JP2616376B2 - Work frame of slip form method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work table of a slip foam method.

[0002]

2. Description of the Related Art A work frame of the slip-form method is provided with a sliding formwork which is arranged so as to be able to ascend and descend around a structure to be constructed. The concrete is continuously poured by moving upward sequentially.

[0003] In the slip-form method, rebar is erected in a sliding formwork before concrete is poured. However, since concrete placement and rebar construction proceed simultaneously, work is performed on the upper part of the formwork. It is a common practice to integrate the gantry and to assemble the main reinforcement and the stirrup at this part.

[0004]

However, the assembling work is simple because the main reinforcing bar can be sequentially connected vertically to the upper portion of the already built main reinforcing bar. However, the stirrup crosses the many main reinforcing bars. Since it had to be assembled, the work was extremely troublesome.

[0005] Therefore, if the PC strand is used as a spiral muscle instead of the stirrup, and the spiral is continuously wound around the main muscle while being continuously fed out, the assembling work can be simplified. .

The present invention has been made based on the above point of view, and a purpose of the present invention is to provide a slip forming method suitable for automation and labor saving of a bar arrangement work in which a PC strand can be fed out in a loop around a main bar. A work platform is provided.

[0007]

In order to achieve the above object, the present invention is arranged so as to be able to ascend and descend around a structure to be constructed, and is provided integrally with a sliding form for concrete casting at a lower portion. A work platform of the slip-form method, a rail provided on the upper surface of the work platform, laid endlessly along the outer periphery of the structure to be constructed, a bogie traveling on the rail, and a rolling stock on the bogie. A drum movably disposed, and a pair of feed rollers for pinching and pulling out a drawn end of the PC strand wound on the drum on the carriage. is there.

[0008]

According to the above construction, the bogie travels around while pulling out the PC strand, whereby the PC strand is fed while the drum rolls. PC extended
By winding and arranging the strand around the main bar, it is wound in a loop around the main bar every turn of the bogie, and is assembled endlessly continuously around the main bar as the work platform rises Can be

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 and FIG. 2 show an overall configuration in which the present invention is applied to the construction of a pier. The pier in the figure is the foundation 1
A plurality of hollow steel pipes 2 arranged in accordance with the cross-sectional shape of the legs, and a steel pipe group 2A as a main structural material vertically connected to a required height, and an outer periphery of each hollow steel pipe 2. The leg body 4 is constituted by the concrete C to be buried integrally, the main reinforcing bar 3a and the PC strand 3b around each hollow steel pipe 2 and arranged on the surface side of the concrete C.

A large number of main reinforcements 3a are arranged before the concrete C is cast, and are erected around the outer periphery of the leg body 4. On the other hand, the PC strand 3b is wound around the outer side of the main muscle 3a to form a spiral muscle.

A work table 7 is suspended from a reaction table 6 disposed on the top of the group of steel pipes 2A via a suspending means W such as a PC steel wire, and concrete C is integrally formed inside a lower portion of the work table 7. Are continuously driven between the sliding molds 8 fixedly disposed at the center.

The sliding formwork 8 has an inner shape corresponding to the outer shape of the leg frame 4. The concrete form C is cast inside the formwork 8 and a jack or the like provided on the suspension means W is used for the sliding formwork 8. By raising the work platform 7 while applying a reaction force to the reaction force table 6, the solidified concrete C is sequentially released from the lower side of the formwork 11.

The work platform 7 is formed in two stages, and the upper platform 7
a is provided with a PC strand 3b feeding device according to the present invention, and the lower gantry 7b is provided with a P strand fed from the device side.
It functions as a frame for arranging and assembling the C strand 3b.

Further, the top of the upper frame 7a is
A support 7c is provided for supporting the concrete casting hose 9 suspended inward.

The feeding device for the PC strand 3b includes a pair of rails (rails) 10 laid around the upper surface of the upper pedestal 7a along the outer periphery of the leg frame 4 and a trolley circling on the rails 10 in one direction. 16 is provided.

FIGS. 3 to 5 show the detailed structure.
A trolley 16 is mounted on the rail 10 via wheels 14 so as to be able to travel. A pair of rolling rollers 18 are arranged on the front upper surface of the carriage 16, and a drum 20 is rotatably mounted above the rollers 18. Further, a bracket 22 is provided on the rear upper surface of the cart 16,
PC strand 3b fed from the drum 20
Are arranged, and a pair of feed rollers 24 for guiding to the drawer side are arranged.

The drum 20 is set on a bogie with the PC strand 3b wound thereon.
The drum 20 draws out the PC strand 3b while rotating on the roller 18 by being set on the roller 18 and pulling the drawn end of the PC strand 3b. The roller 18 is provided with a brake or the like (not shown), and the rotation of the drum 20 can be stopped by operating the brake if necessary. Then, the PC strand 3b is pulled out from the outside of the drum 20.

A guide rail 12 is laid at the center of the rail 10, and a traveling motor 26 is provided on the lower surface of the front side of the bogie 16 corresponding to the guide rail 12, and the output shaft is provided with the guide rail 12. The driving drive rubber roller 28 is in contact with the side surface of the guide rail 12, and the rubber roller 28 is disposed on the other side of the guide rail 12. A pair of pinch rollers 3 for preventing derailing, which are rolled in contact with both side surfaces of the guide rail 12, are provided on the lower surface of the rear portion of the carriage 16.
0 is provided.

Further, a power supply line 34 is laid on the upper pedestal 7a on the outer side of the rail 10 and a power supply device connected to the motor 26 side while slidingly contacting the power supply line 34 on the outer surface of the carriage 16. 36 are protruding.

In the above configuration, the main reinforcement 3a is successively connected to the upper side of the already built main reinforcement 3a by a connecting means such as mechanical or welding.

The main strand 3a of the PC strand 3b
Is carried out by pulling out the PC strand 3a fed by the feed roller 24 to the lower frame 7b side while running the cart 16 in one direction. By this pulling-out operation, the drum 20 is sequentially rotated on the roller 18 from outside thereof while the PC 20 is being rotated.
The strand 3b is paid out. The PC strand 3b pulled out from the outside of the drum 20 is less likely to be generated.

When the worker on the lower gantry 7b moves back along the running direction of the bogie 16 while positioning the outside of each main bar 3a while returning the twist of the drawer end, the PC strand 3b is shown in FIG. As described above, the bogie 16 is wound around the main bar 3a in a loop every one turn, and the end is appropriately tied to the main bar 3a using a tying line or the like in an endless manner as the work platform 7 rises. Finish the rebar arrangement and assembly work continuously.

Immediately before the PC strand 3b is unreeled to the terminal end, the carriage 16 stops running, the rotation of the drum 20 is stopped, and the truck 16 is lowered from above.
The work can be continued by replacing the new PC strand 3b with the wound drum 20, connecting the end and the start end of the PC strand 3b, and passing the start end of the new PC strand 3b through the feed roller 24.

The work of arranging the main reinforcing bar 3a, the arranging and assembling of the PC strand 3b, and the placing of the concrete C are continuously performed in synchronism with the ascending speed of the work stand 7, and the steel pipe group 2A When it is constructed up to the uppermost part, the leg body 4 is completed.

In the above embodiments, the present invention is applied to the construction of a bridge pier using hollow steel pipes.
Also, the winding operation can be automated.

[0027]

As described in detail in the above embodiments, in the work frame of the slip-form method according to the present invention, the PC strand is moved around the bogie so that the PC strands are moved every one round of the bogie. It can be wound in a loop around it and can be continuously wound around the main bar endlessly as the work platform rises, simplifying bar arrangement work and assembling work to the main bar. It is suitable for rebar arrangement, automation of assembly work, and labor saving.

[Brief description of the drawings]

FIG. 1 is a side view when the present invention is applied to the construction of a pier.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a plan view of a main part of the feeding device according to the present invention.

FIG. 4 is a sectional side view of the same.

FIG. 5 is a longitudinal sectional view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Foundation 3 Reinforcing bar 3a Main bar 3b PC strand 4 Leg body 7 Work frame 7a Upper frame 7b Lower frame 8 Sliding form 10 Rail (rail) 16 Dolly 20 Drum 24 Feed roller C Concrete

Continuation of the front page (72) Inventor Takayuki Sone 2-3-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (56) References (JP, U)

Claims (1)

(57) [Claims] 1. A work table of a slip-form method, which is arranged so as to be able to ascend and descend around a structure to be constructed, and which is integrally provided with a sliding form for concrete casting at a lower part thereof. A rail that is provided and laid in an endless manner along the outer periphery of the structure to be constructed, a bogie that runs on the rail, and a drum that is rollably disposed on the bogie,
A work table of a slip form method, comprising: a pair of feed rollers for pinching and pulling out a drawing end of a PC strand wound on the drum on the carriage.