JP2013185403A - Erection device and erection method of reinforcement cage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an erection device and an erection method of a reinforcement cage, capable of effectively utilizing a limited space and efficiently performing work on a construction site with a limited height.SOLUTION: A lifting device 1 includes a pair of bases 2 and a pair each of posts 6 provided at an interval on the bases 2. The post 6 is provided with a rectangular movable frame 10 to be elevated and lowered in a vertical direction, and the movable frame 10 has a plurality of holders 13 projected to the inner side of the movable frame 10 and provided with a pin 15 that can be engaged with a reinforcement cage unit 12. A lower holding device includes an annular base disposed at a peripheral edge of a pile hole, and the base has a plurality of holders 33 projected to the inner side thereof and provided with a pin 34 that can be engaged with the reinforcement cage unit 12.

Description

  TECHNICAL FIELD The present invention relates to a reinforcing bar erection device and an erection method, and more particularly, to a pile at a construction site where the head is limited, for example, when a cast-in-place stake is built on the ground below a station platform. It relates to the technique of building a reinforcing bar in the hole.

  For example, in a station premises, when a large-diameter cast-in-place pile is built on the ground below the platform, the sky head is extremely limited due to obstacles such as a platform roof. For this reason, it becomes difficult to carry in the steel bar and build it into the pile hole accompanying the cast-in-place pile construction.

  As a conventional construction method, there is a method of using an electric chain block in combination according to construction conditions (see Patent Document 1 presented as a similar construction method). However, in the method using the electric chain block, it is necessary to wind the chain, so the overhead space cannot be used effectively. That is, in the case of a large-diameter pile, since the weight of the reinforcing bar is increased, a chain block having a high lifting capacity is required, and accordingly, the length of the chain block is increased, so that the liftable height is reduced.

  In addition, when using chain blocks, it is necessary to install a separate device that intercepts the rebar rod, but in places where the work area is limited, such as on a platform, frequent removal and movement of devices is required. As a result, work efficiency decreases.

JP-A-11-147690

The present invention has been made based on the technical background as described above, and achieves the following object.
The object of the present invention is to effectively use a limited space and efficiently work in a construction site where the empty head is restricted, such as when a large-sized cast-in-place pile is built on the ground below the station platform. An object of the present invention is to provide a rebar erection apparatus and a reinforcement method that can be performed well.

The present invention employs the following means in order to achieve the above object.
That is, the present invention is an apparatus for installing a rebar rod unit divided into excavated pile holes, the lifting device for holding and lowering the rebar rod unit, and the lowered rebar rod unit at the periphery of the pile hole. Consisting of a lower gripping device to grip,
The lifting device includes a pair of runnable bases arranged parallel to each other so as to sandwich a pile hole, and a pair of posts provided on each of the bases at intervals.
The tops of the posts are connected to each other by a frame, and the post is provided with a rectangular movable frame that moves up and down in the vertical direction.
The movable frame is provided with a plurality of gripping tools having a pin projecting inward of the movable frame at intervals in the circumferential direction and having a pin engageable with the reinforcing bar unit.
The lower gripping device has a base that is annularly arranged on the periphery of the pile hole,
The base is provided with a plurality of grips having a pin projecting inward of the base at intervals in the circumferential direction and having pins engageable with the reinforcing bar unit. In the device.

More specifically, each post of the elevating device is composed of a telescopic multiple tube, the innermost tube is fixed to the base, and is extended by the telescopic drive mechanism so that the outermost tube reaches the highest position. And
Between each pair of outermost tubes facing each other, a movable beam that is moved up and down along the outermost tube by an elevating drive mechanism is provided,
A pair of coupled beams are provided between these movable beams, and the movable movable frame and the coupled beams constitute the rectangular movable frame.

  Further, each gripping tool of the movable frame and each gripping tool of the lower gripping device are arranged so as to be displaced from each other in the circumferential direction, and when the movable frame is lowered to the lowest lowered position, The pin of the gripping tool and the pin of the gripping tool of the lower gripping device are configured to have substantially the same level.

  Further, the telescopic drive mechanism is composed of a multi-stage hydraulic jack, and is installed vertically inside the multiple pipe. Further, the elevating drive mechanism is provided at both end portions of the movable beam, and is fitted to the outer periphery of the outermost tube so as to be freely movable, and the rod tip faces the outside of the outermost tube. A hydraulic jack having a sprocket at the tip of the rod and a chain wound around the sprocket, one end fixed to the fitting portion and the other end fixed to the outermost tube. Prepare.

  Further, each base of the lifting device is provided with a pair of outrigger devices having a centering function with respect to the pile hole of the lifting device, the rod end of the lifting device being connected to the base from the base. A hydraulic jack provided vertically so as to protrude downward, a roller device connected to the tip of the rod so as to be rotatable in the horizontal direction, and a grounding that accommodates the roller device and guides it in a horizontal direction. The shoe includes a shoe and a hydraulic jack that is provided horizontally on the ground shoe and is connected to the roller device.

In addition, the present invention is a method for building a reinforcing bar rod in a pile hole using the above-described building device,
The step of gripping the reinforcing bar rod unit previously built in the pile hole by the gripping tool of the lower gripping device,
Moving the lifting device to the standby position of the reinforcing bar unit adjacent to the pile hole, and gripping the new reinforcing bar unit with a gripping tool of the lifting device;
Moving the lifting device onto the pile hole and joining the lower end of the new reinforcing bar unit and the upper end of the preceding reinforcing bar unit;
Releasing the holding of the preceding reinforcing bar rod unit by the gripping tool of the lower holding device, and lowering the movable frame to build a new reinforcing bar rod unit in the pile hole;
Holding a new reinforcing bar unit with a gripping tool of a lower gripping device at a lowered position of the movable frame, and releasing the gripping by the gripping tool of the lifting device,
The above-described steps are repeated to build a reinforcing bar rod in a pile hole.

  According to the present invention, the movable frame that moves up and down in the vertical direction is provided with a gripping tool, and the reinforcing bar unit that is gripped by the gripping tool is built into the pile hole by lowering the movable frame. As in the case of constructing a cast-in-place pile, the limited space can be used effectively at the construction site where the sky head is restricted, and the work can be performed efficiently.

It is a top view which shows embodiment of the raising / lowering apparatus in the reinforcing bar construction apparatus of this invention. It is a front view of the thing of the embodiment. It is a front view which shows raising / lowering of the movable beam in the state which shortened the post | mailbox. It is a side view of the raising / lowering apparatus of the state which shortened the post | mailbox. It is a side view which shows the upper holding tool of a reinforcing bar rod. It is a front view of the holding tool. It is a rear view of the holding tool. It is a top view of the holding tool. It is a top view which shows the raising / lowering drive mechanism of a movable beam. It is a side view of the raising / lowering drive mechanism. It is a top view which shows embodiment of a lower holding | grip apparatus. It is a figure which shows the construction method of a reinforcing bar for every process. FIG. 13 is a diagram illustrating a process subsequent to FIG. 12. FIG. 14 is a diagram illustrating a process subsequent to FIG. 13. FIG. 15 is a diagram illustrating a process subsequent to FIG. 14. FIG. 16 is a diagram illustrating a process subsequent to FIG. 15. It is a front view which shows embodiment of the outrigger apparatus which has a centering function. It is a side view of the thing of the embodiment. It is a top view of the thing of the embodiment. It is a side view which shows the grounding state of the thing of the embodiment.

  Embodiments of the present invention will be described below with reference to the drawings. The reinforcing bar erection device is composed of a lifting device (FIGS. 1 to 10) and a lower gripping device (FIG. 11). The lifting device 1 includes a pair of bases 2 and 2 that are arranged in parallel to each other so as to sandwich the pile hole 31. Traveling wheels 3 are provided at the lower ends of both ends of each base 2 so that the lifting device 1 can travel. Each base 2 is provided with a pair of outrigger devices 4 for fixing the base to the installation surface (see FIGS. 4 and 11). The outrigger device 4 includes a hydraulic jack 4a provided on the base 2 and a grounding shoe 5 provided at the tip thereof, and the base 2 is fixed when the hydraulic jack 4a is activated and the grounding shoe 5 presses the ground. . The outrigger device 4 can be provided with a centering function for the lifting device, which will be described later.

  A pair of posts 6 are provided on both ends of each base 2, that is, spaced apart in the length direction of the base. Accordingly, there are a total of four posts 6, and these posts 6 are respectively arranged at the four corners of a quadrangle in plan view. The post 6 is composed of a triple tube including an inner tube 6a, an intermediate tube 6b, and an outer tube 6c (see FIG. 2), and is extendable. The inner tube 6a, the intermediate tube 6b, and the outer tube 6c are all rectangular tubes having a square cross section, and the lower end of the inner tube 6a is fixed to the base 2. Although illustration is omitted in order to avoid complication of the drawing, a two-stage hydraulic jack for extending and retracting the post 6 is accommodated inside the inner pipe 6a. When the two-stage hydraulic jack is extended, the intermediate pipe 6b and the outer pipe 6c are sequentially raised, that is, the post 3 is extended. At this extension, the outer pipe 6c reaches the highest position.

  The tops of the outer tubes 6 c of the posts 6 are connected to each other by a frame 7. Movable beams 8 and 8 that move up and down along the outer tube 6c are provided between the outer tubes 6c and 6c of the posts 6 and 6 that are on the opposite bases 2 and 2 and face each other. The end portions of the movable beams 8 and 8 are connected by a connecting beam 9, and the movable beams 8 and 8 and the connecting beams 9 and 9 constitute a rectangular movable frame 10 as a whole.

  Brackets 11 are provided at the four corners of the movable frame 10. These brackets 11 are provided with gripping tools 13 for reinforcing bar 12. 5 to 8 show details of the gripping tool 13. The gripping tool 13 has a main body plate 14 fixed to the lower surface of the bracket 11, and the main body plate 14 is provided with a guide tube 16 for a gripping pin 15. The grip pin 15 is loosely fitted to the guide cylinder 16 and can be protruded and retracted inward of the movable frame 10.

  A grip 17 is provided at the rear end of the grip pin 15, and the operator grips the grip 17 and puts the grip pin 15 in and out. A retaining pin 18 is provided at the rear end of the guide tube 16. The retaining pin 18 is fitted in a hole provided in the direction perpendicular to the pin axis on the outer periphery of the gripping pin 15 so that the gripping pin 15 protruding from the guide tube 16 does not retreat. On the other hand, the rebar rod 12 has a number of pile axial rebars 27 arranged in the circumferential direction as is well known (see FIGS. 5 and 8), and these pile axial rebars 27 are annularly arranged in multiple stages. The shape holding plate 28 holds the entire shape in a cylindrical shape. Specifically, each pile axial rebar 27 is disposed through a hole provided in the shape maintaining plate 28 at intervals in the circumferential direction. The grip pin 15 protruding from the guide tube 16 engages with the lower surface of the shape holding plate 28 to grip the reinforcing bar 12.

  Here, the grip pin 15 is loosely fitted to the guide tube 16 as described above, and is pivotally supported by the retaining pin 18 when protruding. Therefore, the grip pin 15 can be rotated in the horizontal direction within the range in the guide tube 16. By doing in this way, even if the clearance gap between the pile axial direction reinforcing bars 27 and 27 of the reinforcing bar rod 12 has produced the shift | offset | difference of the circumferential direction with respect to the holding pin 15, the holding pin 15 can be inserted in a clearance gap.

  9 and 10 show the lifting mechanism of the movable beam 8. At both ends of the movable beam 8, fitting portions 20 are provided for fitting on the outer periphery of the outer tube 6 c of the post 6. Stoppers 21a and 21b are provided at the upper and lower ends of the outer tube 6c, and the fitting portion 20 can slide between the stoppers 21a and 21b. A plurality of guide rollers (cam followers) 22 are provided on the inner periphery of the fitting portion 20 so as to be in contact with the outer periphery of the outer tube 6 c and prevent rattling and shaking when the movable beam 8 is raised and lowered.

  The lower stopper 21 b extends outward from the outer tube 6 c and forms the bottom of the jack case 23. The jack case 23 accommodates a hydraulic jack 25 having a rod tip facing upward and a sprocket 24 at the rod tip. A chain 26 is wound around the sprocket 24. One end of the chain 26 is fixed to the fitting portion 20 and the other end is fixed to the lower stopper 21b. As a result, when the hydraulic jack 25 expands and contracts, the sprocket 24 rotates, and the fitting portion 20, that is, the movable beam 8 moves up and down along the outer tube 6 c via the chain 26.

  FIG. 3 is a front view showing a state in which the post 6 is shortened. By moving the movable beam 8 up and down within the length range of the outer tube 6c in the shortened state of the post 6, it is possible to obtain the first lifting stroke A in which the lowered position reaches the vicinity of the installation surface of the lifting device. On the other hand, FIG. 2 shows a state in which the post 6 is extended. Due to the expansion and contraction of the post 6, the movable beam 8 can obtain the second lifting stroke B from the rising position in FIG. 3 to the rising position in FIG. 2, and in total a lifting stroke of A + B can be obtained. In this way, the movable beam 8 can be raised and lowered not only by the expansion and contraction of the post 6 but also along the post 6, so that the movable beam 8, that is, the movable frame 10 can be moved up and down at a construction site where the sky head is limited. It can be as large as possible.

  FIG. 11 shows a lower gripping device 30 for gripping the reinforcing bar 12 built in the pile hole 31 at the periphery of the pile hole. The lower gripping device 30 has an annular (an octagonal shape in the drawing) base 32 disposed on the peripheral edge of the pile hole 31, and a plurality of gripping tools 33 are spaced apart in the circumferential direction on the base 32. It is provided. The gripping tool 33 is the same as the gripping tool 13 of the lifting device described above, and has a gripping pin 34 that can project and retract in the radial direction toward the center of the annular base 32 and can be engaged with the reinforcing bar 12. It has become.

  These gripping tools 33 (hereinafter referred to as “lower gripping tools”) and the gripping tools 13 provided on the movable frame 10 (hereinafter referred to as “upper gripping tools”) are arranged so as to be displaced from each other in the circumferential direction. Therefore, when the movable frame 10 is lowered to the lowest position, the upper gripping tool 13 and the lower gripping tool 33 do not interfere with each other, so that the gripping pins 15 and 34 are at the same level. Yes (see FIG. 3). As a result, the grip and fixing level of the built-in reinforcing bar rod unit 12a can be made as low as possible, and the length of the reinforcing bar rod units sequentially joined at the construction site where the empty head is limited can be ensured to the maximum. 1 and 4, reference numeral 29 indicates a hydraulic unit attached to the frame 7.

  Next, the construction of the reinforcing bar using the above erection device will be described. 12-16 has shown the process of erection of a reinforcing bar. In each figure which shows the process from step 1 to step 9, (a) is a top view, (b) is a side view. The embodiment is an example in which a cast-in-place pile is built under a platform in a station premises, and reference numeral 40 indicates a home end. The excavated pile hole 32 is surrounded by a temporary enclosure 41, a part of which is opened and a rail for moving the reinforcing bar 12 between the pile hole position and the track (only the center line is shown) 42. 43 is laid.

<Step 1 (FIG. 12)>
The reinforcing bar 12 is divided into a plurality of pieces and built in the pile hole 31. The reinforcing bar unit 12a previously built in the pile hole 31 is engaged and gripped by the grip pin 34 protruding from the lower gripper 33 (see also FIG. 2). After the preceding reinforcement bar unit 12a is built, the movable frame 10 of the lifting device 1 is raised to the highest position. A new reinforcing bar rod unit 12b to be added to the preceding reinforcing bar rod unit 12a is mounted on a carriage (not shown), and is transported to a pile construction site using a rail vehicle 44.

<Step 2 (FIG. 12)>
The carriage on which the new reinforcing bar unit 12b is mounted is moved via the rail 43, and the reinforcing bar unit 12b is taken into the standby position adjacent to the pile hole 32.
<Step 3 (FIG. 13)>
The lifting / lowering device 1 is moved to the standby position of the reinforcing bar rod unit 12b.

<Step 4 (FIG. 13)
The movable frame 10 of the lifting device 1 is slightly lowered to the upper position of the reinforcing bar unit 12b. Then, the gripping pin 15 of the upper gripping tool 13 is projected to engage and grip the rebar rod unit 12b, and the movable frame 10 is raised.

<Step 5 (FIG. 14)>
The lifting / lowering device 1 holding the new reinforcing bar rod unit 12 b is moved onto the pile hole 32.
<Step 6 (FIG. 14)>
The movable frame 10 is slightly lowered, and the lower end of the new reinforcing bar rod unit 12b is joined to the upper end of the preceding reinforcing bar rod unit 12a by welding or using a joint or the like (see also FIG. 2).

<Step 7 (FIG. 15)>
After joining of the reinforcing bar unit 12b, the gripping by the lower gripping tool 33 is released. Then, by shortening the post 6, the movable frame 10 is lowered (elevating stroke B), and the reinforcing bar unit 12 b is built in the pile hole 31.

<Step 8 (FIG. 15)>
Next, the movable frame 10 is lowered along the shortened post 6 (elevating stroke A), and the reinforcing bar unit 12 b is further installed in the pile hole 31. As a result, the movable frame 10 is lowered by the lifting stroke A + B, and the movable frame 10 reaches the lowest lowered position near the installation surface of the lifting device 1. At this lowest position, the new reinforcing bar rod unit 12b is gripped by the lower gripping tool 33 and the gripping by the upper gripping tool 13 is released. As described above, the movable frame 10 is lowered in the order of lowering the post 6 and then the movable frame 10 alone. However, the movable frame 10 may be lowered in the reverse order.

<Step 9 (FIG. 16)>
And the movable frame 10 is raised and the process of step 1-step 9 is repeated hereafter, and the reinforcing bar 12 is built in the pile hole 31. FIG.

  17 to 20 show another embodiment of the outrigger device. The outrigger device 50 has a centering function for the pile hole 31 of the lifting device 1. The outriggers 50 are provided with a pair of hydraulic jacks 51 fixed to the base 2, respectively, as in the embodiment described above. The hydraulic jack 51 is provided so that the tip of the rod 52 protrudes downward from the base 2 (see FIG. 20), and a roller device 53 is connected to the tip of the rod 52.

  The roller device 53 used in the embodiment is a well-known device known as a chill tank (trade name), and a connection block 54 is additionally provided on the top plate. A spherical recess 55 is provided on the upper surface of the connection block 54, and the connection block 54 forms a spherical seat. On the other hand, a spherical body 56 is provided at the tip of the rod 52 of the hydraulic jack 51, and the spherical body 56 is fitted in the spherical recess 55 so as not to come out of the connecting block 54. As a result, the rod 52 of the hydraulic jack 51 and the roller device 53 are connected, and the roller device 53 is rotatable in the horizontal direction as indicated by an arrow in FIG.

  The roller device 53 is accommodated in a grounding shoe 57 formed in a case shape. The grounding shoe 57 has a function of a guide or rail for guiding the roller device 53 so as to be movable in the horizontal direction. A hydraulic jack 58 is provided horizontally in the grounding shoe 57, and the hydraulic jack 58 and the roller device 53 are connected via a joint member 59. By operating the hydraulic jack 58, the roller device 53 is guided by the grounding shoe 57 and moves in the horizontal direction.

  The grounding shoe 57 is provided with a plate 60 on the hydraulic jack 58 side so as to cover a part of the upper portion thereof. The plate 60 is provided with a scale plate 61 for indicating the direction angle (angle with respect to the base 2) of the grounding shoe 57 that rotates in the horizontal direction together with the roller device 53 (see FIG. 19). On the other hand, a laser pointer 62 is provided on the base 2 so as to be positioned immediately above the plate 60. By visually observing the scale of the scale plate 61 pointed to by the laser pointer 62, the direction angle of the roller device 53, that is, the grounding shoe 57 can be grasped. A handle 63 is provided at the end of the grounding shoe 57 so that the operator can hold it and rotate the grounding shoe 57 horizontally.

  As shown in FIG. 18, the lifting device 1 is in a shortened state of the hydraulic jack 51, and the grounding shoe 57 is in a state of floating from the ground. In order to center the elevating device 1 above the pile hole 31, first, the direction angle required for centering is measured, and the grounding shoe 57 of each outrigger device is leveled as indicated by an arrow in FIG. Rotate in the direction. Next, as shown in FIG. 20, the hydraulic jack 51 is extended to ground the grounding shoe 57.

  In this state, the load of the lifting device 1 acts on the roller device 53. Then, the hydraulic jack 58 is operated for the stroke necessary for centering. As a result, the roller device 53 moves horizontally in the grounding shoe 57 as indicated by the arrow in FIG. 20, that is, the lifting device 1 moves horizontally in the set direction, and is centered.

  The above embodiment is merely an example, and the present invention can take various forms. For example, the movable beam raising / lowering driving mechanism is not limited to the one shown in the above embodiment, and a rack and pinion mechanism or the like can also be used.

DESCRIPTION OF SYMBOLS 1 Lifting device 2 Base 3 Traveling wheel 6 Post 6a Inner pipe 6b Intermediate pipe 6c Outer pipe 8 Movable beam 9 Connection beam 10 Movable frame 12 Rebar rod 12a, 12b Rebar rod unit 13 Upper gripping tool 15 Holding pin 20 Fitting part 24 Sprocket 31 Pile hole 33 Lower gripping tool 34 Holding pin

Claims (7)

A device for building a reinforcing bar rod unit divided into excavated pile holes, the lifting device for holding and lowering the reinforcing rod rod unit, and a lower gripping device for holding the lowered reinforcing rod rod unit at the periphery of the pile hole Consists of
The lifting device includes a pair of runnable bases arranged parallel to each other so as to sandwich a pile hole, and a pair of posts provided on each of the bases at intervals.
The tops of the posts are connected to each other by a frame, and the post is provided with a rectangular movable frame that moves up and down in the vertical direction.
The movable frame is provided with a plurality of gripping tools having a pin projecting inward of the movable frame at intervals in the circumferential direction and having a pin engageable with the reinforcing bar unit.
The lower gripping device has a base that is annularly arranged on the periphery of the pile hole,
The base is provided with a plurality of grips having a pin projecting inward of the base at intervals in the circumferential direction and having pins engageable with the reinforcing bar unit. Device. Each post of the lifting device is composed of a telescopic multiple tube, the innermost tube is fixed to the base, and is extended by the telescopic drive mechanism so that the outermost tube reaches the highest position.
Between each pair of outermost tubes facing each other, a movable beam that is moved up and down along the outermost tube by an elevating drive mechanism is provided,
2. The reinforcing bar erection apparatus according to claim 1, wherein a pair of connection beams are provided between the movable beams, and the movable frame is formed by the movable and connected beams.   Each gripping tool of the movable frame and each gripping tool of the lower gripping device are arranged so as to be displaced from each other in the circumferential direction, and when the movable frame is lowered to the lowest position, the gripping tool of the movable frame 3. The reinforcing bar erection device according to claim 1, wherein the pin of the lower gripping device and the pin of the gripping tool of the lower gripping device have substantially the same level.   4. The reinforcing bar erection apparatus according to claim 1, wherein the telescopic drive mechanism is composed of a multistage hydraulic jack, and is installed vertically inside the multiple pipe.   The elevating drive mechanism is provided at both end portions of the movable beam, and is fitted to the outer periphery of the outermost tube so as to be freely movable, and the rod tip faces the outside of the outermost tube. A hydraulic jack provided vertically and having a sprocket at the tip of the rod, and a chain wound around the sprocket and having one end fixed to the fitting portion and the other end fixed to the outermost tube, respectively. The reinforcing bar erection device according to any one of claims 1 to 4, wherein:   Each base of the lifting device is provided with a pair of outrigger devices having a centering function with respect to the pile hole of the lifting device at a distance from each other, and the rod tip of the outrigger device is downward from the base. A hydraulic jack provided in a vertical direction so as to protrude, a roller device rotatably connected to the rod tip in the horizontal direction, and a grounding shoe that accommodates the roller device and guides it in a horizontal direction. The reinforcing bar erection device according to any one of claims 1 to 5, further comprising a hydraulic jack provided horizontally on the grounding shoe and connected to the roller device. A method for building a reinforcing bar rod in a pile hole using the building device according to any one of claims 1 to 6,
The step of gripping the reinforcing bar rod unit previously built in the pile hole by the gripping tool of the lower gripping device,
Moving the lifting device to the standby position of the reinforcing bar unit adjacent to the pile hole, and gripping the new reinforcing bar unit with a gripping tool of the lifting device;
Moving the lifting device onto the pile hole and joining the lower end of the new reinforcing bar unit and the upper end of the preceding reinforcing bar unit;
Releasing the holding of the preceding reinforcing bar rod unit by the gripping tool of the lower holding device, and lowering the movable frame to build a new reinforcing bar rod unit in the pile hole;
Holding a new reinforcing bar unit with a gripping tool of a lower gripping device at a lowered position of the movable frame, and releasing the gripping by the gripping tool of the lifting device,
A method of building a reinforcing bar rod, wherein the above steps are repeated to build the reinforcing rod rod into the pile hole.

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