JP2020186538A - Shape holding mechanism, installation device for strand reinforcement cage and installation method for strand reinforcement cage - Google Patents

Abstract

To provide a shape holding mechanism, an installation device for a strand reinforcement cage and an installation method for the strand reinforcement cage capable of holding a shape of the strand reinforcement cage to prevent its deformation when raising it up from a horizontal state to a vertical state.SOLUTION: A method uses a shape holding mechanism 3 comprising: an insertion frame 5 configured to secure a beam member 5b on a frame body 5a, a movable member 7a connected to the frame body 5a, and an end part holding mechanism 31 connected to the beam member 5b; and an installation device 1 provided with a column 9 secured on the beam member 5b and a cylinder 13 to raise up the column 9. Then, inserting the frame body 5a arranged horizontally to a strand reinforcement cage 27 to move the movable member 7a to a direction where a distance from the frame body 5a becomes larger, expands and deploys the strand reinforcement cage 27 in a pile hole 33 through raising the frame body 5a with the cylinder 13 in a state of holding a cross-sectional shape of the strand reinforcement cage 27.SELECTED DRAWING: Figure 3

Description

The present invention relates to a mechanism for maintaining the shape of a strand reinforcing bar cage, a device for building a strand reinforcing bar cage, and a method for building a strand reinforcing bar cage.

Conventionally, when constructing cast-in-place piles, a reinforcing bar cage has been used as a reinforcing bar. If there is a limit to the space above the planned construction position of the pile, use a strand rebar cage with the main bar PC steel stranded wire bent in a spiral to shorten the length, and place the strand rebar cage horizontally near the pile hole. A method has been proposed in which the pile is rotated from a normal state to a vertical state and then extended into a pile hole (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2006-283286

However, since the strand rebar cage has a flexible property, the position of the rebar band may shift and the rebar cage may be deformed when the rebar cage is raised from a horizontal state to a vertical state. Misalignment of the rebar may interfere with the extension of the strand rebar cage.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is a shape that can maintain the shape of the strand rebar cage and prevent deformation when it is raised from a horizontal state to a vertical state. It is an object of the present invention to provide a holding mechanism, a device for building a strand reinforcing bar cage, and a method for building a strand reinforcing bar cage.

In order to achieve the above-mentioned object, the first invention is a shape-retaining mechanism for a strand rebar cage, in which a frame body inserted in the strand rebar cage and a beam member fixed to one end of the frame body are provided. An internal frame to be held, a movable member connected to the frame body so that the distance from the frame body is variable, and holding a circular cross-sectional shape of the strand reinforcing bar cage, and one end connected to the beam member. The shape-retaining mechanism is provided with an end support mechanism having a removable end end at an end portion of the strand reinforcing bar cage on the side far from the beam member.

In the shape holding mechanism of the first invention, the cross-sectional shape of the strand rebar cage is made circular by using the movable member by increasing the distance of the movable member from the frame body in the state where the frame body is inserted in the strand rebar cage. Can be retained. Further, by connecting one end of the end support mechanism to the beam member and attaching the other end to the end on the side far from the beam member of the strand reinforcing bar cage, the end on the side far from the beam member of the strand reinforcing bar cage is designated. Can be held in position.

The movable member is a member parallel to the insertion direction of the strand reinforcing bar cage, and by moving the movable member, a non-movable member parallel to the movable member and fixed to the outer peripheral side of the frame body and the above. It is desirable that the diameter of the circumscribed circle including the movable member is expanded or contracted.
By reducing the diameter of the circumscribed circle including the non-movable member and the movable member, the frame body can be easily interpolated into the strand reinforcing bar cage. Further, if the diameter of the circumscribed circle including the non-movable member and the movable member is increased, the cross-sectional shape of the strand reinforcing bar cage can be reliably held in a circular shape between the non-movable member and the movable member.

The end support mechanism is fixed to a wire rod unwound from the beam member, a rotating jig provided at the end portion of the wire rod member, and an end portion of the strand reinforcing bar cage on the side far from the beam member. It is desirable that it consists of a frame material connected to a rotating jig.
By using such an end support mechanism, the rotation of the end on the side far from the beam member of the strand reinforcing bar cage is not hindered.

The second invention is an internal frame having a frame main body inserted in a strand reinforcing bar cage, a beam member fixed to one end of the frame main body, and the frame so that the distance from the frame main body is variable. A movable member that is connected to the main body and holds the cross-sectional shape of the strand rebar cage in a circular shape, and one end that is connected to the beam member and the other end that is detachable from the end of the strand rebar cage that is far from the beam member. A shape-retaining mechanism including an end support mechanism, a support column having one end fixed to the beam member and the other end connected to a carriage via a hinge portion, and the support column being rotated around the hinge portion. It is a device for building a strand reinforcing bar cage, which is characterized by having a means for raising it.

In the built-in device of the second invention, the support column fixed to the shape holding mechanism is rotated around the hinge portion while holding the shape of the strand reinforcing bar cage by using the shape holding mechanism of the first invention. As a result, the strand rebar cage can be raised from a horizontal state to a vertical state while preventing deformation of the cross-sectional shape of the strand rebar cage.

The third invention is an internal frame having a frame main body inserted in the strand reinforcing bar cage, a beam member fixed to one end of the frame main body, and the frame so that the distance from the frame main body is variable. A movable member that is connected to the main body and holds the cross-sectional shape of the strand rebar cage in a circular shape, and one end that is connected to the beam member and the other end that can be attached to and detached from the end of the strand rebar cage that is far from the beam member. A shape-retaining mechanism including an end support mechanism, a strut in which one end is fixed to the beam member and the other end is connected to a carriage via a hinge portion, and the strut is rotated around the hinge portion. A step a of inserting the frame main body in a horizontally arranged state into the strand reinforcing bar cage by using a building device including an upright means, and the movable member so that the distance becomes large. In the step b of moving to hold the cross-sectional shape of the strand rebar cage in a circular shape and attaching the other end of the end support mechanism to the end of the strand rebar cage on the side far from the beam member, and the erecting means. The step c of raising the frame body in the vertical direction by rotating the support column and arranging the strand reinforcing bar cage on the pile hole, and extending the strand reinforcing bar cage into the pile hole to support the end portion. A method for building a strand rebar cage, which comprises a step d of disconnecting the beam member and the end portion of the strand rebar cage on the side far from the beam member by a mechanism.

In the third invention, the frame body is raised from the horizontal state to the vertical state while maintaining the cross-sectional shape of the strand reinforcing bar cage by using the building device of the second invention, and the strand reinforcing bar cage is placed in the pile hole. To extend to. As a result, the strand reinforcing bar cage can be raised upright and smoothly extended into the pile hole while preventing the cross-sectional shape of the strand reinforcing bar cage from being deformed.

It is desirable to move the dolly to the vicinity of the pile hole between the step b and the step c.
Thereby, after inserting the strand reinforcing bar cage into the shape holding mechanism in a place where a sufficient working space can be secured, the strand reinforcing bar cage can be moved to the vicinity of the pile hole.

According to the present invention, a shape-retaining mechanism capable of holding the shape of a strand rebar cage and preventing deformation when standing up from a horizontal state to a vertical state, a strand rebar cage building device, and a method for building a strand rebar cage. Can be provided.

The figure which shows the building-in device 1. The figure which shows the state before installing the strand reinforcing bar cage 27 in the building-in device 1. The figure which shows the state which installed the strand reinforcing bar cage 27 in the building-in device 1. The figure which shows the state which arranged the strand reinforcing bar cage 27 on the pile hole 33. The figure which shows the state which started the extension of the strand reinforcing bar cage 27. The figure which shows the state which the extension of the strand reinforcing bar cage 27 is completed. The figure which shows the state which replaced the strand reinforcing bar cage 27 with the hanging reinforcing bar 37. The figure which shows the state which retracted the building-in device 1.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing a built-in device 1. 1 (a) is a side view of the built-in device 1, and FIG. 1 (b) is an elevational view of the built-in device 1 as viewed from the right side of FIG. 1 (a).

FIG. 2 is a diagram showing a state before installing the strand reinforcing bar cage 27 in the building device 1. FIG. 2A is a side view of the building device 1 and the strand reinforcing bar cage 27, and FIG. 2B is a view of the strand reinforcing bar cage 27 viewed from the right side of FIG. 2A.

FIG. 3 is a diagram showing a state in which the strand reinforcing bar cage 27 is installed in the building device 1. FIG. 3A is a side view of the building-in device 1 and the strand reinforcing bar cage 27, and FIG. 3B is a view of the building-in device 1 and the strand reinforcing bar cage 27 viewed from the right side of FIG. 3A.

As shown in FIGS. 2 and 3, the PC steel stranded wire or the like, which is the main bar, and the band bar are connected so that the main bar can rotate with respect to the band bar, and the main bar is spiraled. As a result, the bar arrangement interval of the band muscles is shortened and reduced. The strand reinforcing bar cage 27 is extended by widening the bar arrangement interval of the band bar by straightening the main bar. A reinforcing steel material 29 for stiffening is arranged inside the strand reinforcing bar cage 27.

As shown in FIGS. 1 to 3, the built-in device 1 includes a shape holding mechanism 3, a support column 9, a cylinder 13, a winch 15, a wire rope 17, a bogie 23, and the like.

The shape holding mechanism 3 includes an interpolating frame 5, a movable member 7a, a non-movable member 7b, an end support mechanism 31 (see FIG. 2B), and the like. Further, as shown in FIG. 1A, the interpolating frame 5 includes a frame body 5a inserted into the strand reinforcing bar cage 27 and a beam member 5b fixed to one end of the frame body 5a. The frame body 5a is longer than the length when the strand reinforcing bar cage 27 is contracted.

The movable member 7a is a member parallel to the insertion direction of the strand reinforcing bar cage 27, that is, the length direction of the frame body 5a of the insertion frame 5, and the pin 7c (FIG. 1 (b)) is on the lower surface side of the frame body 5a in a horizontal state. )). The non-movable member 7b is a member parallel to the movable member 7a and is fixed to the upper surface side of the frame body 5a in a horizontal state. The movable member 7a and the non-movable member 7b are, for example, steel materials having a circular cross section.

The diameter of the circumscribed circle including one movable member 7a and two non-movable members 7b is such that the movable member 7a is rotationally moved around the pin 7c to change the distance of the movable member 7a from the frame body 5a. Scale by. That is, in FIG. 3B, when the movable member 7a is in the position indicated by the dotted line, the diameter of the circumscribed circle is reduced, and when the movable member 7a is in the position indicated by the solid line, the diameter of the circumscribed circle is reduced. It is in a state of being expanded. The movable member 7a is provided with a fixing device (not shown) for fixing the distance from the frame body 5a (the position of the movable member 7a).

As shown in FIGS. 3A and 3B, the end support mechanism 31 includes a wire rope 17, a chain fixing frame 31a, a chain 31b, and a rotary jig 31c. The wire rope 17 is a wire rod that is connected to the beam member 5b of the interpolation frame 5 and unwound from the beam member 5b. The chain fixing frame 31a is a frame material fixed to the reinforcing steel material 29 at the end (see FIG. 3) on the side far from the beam member 5b of the strand reinforcing bar cage 27 into which the frame body 5a is inserted. The rotary jig 31c is provided at the end of the wire rope 17. One end of the chain 31b is attached to and detached from the rotating jig 31c, and the other end is attached to and detached from the chain fixing frame 31a. The chain 31b is connected to the rotary jig 31c by, for example, a lock mechanism (not shown) that can be remotely controlled.

The reinforcing steel material 29 is formed by processing shaped steel into a circular shape, and is arranged in a plurality of stages in the strand reinforcing bar cage 27. As shown in FIG. 3B, the inner diameters of the plurality of reinforcing steel materials 29 are the movable member 7a and the non-movable member 7a in a state where the diameter of the circumscribed circle including the one movable member 7a and the two non-movable members 7b is expanded. It is preferable that the member 7b is unified so as to hold the plurality of reinforcing steel materials 29 with the same force.

As shown in FIG. 1, one end of the support column 9 is fixed to the beam member 5b of the insertion frame 5 of the shape holding mechanism 3. The other end of the support column 9 is connected to the carriage 23 via the hinge portion 11. A support base 10, which is a member in a direction orthogonal to the support column 9, is fixed to the end portion of the support column 9 on the hinge portion 11 side.

The cylinder 13 is a raising means for rotating the support column 9 around the hinge portion 11. One end of the cylinder 13 is connected to the carriage 23 by a pin 13a, and the other end is connected to the support column 9 by a pin 13b.

The winch 15 is installed on the carriage 23. The wire rope 17 connected to the end support mechanism 31 is turned around by the pulley 19b provided on the beam member 5b, hooked on the pulley 19a provided on the carriage 23, and connected to the winch 15. Wheels 25 are provided on the carriage 23.

Next, a method of building the strand reinforcing bar cage 27 will be described.

In order to build the strand reinforcing bar cage 27, the building device 1 is arranged near the storage location of the strand reinforcing bar cage 27. At this time, as shown in FIG. 1A, the frame body 5a of the interpolating frame 5 of the built-in device 1 is arranged in the horizontal direction, and the columns 9 are arranged with the hinge portion 11 and the gantry 21 installed on the carriage 23. Support with. Further, as shown in FIG. 1B, the distance between the movable member 7a of the building device 1 and the frame body 5a is reduced, and the position of the movable member 7a is fixed by the fixing device (not shown) described above.

Then, as shown in FIG. 2A, a crane hanging jig 26 (not shown) is passed through the inside of the strand reinforcing bar cage 27 in a contracted state, and the strand reinforcing bar cage 27 is suspended. At this time, as shown in FIG. 2B, the reinforcing steel material 29 is integrated with the reinforcing steel material 29 at the right end of the strand reinforcing bar cage 27 shown in FIG. 2A, and the end is supported by the reinforcing steel material 29. The chain fixing frame 31a of the mechanism 31 is fixed.

Next, the strand reinforcing bar cage 27 suspended by the hanging jig 26 is moved in the direction of the arrow shown in FIG. 2, and as shown in FIG. 3, the frame body 5a in a horizontally arranged state is moved to the strand reinforcing bar cage. Interpolate to 27. Then, the hanging jig 26 is pulled out from the strand reinforcing bar cage 27.

After inserting the frame body 5a into the strand reinforcing bar cage 27, the position of the movable member 7a is released from being fixed. Then, as shown in FIG. 3B, the movable member 7a is rotationally moved around the pin 7c to increase the distance of the movable member 7a from the frame body 5a, and the movable member 7a is moved by the fixing device (not shown) described above. Fix it in the rear position. As a result, the diameter of the circumscribed circle including one movable member 7a and two non-movable members 7b is expanded to the same extent as the inner diameter of the reinforcing steel material 29 arranged inside the strand reinforcing bar cage 27, and the movable member 7a and the movable member 7a The non-movable member 7b holds the cross-sectional shape of the strand reinforcing bar cage 27 in a circular shape. At this time, the movable member 7a and the non-movable member 7b are not strongly pressed against the inner peripheral surface of the reinforcing steel material 29.

Further, the chain 31b of the end support mechanism 31 is attached to the chain fixing frame 31a fixed to the end of the strand reinforcing bar cage 27 on the side far from the beam member 5b, that is, the right end shown in FIG. 3A. As a result, the position of the end portion of the strand reinforcing bar cage 27 on the side far from the beam member 5b is maintained.

Next, the carriage 23 of the building device 1 is run to move from the vicinity of the storage location of the strand reinforcing bar cage 27 to the vicinity of the pile hole 33. A rail (not shown) is laid on the ground 2 from the vicinity of the storage location of the strand reinforcing bar cage 27 to the vicinity of the pile hole 33, and the carriage 23 runs on the rail by being towed by, for example, a winch (not shown). When the wheels 25 of the carriage 23 reach a predetermined position on a rail (not shown), the movement is completed and the position of the building device 1 is fixed. The carriage 23 has a notch at a position corresponding to at least directly above the pile hole 33 in a state of reaching a predetermined position shown in FIG.

FIG. 4 is a diagram showing a state in which the strand reinforcing bar cage 27 is arranged on the pile hole 33. After moving the building device 1 to the vicinity of the pile hole 33, as shown in FIG. 4, the cylinder 13 is extended and the support column 9 is rotated around the hinge portion 11 to raise the frame body 5a in the vertical direction. The strand reinforcement cage 27 is placed on the pile hole 33. At this time, the support base 10 contacts the upper surface of the carriage 23 to support the support column 9.

FIG. 5 is a diagram showing a state in which the extension of the strand rebar cage 27 is started, and FIG. 6 is a diagram showing a state in which the extension of the strand rebar cage 27 is completed. After the strand rebar cage 27 is placed on the pile hole 33, the wire rope 17 is unwound using the winch 15 and the strand rebar cage 27 is hung to a predetermined depth of the pile hole 33 as shown in FIG. Then, the position of the upper end of the strand reinforcing bar cage 27 is fixed by connecting the upper end of the strand reinforcing bar cage 27 and the beam member 5b of the interpolation frame 5 with the chain 35. At this time, the weight of the strand reinforcing bar cage 27 is mainly supported by the beam member 5b via the end support mechanism 31.

After fixing the position of the upper end of the strand reinforcing bar cage 27 with the chain 35, the wire rope 17 is further unwound. Since the lower end of the strand reinforcing bar cage 27 is connected to the rotating jig 31c via the chain 31b, when the wire rope 17 is further unwound with the upper end fixed, the lower end side rotates and the inside of the pile hole 33 due to its own weight. It will be extended to. Then, when the main muscle becomes straight as shown in FIG. 6, the extension is completed. When the extension shown in FIG. 6 is completed, the weight of the strand reinforcing bar cage 27 is mainly supported by the beam member 5b via the chain 35.

Here, while the strand reinforcing bar cage 27 is extended, the diameter of the circumscribed circle including the movable member 7a and the non-movable member 7b of the movable member 7a of the shape holding mechanism 3 is arranged inside the strand reinforcing bar cage 27. It remains fixed at a position equivalent to the inner diameter of the reinforcing steel material 29. As described above, since the movable member 7a and the non-movable member 7b are not strongly pressed against the inner peripheral surface of the reinforcing steel material 29, a force acts on the strand reinforcing bar cage 27 from the movable member 7a and the non-movable member 7b during extension. There is nothing to do. Therefore, the strand reinforcing bar cage 27 is smoothly extended while the cross-sectional shape is maintained by the shape holding mechanism 3.

FIG. 7 is a diagram showing a state in which the strand reinforcing bar cage 27 is replaced by the suspension reinforcing bar 37, and FIG. 8 is a diagram showing a state in which the building device 1 is retracted. When the extension of the strand reinforcing bar cage 27 is completed, the chain 31b is removed from the rotating jig 31c by remotely controlling the lock mechanism (not shown), whereby the beam member 5b by the end support mechanism 31 and the lower end portion of the strand reinforcing bar cage 27 are removed. Release the connection with. Then, the wire rope 17 is wound up by the winch 15 and the rotating jig 31c is collected from the inside of the pile hole 33. The chain 31b is left in the pile hole 33 together with the strand reinforcing bar cage 27 while being connected to the chain fixing frame 31a.

Further, the movable member 7a is moved in a direction approaching the frame body 5a to reduce the diameter of the circumscribed circle including the movable member 7a and the non-movable member 7b. Then, the strand reinforcing bar 27 is replaced by the hanging reinforcing bar 37 provided at the upper end of the strand reinforcing bar cage 27, the chain 35 shown in FIG. 6 is removed, and the strand reinforcing bar cage 27 is suspended in the pile hole 33. As shown, the hanging reinforcing bar 37 is supported by a basket 39 provided on the ground 2.

Next, by contracting the cylinder 13 and rotating the support column 9 around the hinge portion 11, the frame body 5a is laid down in the horizontal direction as shown in FIG. Then, the position of the building device 1 is released from being fixed, and the carriage 23 is run to retract from the vicinity of the pile hole 33.

As described above, in the present embodiment, the distance of the movable member 7a from the frame main body 5a is reduced, and the diameter of the circumscribed circle including the movable member 7a and the non-movable member 7b is reduced, thereby forming the frame in the strand reinforcing bar cage 27. The main body 5a can be smoothly inserted. Further, by increasing the distance of the movable member 7a from the frame body 5a and increasing the diameter of the circumscribed circle including the movable member 7a and the non-movable member 7b, the movable member 7a and the non-movable member 7b are formed into a strand reinforcing bar cage. The cross-sectional shape of 27 can be kept circular.

In the present embodiment, by holding the cross-sectional shape of the strand reinforcing bar cage 27 by using the shape holding mechanism 3 of the building-in device 1, the strand reinforcing bar cage 27 is raised from a horizontal state to a vertical state, or a pile hole 33. It is possible to prevent the strand reinforcing bar cage 27 from being deformed when it is extended inward. Further, by connecting the beam member 5b and the lower end portion of the strand reinforcing bar cage 27 by using the end support mechanism 31 having the rotating jig 31c, the lower end portion is supported while supporting a part of the own weight of the strand reinforcing bar cage 27. It can be rotated to smoothly extend the long strand rebar cage 27.

Although preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modified examples or modified examples within the scope of the technical idea disclosed in the present application, and these also naturally belong to the technical scope of the present invention. Understood.

For example, the shape holding mechanism 3 may have a movable member 7a on the outer peripheral side of the frame body 5a, and installation of the non-movable member 7b is not essential. Further, the movable member 7a may be connected to the frame body 5a so that the distance from the frame body 5a is variable. In the present embodiment, the movable member 7a is rotationally moved by the pin 7c, but the movable member 7a may be slidably moved to change the distance from the frame body 5a.

The configuration of the end support mechanism 31 is not limited to that described above, and may be any structure that does not hinder the rotation of the lower end portion of the stretched reinforcing bar cage 27 in the raised state. Further, the building means for raising the support column 9 by rotating is not limited to the cylinder 13, and the interpolation frame 5 may be lifted by a crane or the like.

The carriage 23 is not towed on a rail (not shown) and may be self-propelled. Further, a spacer is provided in advance on the outer peripheral surface of the strand reinforcing bar cage 27, and when the strand reinforcing bar cage 27 is hung in the pile hole 33 and extended, the position of the strand reinforcing bar cage 27 with respect to the pile hole 33 in a plan view is determined by the spacer. You may decide.

1 ………… Built-in device 2 ………… Ground 3 ………… Shape retention mechanism 5 ………… Insert frame 5a ………… Frame body 5b ………… Beam member 7a ………… Movable member 7b ………… Non-movable Members 7c, 13a, 13b ……… Pin 9 ………… Support 10 ………… Support stand 11 ………… Hing part 13 ………… Cylinder 15 ………… Winch 17 ………… Wire rope 19a, 19b ………… Pulley 21 ………… Stand 23 ………… Winch 25 ………… Wheels 26 ………… Hanging jig 27 ………… Strand rebar cage 29 ………… Reinforcing steel material 31 ………… End support mechanism 31a ………… Chain fixing frame 31b ………… Chain 31c ………… Rotating jig 33 ………… Pile hole 35 ………… Chain 37 ………… Suspended rebar 39 ………… Kanzashi

Claims (6)

A mechanism for maintaining the shape of the strand rebar cage,
An interpolated frame having a frame body to be inserted into the strand reinforcing bar cage and a beam member fixed to one end of the frame body.
A movable member that is connected to the frame body so that the distance from the frame body is variable and holds the cross-sectional shape of the strand reinforcing bar cage in a circular shape.
An end support mechanism in which one end is connected to the beam member and the other end can be attached to and detached from the end of the strand reinforcing bar cage on the side far from the beam member.
A shape-retaining mechanism characterized by being provided with. The movable member is a member parallel to the insertion direction of the strand reinforcing bar cage.
The claim is characterized in that, by moving the movable member, the diameter of the circumscribed circle including the non-movable member parallel to the movable member and fixed to the outer peripheral side of the frame body and the movable member is expanded or contracted. 1. The shape holding mechanism according to 1. The end support mechanism
The wire rod unwound from the beam member and
A rotating jig provided at the end of the wire and
A frame material fixed to the end of the strand reinforcing bar cage on the side far from the beam member and connected to the rotating jig, and
The shape-retaining mechanism according to claim 1 or 2, wherein the shape-retaining mechanism comprises. An internal frame having a frame main body inserted in a strand reinforcing bar cage and a beam member fixed to one end of the frame main body is connected to the frame main body so that the distance from the frame main body is variable. A movable member that holds the cross-sectional shape of the strand rebar cage in a circular shape, and an end support mechanism that is connected to the beam member at one end and the other end is removable to the end of the strand rebar cage on the side far from the beam member. Shape retention mechanism consisting of
One end is fixed to the beam member, and the other end is connected to the bogie via a hinge portion.
A raising means for rotating the support column around the hinge portion, and
A device for building a strand rebar cage, which comprises. An internal frame having a frame main body inserted in a strand reinforcing bar cage and a beam member fixed to one end of the frame main body is connected to the frame main body so that the distance from the frame main body is variable. A movable member that holds the cross-sectional shape of the strand rebar cage in a circular shape, and an end support mechanism that is connected to the beam member at one end and the other end is removable to the end of the strand rebar cage on the side far from the beam member. Shape retention mechanism consisting of
One end is fixed to the beam member, and the other end is connected to the bogie via a hinge portion.
A raising means for rotating the support column around the hinge portion, and
Using a built-in device equipped with
Step a of interpolating the frame body arranged in the horizontal direction into the strand reinforcing bar cage,
The movable member is moved so as to increase the distance to hold the cross-sectional shape of the strand reinforcing bar cage in a circular shape, and the other end of the end support mechanism is attached to the end portion of the strand reinforcing bar cage on the side far from the beam member. Step b and
The step c of raising the frame body in the vertical direction by rotating the support column by the raising means and arranging the strand reinforcing bar cage on the pile hole.
A step d of extending the strand reinforcing bar cage into the pile hole and releasing the connection between the beam member by the end support mechanism and the end portion of the strand reinforcing bar cage on the side far from the beam member.
A method of building a strand reinforcing bar cage, which is characterized by being provided with. The method for building a strand reinforcing bar cage according to claim 5, wherein the carriage is moved to the vicinity of the pile hole between the step b and the step c.

Images