JP3425352B2 - Self-elevating formwork device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-propelled formwork apparatus used in slipform construction method and jumping foam construction method, and more particularly, to a formwork apparatus capable of raising a reaction force to an outer side of an existing concrete skeleton. Regarding

[0002]

2. Description of the Related Art As a means for constructing tubular structures such as high-rise bridge piers and chimneys, main towers of suspension bridges and cable-stayed bridges, slip-form construction methods using self-propelled formwork equipment or jumping foam construction methods have been adopted. ing. In these construction methods, concrete is placed between a pair of molds supported by the yoke, and the hydraulic jack is raised to raise the yoke, demold the formwork, and further place concrete on top of it. By repeating this process continuously, it is possible to save labor in the troublesome work of changing the formwork.

In a conventional lifting mechanism using this hydraulic jack, for example, as shown in FIG. 4, a reaction beam 3 is arranged at the top end of a hollow steel pipe 2 buried in the center of a structural body 1, and this reaction beam is used. The wire 4 hung at both ends of the yoke 3 is inserted into the reaction force jack 6 provided on the yoke 5 side to support the yoke 5,
At the time of ascent, the respective reaction force jacks 6 are operated to be jacked up to exert a reaction force on the reaction force beam 3 to raise the yoke 5. In the figure, reference numeral 7 is a formwork supported inside the yoke 5, concrete C is placed inside the formwork 7, reinforcing bars are laid on the upper part of the formwork C, and then the yoke 5 is attached to the formwork. The structure skeleton 1 is sequentially constructed upward by raising it by a mechanism.

As another conventional raising mechanism, although not illustrated, a raising jack is installed at the top end of the concrete frame after construction is completed, and the formwork device supported by the raising mechanism is driven to raise the jack. There is also a structure in which a reaction force jack is inserted into the main structure bar and a reaction force is applied to the main bar to raise the formwork device.

However, the above-mentioned various conventional techniques have the following technical problems.

[0006]

First, in the conventional structure shown in FIG. 4, as the structure becomes larger, it takes time and cost to prevent the buckling of the steel pipe 2 supporting the reaction beam 3. Also,
Since a large heavy machine is required for attaching the reaction beam 3 and the wire 4, it takes time to attach or remove the heavy equipment. Furthermore, the structure body can be implemented only in a structure in which the hollow steel pipe 2 is incorporated.

On the other hand, in the structure in which the jack is mounted on the concrete frame to raise the formwork, the formwork device cannot be raised until the desired concrete strength is obtained, although it is not affected by the shape of the structure body. This will cause a delay in the work process.

Further, in the structure in which the reaction force is applied to the main rebar of the structure, although it is not influenced by the concrete strength, there is a limit to the stress applied to the main rebar when the formwork is raised, so that the apparatus cannot be increased in size.

In addition, since the reaction force beam is located inside the body, the reaction force beam and the main structure bar interfere with the workability during the work such as arranging work, and the workability is poor. The form cannot be wrapped endlessly.

The present invention is intended to solve the above technical problems, and its purpose is to eliminate the need for a reaction beam and the like, to have no structural limitation of the structure skeleton, and to depend on the strength development of skeleton concrete. The present invention provides a self-elevating formwork device that can be made larger without any need.

[0011]

In order to achieve the above-mentioned object, the present invention has a yoke arranged around the structure body and fixed to the inside of the yoke, and conforms to the outer peripheral shape of the body. A slide type frame formed in an inner surface shape, a jack support frame fixedly arranged at the lower part of the yoke and surrounding the skeleton, and arranged inside the jack support frame and detachably arranged on the outer side of the skeleton. A plurality of tightening jacks, a second jack support frame that is vertically coupled to the lower part of the jack support frame through a plurality of lift jacks, and surrounds the skeleton, and is located inside the second jack support frame. Te, wherein the plurality of clamping jacks are disjunctive capable disposed outside of the skeleton, a JiNoborushiki mold apparatus provided with a capital, before
The tightening jack is designed so that the self-propelled mold
The feature is that the device can be fixed around the body.
To collect .

Therefore, according to the present invention, when the mold is raised, the tightening jack of the second jack supporting frame is first separated from the body, and then the raising jack is contracted, so that the second jack supporting frame is raised. To do. At this stage, the tightening jack of the second jack support frame is pressed again on the outer side of the body. In this state, the tightening jack of the jack supporting frame is separated from the body, and then the raising jack is extended, and the yoke and the frame supported by the yoke are raised by the raising stroke of the raising jack. In the raised position,
Tightening the jack support frame By pressing the jack against the body, the entire device is re-fixed in the raised position, and the next concrete pouring is possible.

After the construction is completed, the device can be lowered in the order of jack strokes one after another by the procedure opposite to the above, and the dismantling and removal on the ground can be performed.

Further, in the present invention, a support bar projecting outward is disposed at the center of each side on the four outer surfaces of each jack support frame, and the tip of each support bar has both ends of each side. By suspending the PC steel wires fixed at both ends in the corners with a required tension to form a reaction force receiving material for the tightening jacks, the stress in the spreading direction of each jack support frame due to the reaction force of each tightening jack is absorbed. It is possible to secure a sufficient tightening force for the body.

[0015]

Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

1 and 2 show a self-elevating formwork apparatus in which the present invention is applied to construct a tubular structure such as a high pier in which a hollow steel pipe is integrally embedded. In the figure, the structure frame 10
Embedded therein hollow steel pipes 12 in two horizontal rows and three vertical rows, and arranged a large number of vertical streaks 14 in the peripheral portion.
Constructed by placing concrete C by the formwork device 18 while winding the PC strand 16 around the outer circumference of 4, and repeating the work of raising the jack stroke by the jack stroke from the ground portion to the top of the steel pipe 12. To be done.

The device 18 includes a yoke 20 which is arranged so as to surround the body 10, and a slide type frame 22 which is fixedly arranged inside the yoke 20 and has an inner surface shape which matches the outer peripheral shape of the body 10. , A jack support frame 24 that is fixedly arranged at the lower portion of the yoke 20 and surrounds the periphery of the skeleton 1, and is connected to the lower portion of the jack support frame 24 so as to be able to move up and down via a number of rising jacks 26, and also surrounds the periphery of the skeleton 10. The second jack support frame 28 and the respective jack support frames 24, 2
A plurality of tightening jacks 30, which are fixedly arranged on the inner side of 8 and face the side surface of the skeleton 10 so as to be separably contactable with each other, and the entire device 18 is fixed around the skeleton 10 by each jack 30.

The side surface portions of the jacks 30 contacting each other are the portions where already existing concrete has already hardened and sufficient concrete strength has been developed.
The device 18 can be fixed to the periphery of the skeleton 10 by sufficient clamping pressure without deformation on the 0 side. Further, the number of the tightening jacks 30 arranged is set so as to be the total jack pressure capable of supporting the entire load of the device 18 even with the jack supporting frames 24 and 28 alone.

In addition to the above, an upper working floor 32 is provided on the upper portion of the yoke 20. On the working floor 32, the work of adding the vertical streaks 14 and the traveling on the rail formed on the working floor 32 are performed. The strand winding vehicle 34 is used to wind the PC strand 16 before the concrete is placed.
Alternatively, it can be done in parallel with the placing work.

A lower work floor 36 is arranged on each of the jack support frames 24 and 28 so that various work can be performed. Further, as shown in FIG. 2, a support bar 38 projecting outward is disposed at the center of each side on the four outer side surfaces of each jack support frame 24, 28.
At the tip of each support bar 38, PC steel wire 40 fixed at both ends to both corners of each side is suspended by a required tension.
By using the steel wire 40 as the reaction force receiving member of the tightening jack 30, the stress in the spreading direction of the respective jack support frames 24, 28 due to the reaction force of each tightening jack 30 is absorbed, and a sufficient tightening force for the skeleton 10 is obtained. Has been secured.

It should be noted that a jack is provided in the horizontal direction between the base end portion of the jack support frame 28 and the support bar 38, and the support bar 38 is projected forward by this jack so that the PC steel wire 4
You can also strain 0. A turnbuckle may be used instead of the jack.

Next, the skeleton 1 using the formwork device 18 described above is used.
The construction method of 0 will be described with reference to FIG. First, FIG. 3 (a)
Shows a state in which concrete C is placed in the form 22. After the placing, when the concrete strength is sufficiently developed, as shown by the arrow, the tightening jack 30 in the second jack support frame 28 is separated from the skeleton 10,
Next, as shown by the arrow, the second jack support frame 28 is raised by contracting the raising jack 26.

At this raised position, the tightening jack 30 is again brought into contact with the skeleton body 10 as shown by the arrow in FIG. 3 (b). After this, as shown by the arrow, the jack support frame 24
By separating the tightening jack 30 on the side from the body 10, the load of the entire device 18 is received by the second jack support frame 28 side.

Immediately thereafter, as shown by the arrow, by extending the lifting jack 26, the yoke 20 is lifted by the jack stroke, the mold 22 is separated from the concrete pouring position, and the inside of the mold 22 and the existing structure are removed. A new space for placing concrete is formed with the top of the concrete.

After that, the tightening jack 30 on the side of the jack support frame 24 is projected and again pressed against the outer periphery of the skeleton 10, so that the entire apparatus 18 can be stably fixed.

After that, by repeating the work of raising the concrete alternately with the work of placing the concrete, the work of placing the concrete is repeated while sequentially raising the device 18,
The skeleton 10 is completed.

After the skeleton body 10 is completed, the device 18 can be dismantled and removed at the above-ground portion by lowering the device 18 in the shape of a scale insect by the procedure reverse to the above. Also, the device 1
By removing only the formwork 22 from 8, it can be diverted as a mobile support work for surface finishing after the completion of the skeleton.

In the present embodiment, the case where the formwork apparatus is applied to the construction of the tubular structure in which the hollow steel pipe 12 is embedded is shown. However, the hollow steel pipe is not embedded and only the reinforcing bar is formed into a tubular shape (hollow cylindrical shape). It is needless to say that the present invention can be applied to the construction of a structure (including a hollow polygonal shape).

[0029]

As is apparent from the above description, the self-elevating formwork apparatus according to the present invention has the advantages that reaction beams and the like are not required and there is no structural limitation on the structure body. Since dismantling and removal can also be done on the ground, removal work is easy.

Further, according to the present invention, since the apparatus can be moved and fixed by applying a reaction force to the side surface of the skeleton where strength has already been developed, the predetermined concrete construction procedure can be performed without being influenced by the time between strength development of skeleton concrete. You can do the work.

Further, when the skeleton becomes large, the number of tightening jacks and ascending jacks corresponding to the size may be arranged, so that the sizing can be sufficiently dealt with.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an overall configuration of a sliding formwork device to which the present invention is applied.

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

3 (a) and 3 (b) are explanatory views showing a jack-up procedure at the time of rising.

FIG. 4 is a side sectional view of a conventional self-elevating formwork apparatus using a reaction force beam.

[Explanation of symbols] 10 Structure skeleton 18 Self-raising formwork equipment 20 York 22 Sliding formwork 24 Tightening jack frame 26 lift jack 28 Second tightening jack frame 30 tightening jack 38 bar 40 PC steel wire

Claims (2)

(57) [Claims] 1. A yoke arranged around the structure frame, a slide type frame fixed to the inner side of the yoke and having an inner surface shape conforming to the outer peripheral shape of the frame, and a lower part of the yoke. A jack support frame that is fixedly arranged and surrounds the skeleton, a plurality of tightening jacks that are arranged inside the jack support frame and that can be separated from and contacted to the outer part of the skeleton, and a plurality of lifts at the bottom of the jack support frame. A second jack support frame that is vertically movable through a jack and surrounds the skeleton; and a plurality of second jack support frames that are located inside the second jack support frame and that can be attached to and detached from the outer part of the skeleton. clamping jack, a JiNoborushiki mold apparatus having a city, the jack tightening, the free-rise-type mold by the clamping pressure
That the frame device can be fixed around the body
A characteristic self-propelled formwork device . 2. A support bar projecting outward is arranged at the center of each side on the four outer surfaces of each jack support frame, and a tip of each support bar has both ends at both corners of each side. The self-elevating formwork apparatus according to claim 1, wherein the fixed PC steel wire is suspended by a required tension to be a reaction force receiving material of the tightening jack.