, or a shank, an intermediate enlarged diameter portion, and an expanded bottom at the bottom of the shank An expansion pile having a section (neither shown) is installed.

In the description so far, with reference to FIGS. The amount of diameter expansion is described as being managed by the diameter expansion amount management system 500 according to the embodiment, but in addition to that, it is applied when forming the expanded bottom pile hole P3, equipped with a hydraulic mechanism The diameter expansion amount management system 500 according to the embodiment also manages the diameter expansion amount of the diameter expansion blade of the mechanical diameter expansion bucket that is not in use.

[Diameter expansion amount management device according to the embodiment]
Next, an example of the diameter expansion amount management device according to the embodiment will be described with reference to FIGS. 6 and 9. FIG. Here, FIG. 6 is a front view showing the appearance of the diameter expansion amount management device according to the embodiment, and FIG. 7 is a perspective view showing the internal configuration of the diameter expansion amount management device according to the embodiment. Moreover, FIG. 8 is a diagram for explaining the action of the counterweight when the wire is fed out. Furthermore, FIG. 9 is a diagram showing an example of a hardware configuration of a controller included in the diameter expansion amount management device according to the embodiment.

As shown in FIG. 6, the diameter expansion amount management device 200 has a wireless antenna 202 attached to the front of a box 201. A wire 210 measured by a measuring instrument 220 such as an encoder shown in FIG. is transmitted to the mobile terminal 300. A power switch 204 is provided on the front of the box 201. When the power switch 204 is set to RUN, the motor 212 shown in FIG. Furthermore, when the power switch 204 is set to RUN, the power of the measuring instrument 220 is also turned on.

Furthermore, as shown in FIG. 6, one end of the wire 210 wound inside the box 201 extends downward from the bottom surface of the box 201, and as shown in FIG. It is attached.

As shown in FIG. 7, a motor 212, a wire reel 216, a pulley 218, a measuring instrument 220 such as an encoder, a constant current machine 224, and a controller 230 are arranged in a box 201 forming the diameter expansion amount management device 200. is set.

The drive shaft of the motor 212 and the drive shaft of the wire reel 216 are connected via a transmission chain so that the driving force of the motor 212 is transmitted to the wire reel 216 so that the wire 210 can be automatically wound.

A pulley 218 is arranged on the side of the wire reel 216 , and the wire 210 wound around the wire reel 216 is passed through the pulley 218 to the outside through a wire hole 203 opened on the side of the box 201 . extended. One end of this externally extending wire 210 will be attached to the shaft 73 as described above.

An elastic shaft 223 is inserted through the center hole of the pulley 218, a measuring instrument 220 is attached to one end of the elastic shaft 223, and a counterweight 222 is attached to the other end. Here, as shown in FIG. 8, the pulley 218 is attached to the box 201 so as to be capable of swinging in the Z3 direction so that it can easily follow the movement of the position where the wire 210 is unwound from the wire reel 216. be.

When the wire 210 is sent out according to the sliding of the shaft 73, if the wire 210 is forcefully sent out through the pulley 218, the measuring instrument 220 vibrates in the Z1 direction as shown in FIG. Due to the vibration of the measuring device 220, the wire 210 tends to be biased toward the end within the width t of the wire reel 216, which may hinder the smooth delivery of the wire 210. FIG. Therefore, by placing the measuring instrument 220 on one side around the wire reel 216 and placing a counterweight 222 having approximately the same weight as the measuring instrument 220 on the other side, the vibration of the measuring instrument 220 in the Z1 direction is counteracted. The weight 222 vibrates in the Z2 direction, making it possible to eliminate the deflection of the wire 210 caused by the vibration of the measuring instrument 220 .

Returning to FIG. 7, a constant current machine 224 is further arranged inside the box 201 . A constant current machine 224 performs control in which a constant current is provided to the motor 212 to drive it with a constant torque.

Further, as shown in FIG. 9, the controller 230 is a computer in the main body of the diameter expansion amount management device 200. As shown in FIG. In FIG. 9, the controller 230 has a CPU (Central Processing Unit) 232, a RAM (Random Access Memory) 234, a ROM (Read Only Memory) 236, and the like.

The ROM 236 stores various programs and data used by the programs. The RAM 234 is used as a storage area for loading programs and as a work area for the loaded programs. The CPU 232 implements various functions by processing programs loaded in the RAM 234 . For example, the controller 230 stores measurement data regarding the feed amount of the wire 210 measured by the measuring device 220 . In addition, control is executed to transmit the stored measurement data to the mobile terminal 300 via the communication interface 202 . Further, the wire 210 is automatically wound by the motor 212, and when the automatic winding is completed, the drive shaft of the motor 212 is idly rotated to prevent the motor 212 from being seized. The controller 230 also incorporates an AD converter or the like that converts analog data transmitted from the measurement data 220 into digital data.

[mobile terminal]
Next, with reference to FIGS. 10 and 11, an example of a portable terminal that constitutes the diameter expansion amount management system according to the embodiment will be described. Here, FIG. 10 is a diagram showing an example of the hardware configuration of a mobile terminal included in the diameter expansion amount management system according to the embodiment, and FIG. 11 is a diagram showing an example of the functional configuration of the mobile terminal.

The mobile terminal 300 has a CPU 302, a memory 304, an auxiliary storage device 306, a wireless communication device 308, a display device 310, an input device 312, and the like.

Auxiliary storage device 306 stores programs and the like installed in portable terminal 300 . The memory 304 reads out and stores the program from the auxiliary storage device 306 when a program activation instruction is received. CPU 302 implements the functions of portable terminal 300 according to programs stored in memory 304 . The display device 310 is composed of a liquid crystal display or the like, and has a display function of a touch panel, for example. The input device 312 is an electronic component having a sensor that detects contact of a contact with the display device 310 . Methods for detecting the contact of the contact body include an electrostatic method, a resistive film method, an optical method, and the like. As this contact body, an inspector's finger, a dedicated pen, or the like can be used. A wireless communication device 308 is an electronic component such as an antenna that is necessary for communication in a wireless LAN, mobile communication network, or the like.

Under the control of the CPU 302, the mobile terminal 300 functions as the receiving section 320, the display section 330, and the storage section 340 shown in FIG.

The receiving unit 320 receives measurement data relating to the feeding amount of the wire 210 transmitted from the diameter expansion amount management device 200 at any time. The received measurement data is stored in the storage unit 340 as needed.

The storage unit 340 stores data related to the feed amount of the wire 210 and the diameter expansion amount of the diameter expansion wings 76 . The expansion amount (expansion radius) at a plurality of stages from 0% to 100% of the opening degree of the expansion blade 76, for example, 20%, 50%, 80%, and 100%, and the expansion amount at each expansion amount The relationship with the delivery amount is specified in advance by test construction or the like, and the specified related data is stored in the storage unit 340 .

The display unit 330 simultaneously displays data related to the feed amount of the wire 210 and the diameter expansion amount of the diameter expansion wings 76 and measurement data related to the feed amount of the wire 210 . The operator and the construction manager of the pile hole excavator 100 for diameter expansion part can manage the diameter expansion amount simultaneously with the diameter expansion construction while referring to both data displayed on the display unit 330 .

If it is confirmed that the widening wings 76 are not opened to the desired degree of opening (for example, 100%), it is immediately recognized that the prepared pile hole for the enlarged diameter portion does not satisfy the designed shape. can be specified. In such a case, the mechanical diameter expansion bucket 80 is evacuated to the outside for maintenance, etc., and the diameter expansion part pile hole is formed again, so that the diameter expansion part pile hole that satisfies the design finished shape. becomes possible to create.

[Method for managing diameter expansion amount according to the embodiment]
Next, an example of a diameter expansion amount management method according to the embodiment will be described with reference to FIGS. 12 and 13. FIG.

<Diameter Expansion Amount Management Method According to First Embodiment>
First, with reference to FIG. 12, an example of a radial expansion amount management method according to the first embodiment will be described. Here, FIG. 12 is a flow chart showing the diameter expansion amount management method according to the first embodiment.

First, data relating to the feed amount of the wire 210 and the diameter expansion amount of the diameter expansion blade 76 is created by test execution or the like (step S10).

Next, the diameter expansion amount management system 500 shown in FIG. 1 is installed in the diameter expansion section pile hole excavator 100 (step S12). For this installation, the diameter expansion amount management device 200 is installed on the turntable 15, and the portable terminal 300 is installed on the operator's seat of the base machine 10 or the like.

Next, one end of the wire 210 is pulled out from the diameter expansion amount management device 200 and attached to the shaft 73 constituting the mechanical diameter expansion bucket 80 (step S14). This attachment is done prior to rotating the kelly bar 20 and actuating the mechanical expander bucket 80 to open the expander wings 76 .

Next, the mechanical diameter-expanding bucket 80 is lowered to a predetermined depth in the hole, and the initial value of the feeding amount of the wire 210 is set with the diameter-expanding wings 76 closed. Next, the shaft 73 is slid downward while rotating the mechanical diameter-expansion bucket 80, and diameter-expansion excavation is performed while the diameter-expansion wings 76 are gradually opened. During the process of sliding the shaft body 73 and opening the enlarged diameter wings 76, the feed amount of the wire 210 is measured at any time by the measuring device 220 (step S16). Measurement data measured by the measuring device 220 is transmitted to the mobile terminal 300 as needed.

On the portable terminal 300 of the pile hole excavator 100 for the diameter expansion section, data related to the feed amount of the wire 210 and the diameter expansion amount of the diameter expansion blade 76, and measurement data related to the feed amount of the wire 210 are displayed at the same time. be. The operator or the like of the pile hole excavator 100 for the diameter expansion part manages the diameter expansion amount simultaneously with the diameter expansion construction, referring to both data displayed on the display unit 330 (step S18).

Here, the depth and time of the mechanical diameter-expanding bucket 80 may be added to the measurement data regarding the feed amount of the wire 210 . As a result, it is possible to automatically store a series of construction records of the descent of the mechanical diameter-expanding bucket 80 to a predetermined depth in the excavation hole, the amount of diameter expansion, the rise to the ground, and the carrying out of the excavated soil. It will be possible to use it to create a result report and to understand and analyze the construction status when an unexpected event occurs.

<Diameter Expansion Amount Management Method According to Second Embodiment>
Next, an example of a diameter expansion amount management method according to the second embodiment will be described with reference to FIGS. 13 and 14. FIG. Here, FIG. 13 is a flow chart showing the diameter expansion amount management method according to the second embodiment, and FIG. 14 is a diagram for explaining the diameter expansion amount management method according to the second embodiment.

The diameter expansion amount management method according to this embodiment is a method for managing the diameter expansion amount without using the diameter expansion amount management device 200 or the diameter expansion amount management system 500 .

First, data related to the wire feeding amount and the diameter expansion amount of the diameter expansion blade 76 are created by test execution or the like (step S20).

Next, the wire reel 14A around which the wire is wound is installed on the turntable 15 of the pile hole excavator 100 for enlarged diameter portion (step S22). Here, the wire reel 14A is provided with a spiral spring, and by exerting tension on the wire 210 that is sent out, the wire 210 is prevented from slack and can be automatically wound.

Next, one end of the wire is pulled out from the wire reel 14A and attached to the shaft 73 constituting the mechanical diameter expanding bucket 80 (step S24). This attachment is done prior to rotating the kelly bar 20 and actuating the mechanical expander bucket 80 to open the expander wings 76 .

Next, the mechanical diameter-expanding bucket 80 is lowered into the excavation hole to position the mechanical diameter-expanding bucket 80 at a predetermined depth in the hole in a closed posture (step S25). In this process, the wire 210 is sent out from the wire reel 14A. Then, initial value marking is performed on the wire 210 at a position corresponding to the reference level (step S26). Here, the reference level is measured by a reference beam KB, a laser level (not shown), an optical level (not shown), or the like. After appropriately checking the level of the reference beam KB with an optical level, the reference beam KB is placed on the upper end of the casing CA to facilitate removal and installation when the mechanical diameter expansion bucket 80 is taken in and out of the casing CA. You may enable it.

Next, while rotating the mechanical diameter-expanding bucket 80, the shaft 73 is slid downward, and the diameter-expanding excavation is performed while gradually opening the diameter-expanding wings 76 (step S27). In the process of sliding the shaft 73 and opening the diameter-enlarging wings 76, the wire is fed from the wire reel 14A, and the initial value marking position M1 moves below the reference level. At this time, by measuring the distance between the initial value marking position M1 and the reference level, it is possible to confirm the feeding amount of the wire 210 . Here, a ruler with a scale, a tape measure, or the like may be attached to the wire 210 with reference to the initial value marking position M1.

Then, for example, when the shaft 73 slides to the lower end and the mechanical diameter-expanding bucket 80 is completely opened, the post-diameter-expansion marking M2 is performed at a position of the wire 210 corresponding to the reference level (step S28).

Next, the distance between the initial value marking and the diameter-expanded marking is measured to obtain a measured value (step S30).

Then, while referring to data related to the amount of wire feed, the amount of diameter expansion of the diameter-expansion blade 76, and the measured value (the amount of wire feed), the amount of diameter expansion is managed at the same time as the diameter expansion is performed (step S32).

Here, the procedure for performing the post-diameter-expansion marking process after the diameter-expansion excavation process is shown. Post-diameter-expansion marking may be performed in advance on the position taken upward. By doing so, in the diameter expansion excavation process, it is possible to visually confirm whether or not the marking position after diameter expansion reaches the reference level, and it is possible to prevent the diameter expansion amount from exceeding a predetermined value. It is not necessary to repeat the post-diameter-expansion marking and measurement value acquisition before the diameter-expansion amount reaches a predetermined value.

According to the diameter expansion amount management method according to the present embodiment, without using a special device or system, a manager, a worker, or the like marks a plurality of markings on the wire that is sent out, and measures the distance between the markings. The amount of diameter expansion can be managed while comparing the measured value with data related to the amount of diameter expansion of the diameter expansion blade and the feed amount of the wire. In addition, a series of operations and confirmations are limited to the vicinity of the pile hole mouth, so workability is good, and the confirmation of workers, base machine operators, administrators, etc. can be performed quickly. Further, the reliability of diameter expansion amount management may be enhanced by using the diameter expansion amount management method according to the present embodiment as a double check in combination with the diameter expansion amount management method according to the first embodiment.

It should be noted that other embodiments may be possible in which other constituent elements are combined with the configurations listed in the above embodiments, and the present invention is not limited to the configurations shown here. . Regarding this point, it is possible to change without departing from the gist of the present invention, and it can be determined appropriately according to the application form.

10: Base machine, 11: Boom, 12: Support beam, 13: Rotary drive unit, 14: Reel, 14A: Wire reel, 15: Turntable, 16: Wire, 20: Kelly bar, 30: Inner pipe, 31: Third 1 upper lid, 32: first cylindrical body, 33: engaging projection, 35: roller (rotating mechanism), 40: outer tube, 41: lower lid, 42: second cylindrical body, 43: engaged projection, 50: Load transmission body 51: Second upper lid 52: Third cylindrical body 53: Opening for kelly bar 54: Connecting member 60: Hydraulic jack (hydraulic mechanism) 61: Cylinder 62: Piston rod 70: Mechanical Diameter expanding bucket 71: outer body 72: inner body (cylindrical body) 73: shaft 74: arm 74a: key 74b: end cover 74c: universal joint 74d: connecting member 75: Guide groove 76: diameter expansion blade 76a: upper inclined portion blade 76b: rising portion blade 76c: lower inclined portion blade 76d: cutting bit 77: blade stopper 80: mechanical diameter expansion provided with hydraulic mechanism Bucket (mechanical diameter expansion bucket), 85: Stabilizer, 100: Pile hole excavator for diameter expansion portion, 200: Diameter expansion amount management device, 202: Wireless antenna (communication interface), 204: Power switch, 210: Wire, 212: Motor, 214: Transmission Chain, 216: Wire Reel, 218: Pulley, 220: Measuring Instrument (Encoder), 222: Counterweight, 224: Constant Current Machine, 230: Controller, 300: Mobile Terminal, 320: Receiver , 330: display unit, 340: storage unit, 400: network, 500: diameter expansion amount management system, G: ground, PA, PB: diameter expansion pile hole, P1: shaft pile hole, P2: intermediate expansion Pile hole for diameter part, P3: Pile hole for expanded bottom part, KB: Reference beam, CA: Casing

Claims (5)

Applied when constructing an enlarged diameter pile having a shaft portion and an enlarged diameter portion, using a prepared pile hole for the shaft portion to create a pile hole for the enlarged diameter portion with a pile hole excavator for the enlarged diameter portion A diameter expansion amount management device,
The pile hole excavator for the diameter expansion section has a mechanical diameter expansion bucket attached to the tip of a rotating kelly bar, and the mechanical diameter expansion bucket slides inside a tubular body and the tubular body. a shaft that moves and is fixed directly or indirectly to the Kerry bar;
The diameter expansion amount management device has a wire, a motor that automatically winds the wire, and a measuring device that measures the wire feed amount associated with the diameter expansion amount of the diameter expansion blade,
One end of the wire is attached to the shaft, and the wire is sent out when the diameter-enlarging wings are opened by sliding of the shaft,
A diameter expansion amount management device, wherein the wire is automatically wound by the motor when one end of the wire is removed from the shaft. The pile hole excavator for the enlarged diameter portion has a turntable that rotates in synchronization with the kelly bar,
2. The diameter expansion amount management device according to claim 1, wherein said diameter expansion amount management device is mounted on said turntable. A diameter expansion amount management system comprising the diameter expansion amount management device according to claim 1 or 2 and a portable terminal,
The mobile terminal is
a storage unit that stores data related to the amount of feed of the wire and the amount of diameter expansion of the diameter expansion blade;
a receiving unit that receives measurement data about the amount of feed of the wire by the measuring device;
A diameter expansion amount management system, comprising: a display section for displaying both the related data and the measurement data. Applied when constructing an enlarged diameter pile having a shaft portion and an enlarged diameter portion, using a prepared pile hole for the shaft portion to create a pile hole for the enlarged diameter portion with a pile hole excavator for the enlarged diameter portion A diameter expansion amount management method,
The pile hole excavator for the diameter expansion section has a mechanical diameter expansion bucket attached to the tip of a rotating kelly bar, and the mechanical diameter expansion bucket slides inside a tubular body and the tubular body. a shaft that moves and is fixed directly or indirectly to the Kerry bar;
A step of attaching one end of the wire to the shaft using the diameter expansion amount management system according to claim 3;
a step of measuring a feed amount of the wire when the radial expansion blade opens due to sliding of the shaft;
A method for controlling the amount of diameter expansion, comprising: managing the amount of diameter expansion based on data related to the amount of feed of the wire and the amount of diameter expansion of the diameter expansion blade. Applied when constructing an enlarged diameter pile having a shaft portion and an enlarged diameter portion, using a prepared pile hole for the shaft portion to create a pile hole for the enlarged diameter portion with a pile hole excavator for the enlarged diameter portion A diameter expansion amount management method,
The pile hole excavator for the diameter expansion part has a mechanical diameter expansion bucket attached to the tip of a rotating kelly bar, and a turntable that rotates in synchronization with the kelly bar, and the mechanical diameter expansion bucket A tubular body, a shaft that slides inside the tubular body and is directly or indirectly fixed to the kelly bar, and a diameter-expanding wing to which the tip of an arm that extends from the shaft is attached. and
A reel wound with a wire is placed on the turntable, one end of the wire is attached to the shaft, and the mechanical diameter-expanding bucket is positioned at a predetermined depth in the pile hole for the shaft in a closed posture. a step of marking an initial value on a position of the wire corresponding to the reference level while
The wire is sent out when the radially expanding wings are opened by sliding of the shaft, and the distance between the initial value marking provided on the sent wire and the reference level is measured to obtain a measurement value. and managing the amount of diameter expansion while comparing data relating to the amount of diameter expansion of the diameter expansion blade and the feed amount of the wire with the measured values. quantity control method.

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