JPH08284406A - Slidable form device and slidable form construction method - Google Patents

Abstract

PURPOSE: To provide a shorter construction period and a lower construction cost by connecting an upper frame to a lower frame with a flexible member, setting up a sheating board with the inner and outer peripheries contacting with a concrete structure on an upper frame and freely making a working space. CONSTITUTION: A hydraulic jack 12 connected to the upper and lower frames 14, 11 is elongated to place concrete up to a sheathing board. After the concrete is hardened, a plural of column members are connected and fixed to the wall face of a concrete structure 20 between the frames 14, 11 for extension. A reinforcing bar unit 18 is suspended down to the upper end of the structure 20 and firmly welded to the upper end. The upper frame 14 is fixed to a column 10 and the lower frame 11 is released from fixture, and the upper end of the frame 11 is pulled up to the lower end of the frame 14 with the contraction of the jack 12. The lower frame 11 is fixed to the column 10 and the frame 14 is released from fixture and pushed up with the elongation of the jack 12. The steps of placing between the sheating boards with the inner and outer peripheries opposed each other for every elongation of the jack 12 is repeated to build up the structure 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding formwork apparatus and a sliding formwork method used for a structure of reinforced steel frame concrete or reinforced concrete.

[0002]

2. Description of the Related Art A sliding form method (slip form method) is known as a method of constructing a high pier, a chimney or a building core. In this construction method, as shown in FIG. 6, a formwork device 50 in which a dam plate 51, a support work 52, and a scaffold 53 are integrally fixed is used. That is, in this sliding formwork device 50, weir plates 51 are provided on both sides of a wall body 55 of a concrete structure to be constructed, and a supporting structure 52 is fixed on the outside of the weir plate 51 to support the both sides of the wall body. 52
Are connected to each other, a yoke member 54 is bridged above the wall of the concrete structure, and the scaffold 53 is fixed to the outside of the support work to form the scaffold 53. Then, when reinforcing bars 56 and steel frames are built in the space surrounded by the dam plate 51 of the sliding formwork device 50, concrete is placed therein, and when the concrete is hardened to the extent that it has a required compressive strength, this The weir plate 51 is cut off from the concrete, and the weir plate 51, together with the supporting members 52 and the scaffolds 53, is lifted by the jack 58 by applying a reaction force to the reaction force rod 57 embedded in the concrete. Repeatedly build a concrete structure.

[0003]

However, in the above-mentioned conventional sliding formwork method, the yoke material 54 laid over the wall body becomes an obstacle, and the working space for concrete placement and rebar assembly is restricted. There is a problem. In particular, when the core portion of the building is constructed, an opening form frame for forming the opening is attached, but the yoke material 54 also becomes an obstacle to the work at this time. Therefore, this yoke material 5
In order to avoid No. 4, the opening formwork is divided and attached, which causes a problem that it takes time and labor and the construction cost is increased.

Therefore, the present invention is intended to solve the above problems, and an object thereof is to eliminate the need for bridging a connecting member such as a yoke material above the wall of a concrete structure.
Therefore, a working space for placing concrete, assembling reinforcing bars and mounting formwork can be freely set, and a sliding formwork device and a sliding formwork method capable of improving the construction speed and reducing the construction cost can be provided. To provide.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above object, and its gist is to dispose the concrete structure independently on the inner and outer peripheries, and the inner and outer peripheries independently. A sliding formwork of a concrete structure, which can be operated as a pillar, and which is extended and fixed separately in the longitudinal direction of the inner circumference and the outer circumference of the concrete structure hardened to the extent that it has a required compressive strength. , A lower frame that is arranged so as to face the inner circumference and the outer circumference of the concrete structure and is detachably fixed to the pillar, and faces the inner circumference and the outer circumference of the concrete structure above the lower frame. Formed in a shape to be closed, connected to each lower frame by an elastic member that can expand and contract, and an upper frame removably fixed to the stanchions, so as to abut the inner and outer circumferences of the concrete structure, In sliding formwork device that includes a weir plate provided on the stage frame.

In the sliding formwork apparatus of the present invention, the columns are
The upper frame, the lower frame, the elastic member, the weir plate and other materials and the load of the worker can be supported, as long as it is a configuration that can resist the friction force received by the weir plate of the upper frame, for example, Rack and pinion rack (tooth bar), shaped steel or steel pipe in which multiple holes for inserting and removing pins are formed at predetermined intervals in the vertical direction, or multiple horizontal shaft members that can mesh gears or lock hooks Can be a long member in which are arranged in the vertical direction at a predetermined interval.

In the sliding formwork apparatus of the present invention, the upper frame is provided with a weir plate on the surface facing the concrete structure, contacts the wall surface of the concrete structure constructed by this weir plate, and through this weir plate. It may be formed in a shape that closes with sufficient strength so as to resist the lateral pressure and frictional force of the cast concrete that is transmitted, and may be formed in a frame shape similar to the cross-sectional shape of the concrete structure. Further, the upper frame may be provided with a supporting member for supporting the weir plate against the lateral pressure of the cast concrete,
Furthermore, scaffolding and handrails may be provided for the walking of workers. Furthermore, the upper frame is provided with a member that fits into the teeth of the rack, the holes of shaped steel or steel pipes, the horizontal shaft member of a long member, etc., which are exemplified in the above-mentioned support, as a means for removably fixing to the above-mentioned support. A device can be provided and such fittings can be, for example, gears or pins.

Further, in the sliding formwork apparatus of the present invention, the lower frame may be formed into a shape that closes like the upper frame, and therefore, it may be formed into a shape similar to the cross-sectional shape of the concrete structure. A scaffold or a handrail that allows workers to walk may be provided. Further, similarly to the upper frame, the lower frame can be provided with a means for detachably fixing to the column. Further, as described above, when the lower frame is formed in a closed shape, there is an advantage that the upper and lower frames can be easily interlocked with each other when the upper and lower frames are moved up and down by the elastic member.

Further, in the sliding formwork apparatus of the present invention,
The expansion / contraction member connects the upper frame and the lower frame, and by the expansion / contraction operation, a reaction force can be applied to one of the upper and lower frames to push up or pull up the other frame. It may be a hydraulic cylinder or a screw jack, for example. An appropriate number of such elastic members are arranged at appropriate positions between the upper and lower frames so that the upper and lower frames can be pushed up or pulled up.

Another subject of the present invention is a lower frame,
The lower frame is connected to the upper frame by a stretchable member, and the upper frame having a weir plate in contact with the concrete structure is separated by a predetermined distance so that the inner and outer circumferences of the concrete structure face each other. In addition to arranging, the upper frame is formed in a shape to be closed and arranged at the upper end of the concrete structure, and the columns are separately extended and fixed in the longitudinal direction of the inner and outer peripheries of the concrete structure, and the upper frame is fixed. The reaction force is applied to the support column, the expansion member is contracted to raise the lower frame, and before or after the step or steps, reinforcing bars and / or steel frames are erected on the upper end of the concrete structure, and the lower frame Then, a reaction force is applied to the column, the elastic member is stretched for a predetermined length to raise the upper frame, concrete is placed inside the upper frame, and after a predetermined time elapses. Similarly, the upper frame is raised by a predetermined length, concrete is placed, and thereafter, this process is repeated until the elastic member extends to the limit length, and the placed concrete has a required compressive strength or more. After being hardened, the pillar is extended and fixed between the upper and lower frames, and thereafter, the steps similar to the above steps are repeated on the hardened concrete structure. It is in the frame construction method.

In the sliding formwork method of the present invention, the above-mentioned sliding formwork device can be used.

[0012]

In the sliding formwork apparatus and the sliding formwork method of the present invention, the expansion and contraction means connecting the upper frame and the lower frame is extended by a predetermined length, and concrete is poured up to the upper end of the weir plate each time it is extended. , When the expansion means expands to the limit and the concrete hardens beyond the required compressive strength, at a predetermined interval in the vertical direction between the inner circumference and the outer circumference of the wall surface of the concrete structure located between the upper frame and the lower frame. Extends by connecting / fixing multiple column members. Simultaneously with or before or after the extension work of the support pillar, a lifting machine such as a crane is used to hang the rebar or steel frame on the upper end of the concrete structure, and the welding is fixed to the upper end. And
Next, the upper frame is fixed to the column, the lower frame is not fixed to the column, the expansion / contraction means is contracted, and the upper end of the lower frame is pulled up to the lower end of the upper frame.
After pulling up the lower frame, this time, fix the lower frame to the column, release the upper frame from the column, and apply reaction force to the column with the lower frame,
The upper frame is pushed up while extending the expansion / contraction means by a predetermined length. Then, in the same manner as described above, every time the expanding and contracting means extends, concrete is placed between the barrier plates facing each other on the inner circumference and the outer circumference, and thereafter, the above steps are repeated to construct a concrete structure.

[0013]

Embodiments of the sliding formwork apparatus and the sliding formwork construction method according to the present invention will be described in detail below with reference to the accompanying drawings. 1 is a perspective view showing a situation in which a concrete structure is constructed by applying the sliding formwork apparatus and the sliding formwork method of the present invention, and FIG. 2 is a cross-sectional view taken along one-dot chain line II-II in FIG. FIG. 3 is an enlarged perspective view of a column of the sliding form device, FIG. 4 is a cross-sectional view of a gear member that is freely attached to and detached from the column, and FIG. 5 is an explanatory diagram of the sliding form method. As shown in FIG. 1 and FIG. 2, the sliding formwork device 1 of the present invention mainly includes a column 10, a lower frame 11, a hydraulic jack 12 as an elastic member, a dam plate 13, and an upper frame 14. Prepare as a department.

Here, the column 10 is the hydraulic jack 1.
Strut members 10 'formed to have a length substantially equal to the expansion and contraction length of 2 are connected at both upper and lower ends to form a joint.
As shown in FIG. 3, this strut member 10 'has a long flat steel 10f and a length approximately the same as that of the flat steel 10f, and flanges are welded to both long sides of the flat steel 10f so that the webs face each other. Two groove-shaped steels 10e, a shaft member 10d that horizontally penetrates the web of the two grooved-shaped steels 10e, and a plurality of them are fixed at predetermined intervals, and is welded and fixed to the upper end portion of the flat steel 10f. An attachment plate 10a that abuts the wall surface of the concrete structure 20,
It is composed of a flat plate 10f and a fitting plate 10b having an L-shaped cross section, which is welded and fixed to the splicing plate 10a with a gap 10b 'between the flat steels 10f. The hole 10c is formed.

The column 10 is a column member 1 having such a structure.
0'is added at both upper and lower ends, and extended and fixed in the vertical direction of the inner and outer peripheral wall surfaces of the concrete structure 20 as shown in FIG. That is, the support member 10 ′ is the attachment plate 10
An anchor bolt (not shown) is inserted through a hole 10c formed in a, and the tip of the anchor bolt is a sea bolt 1 previously embedded in the wall of the concrete structure 20.
5 (see FIG. 2) and fix it. Then, when the lower end portion of the other strut member 10 ', that is, the lower end portion of the flat steel 10f is inserted into the gap 10b' of the fixed strut member 10 ', and the upper end portion is similarly fixed with anchor bolts, The column 10 can extend upward.

Further, the upper frame 14 is formed in a shape that is continuous along the outer circumference and the inner circumference of the wall of the concrete structure 20 having a rectangular cross section and is closed separately, that is, a rectangular frame shape. And are arranged so as to face each other on both sides of the wall body. Then, as its configuration, the wall surface of the concrete structure 20 is continuously abutted against each other,
The weir plate 14a formed so as to be closed, and this weir plate 14a
Weir plate 1 in contact with a and transmitting the lateral pressure of the cast concrete
Support member 14b for supporting 4a and this support member 14b
Scaffolding member 14 extending horizontally from the upper and lower ends of the
d, 14f, handrail members 14c, 14e formed by standing upright from these scaffold members 14d, 14f, and a supporting member 14b provided at the lower end portion, and freely attached to and detached from the shaft member 10d of the column member 10 '. And a gear member 17 (see FIG. 4). The gear member 17 is the support member 1
Roller 17b that rolls in the groove portion of two grooved steel 0e of 0 ', and gear 17a that freely attaches to and detaches from shaft member 10d.
And a gear mechanism (not shown) for fixing the gear 17a or releasing the fixation to rotate the gear 17a freely. Further, since the dam plate 14a is formed so as to be continuously closed, it is easy to resist the lateral pressure of the cast concrete, and further, the dam plate 1
Providing the support member 14b on 4a can improve the proof stress against lateral pressure.

Further, like the upper frame 14, the lower frame 11 is formed in a rectangular frame shape for the outer circumference and the inner circumference of the wall of the concrete structure 20 so as to face each other on both sides of the wall. Is located in. Then, the construction is such that the frame member 11e is formed so as to face the wall surface of the concrete structure 20 and is closed, and the scaffolding member horizontally extended from the upper end and the lower end of the frame member 11e. 11b and 11d and these scaffold members 14d and 1
A handrail member 11a formed by vertically rising from 4f,
11c, and a gear member 17 (see FIG. 4) provided at a position facing the column 10 of the frame member 11e and freely attached to and detached from the shaft member 10d of the column member 10 '.

Further, the hydraulic jack 12 includes the scaffolding member 14f of the upper frame 14 and the lower frame 11 described above.
A plurality of scaffold members 11b are provided at predetermined intervals between the scaffold members 11b.

Next, a method of constructing a concrete structure using the sliding formwork apparatus 1 having the above-mentioned structure will be described. As shown in FIG. 5 (a), the hydraulic jack 12 that connects the upper frame 14 and the lower frame 11 is extended to the limit, and concrete is placed up to the upper end of the weir plate 14a.
This concrete has the required compressive strength, for example 0.5-1.
When it is hardened to about 0 kg / cm ² or more, as shown in FIG. 5 (b), the concrete structure 20 located between the upper frame 14 and the lower frame 11 is vertically aligned with the inner and outer peripheries of the wall surface of the concrete structure 20. , A plurality of pillar members 10 'are connected and fixed at predetermined intervals and extended. At this time, the worker can work on the scaffolding member 11b of the lower frame 11.

Simultaneously with or before or after the extension work of the support column 10, a hoisting machine such as a crane is used to rebar unit 18,
That is, a reinforcing bar assembly formed by previously assembling vertical bars and horizontal bars is hung on the upper end 20 'of the concrete structure 20, and the lower end is joined to the reinforcing bar projecting from the upper end 20'. At this time, since the upper end portion 20 'of the concrete structure 20 is not provided with devices such as a yoke material, a reaction rod and a jack unlike the conventional sliding formwork method (slip form method), the rebar unit 18 It is possible to easily perform the hanging work and the joining work.

Next, the gear 17a of the gear member 17 provided on the upper frame 14 is fixed by meshing with the shaft member 10d of the column 10, and the fixation of the gear 17a of the lower frame 11 to the shaft member 10d is released. The hydraulic jack 12 is contracted, and the upper end of the lower frame 11 is pulled up to the lower end of the upper frame 14 as shown in FIG. 5 (c).

After the lower frame 11 has been pulled up, the gear 17a of the lower frame 11 is moved to the shaft member 1 this time.
0d, the gear 17a of the upper stage frame 14 is released from the shaft member 10d, and the gear 17a of the lower stage frame 11 applies a reaction force to the shaft member 10d.
2 is extended by a predetermined length (for example, about 5 cm) at a predetermined interval (for example, 10 minutes), and this is repeated to push up the upper frame 14 by a predetermined length (for example, about 30 cm) for a predetermined time (for example, between primary times). And the upper frame 1
Every time 4 rises for a predetermined length (for example, about 30 cm), concrete is poured into the space created between the barrier plates 14a facing each other on the inner circumference and the outer circumference. Then, the expansion of the hydraulic jack 12 is repeated again, and concrete pouring is performed every time the hydraulic jack 12 rises by a predetermined length (for example, about 30 cm), and thereafter, this is repeated until the hydraulic jack 12 reaches the limit length.

When this concrete is hardened to a required compressive strength, for example, 0.5 to 1.0 kg / cm ² or more, the pillar members 10 'shown in FIG. 5 (b) are connected and fixed in the same manner as above. From the process, concrete is placed between the dam plates 14a,
The process until the hydraulic jack 12 reaches the limit length is repeated to build a concrete structure.

In the sliding formwork method using the sliding formwork apparatus 1 of the present invention, since the upper end portion 20 'of the concrete structure 20 being constructed has no connecting member or the like and is open,
Large precast concrete slab 1 as shown in Figure 1
9 can also be built as it is, without being subdivided. Precast concrete plate 19 as such an embedded formwork
By using, it is possible to prevent water loss due to mold release from the mold and deterioration of concrete quality.

[0025]

According to the sliding formwork apparatus and the sliding formwork method of the present invention, the upper frame having the weir plate on the surface contacting the concrete structure is connected to the lower frame by the elastic member, and the upper frame and the lower frame are connected. Providing pillars on the wall of the concrete structure, which allows the frame to be detachably fixed,
Furthermore, since these structures are independently provided without being connected to the inner circumference and the outer circumference of the concrete structure, an obstacle such as a yoke material of a conventional sliding form machine is provided at the upper end of the concrete structure. It is possible to hang materials such as reinforcing bars and steel frames pre-assembled on the ground freely on this upper end, and to build them in large size without dividing these building materials into smaller ones. You can Therefore, the construction speed can be improved and the construction cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a concrete structure is constructed by applying a sliding form device and a sliding form method of the present invention.

2 is a cross-sectional view taken along the alternate long and short dash line II-II in FIG.

FIG. 3 is an enlarged perspective view of a column of the sliding formwork device of the present invention.

FIG. 4 is a cross-sectional view of a gear member that is freely attached to and detached from a column of a sliding formwork device of the present invention.

FIG. 5 is an explanatory view of the sliding formwork method of the present invention.

FIG. 6 is a cross-sectional view showing a conventional sliding form device and a sliding form method.

[Explanation of symbols]

 1 Sliding Formwork Device 10 Strut 11 Lower Frame 12 Hydraulic Jack (Expandable Member) 14 Upper Frame 14a Weirboard 20 Concrete Structure

Claims (2)

[Claims] 1. A sliding formwork for a concrete structure, which is arranged on the inner circumference and the outer circumference of a concrete structure independently of each other and is capable of operating the inner circumference and the outer circumference independently of each other. A pillar that is fixed by extending in the longitudinal direction of the inner circumference and the outer circumference of the concrete structure that has been hardened to the extent that it is fixed, and is arranged opposite to the inner circumference and the outer circumference of the concrete structure, and is attached to and detached from the pillar. A lower frame that is freely fixed, and is formed in a shape in which the inner circumference and the outer circumference of the concrete structure face each other and close above the lower frame, and the lower frame is connected to each lower frame by a stretchable elastic member, A sliding formwork device comprising: an upper frame detachably fixed to a column; and a dam plate provided on the upper frame so as to come into contact with an inner circumference and an outer circumference of the concrete structure. 2. An inner circumference of the concrete structure, wherein a lower frame and an upper frame having a weir plate which is connected to the concrete above the lower frame by a stretchable elastic member and has contact with the concrete structure are separated by a predetermined distance. And the outer circumference of the concrete structure are arranged to face each other, and the upper frame is formed in a shape to be closed, and is arranged at the upper end of the concrete structure, and columns are separately arranged in the longitudinal direction of the inner circumference and the outer circumference of the concrete structure. It is extended and fixed, the reaction force is applied to the pillar by the upper frame, the elastic member is contracted to raise the lower frame, and before or after the step or steps, a reinforcing bar and / or Alternatively, a steel frame is erected, a reaction force is applied to the column by the lower frame, the elastic member is extended for a predetermined length to raise the upper frame, and the concrete is placed inside the upper frame. In the same manner, after raising a predetermined length, the upper frame is raised for a predetermined length, concrete is placed, and thereafter, this process is repeated until the elastic member extends to the limit length. After the installed concrete is hardened to the extent that it has a required compressive strength or more, a pillar is extended and fixed between the upper and lower frames, and thereafter, on the hardened concrete structure, the above steps A sliding formwork method characterized by repeating similar steps.