JPH08135182A - Timbering sliding construction method - Google Patents

Abstract

PURPOSE: To allow a form device to be moved up without agitating the concrete surface, reduce ascending resistance to the form device and dispense with a large-scale jack device. CONSTITUTION: In this timbering sliding construction method, reinforcing bars 5 and/or steel frames are built up, and sheathing boards 9 are disposed at the outer periphery of the reinforcing bars 5 and/or steel frames. The sheathing boards 9 are supported by a timbering 10 through sliding members, and concrete is placed in a part surrounded by the sheathing boards 9. After the concrete is hardened to the extent of having required compressive strength, the sheathing boards 9 are left in the embedded state on the surface of a hardened concrete body 30, and the timbering 10 is moved up. Thereafter the same process is repeated on the hardened concrete body 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movable formwork method for concrete formwork, and more particularly, to a support slide construction method used for reinforced steel-framed concrete or reinforced concrete structures such as high piers and chimneys.

[0002]

2. Description of the Related Art A sliding formwork method is known as a construction method for constructing structures such as high piers and chimneys. This construction method uses a formwork device in which the dam plate, the support work, and the scaffold are integrally fixed. That is, this formwork device is
Each support is fixed, and the scaffold is fixed on the outside of this support. Then, when reinforcing bars and steel frames are built in the space surrounded by the dam plate of this formwork device, concrete is placed therein, and when the concrete is hardened to the extent that it has the required compressive strength, the dam plate is removed from this concrete. The barrier plate is cut off, and along with the support work and scaffolding, reaction force is applied to the reaction force rod embedded in the concrete to raise it with a jack, and the above steps are repeated to construct a structure.

[0003]

However, in the above-mentioned conventional sliding formwork method, the weir plate adhering to the concrete is cut off while being raised against the concrete adhering force, so that the ascending resistance is large, and Devices such as jacks are large and complicated. Further, when the weir plate is trimmed up, the surface of the concrete is disturbed by the weir plate, so that the concrete surface is finished to a rough surface, which is not aesthetically preferable.

Therefore, the present invention is intended to solve the above-mentioned problems, and an object of the present invention is to raise the formwork device without disturbing the concrete surface, and to reduce the lifting resistance to the formwork device. Another object of the present invention is to provide a supporting work slide construction method that can be performed and does not require a large-scale jack device.

[0005]

The present invention has been made in view of the above objects, and its gist is to install a reinforcing bar and / or a steel frame, and arrange a weir plate on the outer periphery of the reinforcing bar and / or the steel frame. , This dam plate is supported by the supporting work via a sliding member, and concrete is placed in a portion surrounded by the dam plate,
After this concrete is hardened to a degree having a required compressive strength or higher, the supporting plate is raised while leaving the dam plate embedded in the surface of the hardened concrete body, and thereafter,
A supporting slide construction method is characterized in that the same steps as above are repeated on a hardened concrete body.

In the supporting slide construction method of the present invention, it is possible to include a step of using a transparent plate as the barrier plate and visually inspecting the filling condition of the concrete cast inside the barrier plate by the operator. good. Here, as the transparent plate member, a transparent or translucent fiber-reinforced resin (hereinafter referred to as FRP) or an acrylic plate can be used.

In the supporting slide method of the present invention, to raise the supporting work means that the reaction force is applied to the steel rod or the steel frame embedded in the already-formed concrete body, and the supporting work is performed by the hydraulic jack, chain block or winch. May be raised or the supporting work may be hoisted by a crane or the like.

Further, in the supporting and sliding method of the present invention, as the concrete body (concrete structure) is constructed from the lower side to the upper side, the number of the weir plates may be increased or decreased or the shape of the weir plates may be changed. good. When the buried type weir plate is used in this way, the trouble of removing the weir plate is completely unnecessary, so concrete structures with complicated shapes such as curved surfaces,
Alternatively, a concrete structure whose cross-sectional shape changes from the lower side to the upper side can be easily formed.

[0009]

According to the supporting slide method of the present invention, a reinforcing bar is built on an already-formed concrete body, a see-through weir plate is arranged on the outer periphery of this reinforcing bar, and a sliding member is brought into contact with the supporting plate to carry out the supporting work. Support in. At this time, the barrier plate and the supporting structure supporting the barrier plate are not fixed, but are supported only by contact.

Next, concrete is poured into the portion surrounded by the dam plate. At the time of this placement, the concrete filling state is visually confirmed from the outside of the see-through weir plate, and if an air pocket is mixed in the concrete, it is removed by a vibrator or the like. When this concrete has hardened to the extent that it has the required compressive strength, a reaction force is applied to the reaction force rods embedded in the concrete body to apply upward force to the support work with a hydraulic jack, etc. Slides on the surface of the weir plate by the sliding member, while the weir plate is left embedded in the surface of the concrete structure, and the supporting work rises. After that, the concrete structure is completed by repeating the same steps as described above.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the supporting slide method according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a sectional view for explaining a supporting slide method of the present invention, and FIG. 2 is a cross-sectional line II-II of FIG.
FIG. 3 is a front view of the supporting unit 1 when viewed from the direction of FIG. 3, and FIG. 3A is an enlarged cross-sectional view of a dotted line portion III of FIG.
Further, FIG. 3 (b) is an enlarged view of the tip of the adjusting device 7 of FIG. 3 (a).

The support unit 10 used in the present invention is
As shown in FIG. 1, a first supporting member 1, connecting members 2a and 2b for connecting the first supporting members 1 on both sides thereof, and an adjusting device 7 inside each of the first supporting members 1. A second support 6 pivotally supported, and an upper scaffold 20, a middle scaffold 21, and a lower scaffold 22 fixed to the first support 1 are provided.

As shown in FIG. 2, the first supporting member 1 is formed by arranging two channel members or the like in parallel so as to form a gap 1b 'of about 20 mm to form a vertical member 1b. A vertical member 1f having a gap 1f ′ is formed from two channel members, and these vertical members 1b and 1f are arranged at a predetermined distance apart from each other. Lateral members 1a, 1c, 1 composed of
They are connected by d and 1e.

The second supporting member 6 is formed of a steel material such as a channel, and is fitted to two bolt shaft tip portions 7b (see FIG. 3 (b)) of an adjusting device 7 described later at two inner portions thereof. A bolt bearing portion 6a having a spherical concave portion is formed, and a sliding member is fixed to the outside (the side in contact with the dam plate 9). As this sliding member, as shown in FIG. 3 (a), a plate body 11 having a Teflon layer formed on the surface may be fixed to each of the second supporting members 6, or in FIG. 4 (a) (b). )
As shown in FIG. 3, the bearing piece 23 is fixed to the second support 6, and the rotary shafts 25 of the plurality of rollers 24 are fixed to the bearing piece 23.
It may be formed by axially stopping. The second supporter 6 having the above-described configuration is not fixed to the barrier plate 9 by any fixing means, and the second supporter 6 simply contacts the barrier plate 9 so that the second supporter 6 supports the barrier plate 9. I support you.

Further, as shown in FIGS. 3 (a) and 3 (b), the adjusting device 7 includes reinforcing plates 7d, having bolt holes, which are fixed to the lower two surfaces of the vertical members 1b, 1f, respectively.
7e, nuts 7c and 7f fixed to the reinforcing plates 7d and 7e, respectively, and bolts 7a screwed to penetrate the nuts 7c and 7f, the reinforcing plates 7d and 7e, and the gaps 1b 'and 1f'. , And a tip portion 7b of a bolt shaft 7a ′ formed in a spherical shape. The bolt shaft tip portion 7b is fitted into the bearing portion 6a formed on the second supporting member 6 to pivotally support the second supporting member 6.

In such an adjusting device 7, the vertical member 1
If the bolts 7a arranged at four locations b and 1f are adjusted to have different screw-in lengths, the number of weir plates can be increased or decreased from the bottom to the top, or the shape of the weir plates can be changed to change the shape of the concrete structure. Even if the shape is changed, the dam plate can be supported by the support work.

Furthermore, the barrier plate 9 is a transparent FRP.
A flange 9a formed of a plate or the like and bent at the upper and lower ends toward a surface contacting with concrete (Fig. 3 (a)
(See FIG. 2), and a bolt hole (not shown) is formed in the flange 9a. The weir plate 9 is temporarily fixed by connecting the flange 9a with a bolt or the like. Here, such flanges 9a and bolts have the effect of strengthening the adhesion between the concrete and the dam plate 9 and promoting integration, and
In order to strengthen this integration, a plurality of studs 9b as shown in FIGS. 3 (a) and 4 (a), (b) may be provided on the surface of the dam plate 9 that contacts the concrete.

A hydraulic jack 3 is fixed to the center of a connecting member 2b of the supporting and supporting unit 10 having the above-described structure. This hydraulic jack 3 is used for the concrete structure 3
The supporting unit 10 is raised by applying a reaction force to the reaction force rod 4 made of a steel rod buried in 0.

The scaffolds 20, 21, of the upper, middle, and lower three steps are
As shown in FIG. 1, 22 may be provided from the first supporting structure 1, and in FIG. 1, although it is provided only on one side of the first supporting structure 1, both sides of the first supporting structure 1 are provided. It may be provided in.

A supporting work slide construction method using the supporting work unit having the above structure will be described below.

The reaction force rod 4 is embedded in the concrete structure 30, and the support unit 10 is installed so that the reaction force rod 4 passes through the hydraulic jack 3.

Next, the reinforcing bar 5 is built on the concrete structure 30, and the dam plate 9 is further built on the outer periphery of the reinforcing bar 5. At this time, the weir plate 9 and the lower weir plate, the flange 9
a) Butt each other and fasten them with bolts or wire. The sliding member (the plate 11 or the roller 24) of the second supporting work is brought into contact with the weir plate 9 thus built in, and the bolt 7a of the adjusting device 7 is used to support the sliding member (plate 11 or roller 24).
Adjust by tightening or loosening.

After the adjustment of the adjusting device 7 is completed, concrete is poured into the portion surrounded by the dam plate 9. At the time of this placement, the filling state of concrete is visually confirmed from the outside of the seepage barrier plate 9, and if voids or the like are mixed in the concrete, they are removed by a vibrator or the like. When the placed concrete is hardened to a compressive strength of 3 to 5 kg / cm ² , the hydraulic jack 3 is used to support the support unit 1.
When an upward force is applied to 0, the second supporting member 6 slides on the surface of the dam plate 9 by its sliding member (the plate body 11 or the roller 24), while the dam plate 9 of the concrete structure 30 is slid. The supporting unit 10 is left in a state of being buried in the surface and rises. At this time, the concrete and the dam plate 9 are the flange 9a and the stud 9a formed on the surface of the dam plate.
The mutual adhesion is strengthened by and is integrated to form the concrete structure 30. After that, the concrete structure 30 is completed by repeating the same steps as described above.

[0025]

According to the support slide construction method of the present invention, unlike the conventional sliding formwork method, the weir plate adhering to the concrete is resisted against the concrete adhering force and does not rise in the adhering state as it is. It is also good to embed the weir plate integrally with the concrete structure and raise the supporting unit while sliding on the weir plate with a sliding member, so that the raising resistance at this time can be reduced and the concrete surface is disturbed. It is possible to raise the supporting unit without moving. Therefore, it is possible to form a concrete structure having a clean surface finish, and a large-scale jack device is not required for raising the supporting unit, so that the device can be simplified.

Further, in the supporting slide method of the present invention,
Since a see-through plate is used as the weir plate, it is possible to visually inspect the filling condition of the concrete placed inside the weir plate, and even if voids or the like are mixed in the concrete,
This can be immediately removed by a vibrator or the like.

Further, since the concrete inside can be protected by the stable dam of high quality, the durability of the concrete structure is improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view for explaining a supporting slide method of the present invention.

FIG. 2 is a front view of the supporting unit when FIG. 1 is viewed from the direction of a one-dot chain line II-II.

FIG. 3 (a) is an enlarged sectional view of a dotted line portion III in FIG.
(b) is an enlarged view of the tip of the adjusting device of (a).

4A is an enlarged side view of a sliding member different from FIG. 3, and FIG. 4B is a plan view of FIG.

[Explanation of symbols]

 1 First support 5 Rebar 6 Second support 9 Weir plate 10 Support unit (support) 11,24 Sliding member 30 Concrete structure (precast concrete body)

Claims (2)

[Claims] 1. A reinforcing bar and / or a steel frame is built, a weir plate is arranged on the outer periphery of the reinforcing bar and / or the steel frame, and the weir plate is supported by the supporting work via a sliding member and surrounded by the weir plate. After placing concrete on the damaged part and hardening the concrete to the extent that it has the required compressive strength, leave the weir plate embedded on the surface of the hardened concrete body and raise the supporting work. After that, a supporting slide construction method is characterized in that the same steps as above are repeated on the hardened concrete body. 2. The supporting slide construction method according to claim 1, further comprising the step of visually inspecting a filling state of concrete cast inside the dam plate, using a transparent plate as the dam plate.