JPH0623505B2 - Formwork device for making concrete slab with beams - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a formwork apparatus for producing a concrete slab in a state where a steel beam is joined by an upper flange thereof, and more specifically, a lower surface of the concrete slab. In the formwork for forming, forming an opening for the steel frame beam to be joined to the concrete slab with the upper flange to descend into the joint, and the upper flange of the steel beam located at the joint and both sides of this The present invention relates to a formwork device for producing a concrete slab with a beam, which is provided with a sub-formwork for closing a gap between the formwork located at the bottom and an opening peripheral edge.

[Conventional technology]

In such a formwork device, generally, the opening of the formwork is generally used for facilitating the downward movement into the joint of the steel beam and the upward movement from the joint after lifting the entire slab. Is formed wider than the flange of the steel beam, and as a result, a gap is formed between the upper flange of the steel beam and the opening peripheral edge of the mold. In particular, in the case of a steel frame beam in which the upper flange is made narrower than the lower flange, paying attention to the fact that the strength required for the upper flange is smaller than the strength required for the flange due to the presence of the concrete slab. The above-mentioned gap becomes large. Therefore, a sub formwork is required to close down the above-mentioned gap after the steel beam is moved down into the joint.

Then, in the conventional formwork apparatus, the subformwork is detachable from the formwork, the steel beam or the like via bolts or the like,
The mounting of the sub-formula closes the gap, and the removal of the sub-formula widens the opening width.

[Problems to be solved by the invention]

However, in the case of the above-mentioned conventional formwork apparatus, work for attaching and detaching the sub-formwork is required. In particular, if the sub-form is mounted on the form, the lower flange width of the steel beam is larger than the upper flange width when the sub-form is mounted and the steel beam is moved up by lifting the whole body after curing / curing. If larger,
If the sub formwork is still attached, the lower flange hits the sub formwork, and the steel frame beam cannot be moved up and out. As a result, it is necessary to go under the formwork and remove the sub formwork.
Of course, if the upper flange width and the lower flange width of the steel beam are the same, it is not possible to move the steel beam up while the sub-frame is still attached, but when passing through the lower flange, the lower flange and the sub-framework Since there is no room between and, the sub formwork is removed in order to facilitate and ensure the upward movement of the steel beam.

In short, in the conventional formwork apparatus, a decrease in workability due to the subformwork is unavoidable.

An object of the present invention is to provide a formwork device capable of producing a concrete slab with a beam with good workability.

[Means for solving problems]

A characteristic configuration of a formwork apparatus for making a concrete slab with a beam according to the present invention is that the subformwork is swingably mounted at a gap closing position and a retracted position on the formwork, and is attached to the subformwork. A first operation portion that is pressed by a lower flange of the steel beam that moves down into the joint and receives a swinging force to a gap closing position, and a retracted position that is pressed by a lower flange of the steel beam that rises out of the joint The second operation portion that receives the swinging force to the is connected to the second operation portion. The actions and effects of it are as follows.

[Work]

When the steel beam is moved down to the joint, the lower flange of the steel beam presses the first operation part and the sub-framework automatically changes to the gap closing position, curing the concrete slab, and lifting the whole after hardening. When the steel beam is moved up from the joint, the lower flange of the steel beam pushes the second operating part and automatically changes to the sub form or the retracted position. It is unnecessary. Moreover, since the sub-framework is repositioned by lowering and raising the steel beam, a special actuator such as a cylinder for repositioning the sub-framework is unnecessary.

〔The invention's effect〕

Therefore, the present invention provides a sub formwork, and even if the lower flange width of the steel beam is larger than the upper flange width, the steel frame beam is moved downward to the joint portion and moved upward from the joint portion. The mold for the concrete slab with beams that can be manufactured at low cost by making it possible to create a concrete slab with a beam with good workability by preventing the workability from deteriorating due to the sub-framework, while making it easier and more reliable. A frame device can be provided.

〔Example〕

 Next, an embodiment of the present invention will be described with reference to the drawings.

As shown in Fig. 3, a concrete slab with a beam integrated structure in which steel beams (A) using H-section steel are joined near both ends in the width direction at their upper flanges (Aa) via stud dowels (B). A formwork device for producing (C), which comprises a horizontal formwork (1) for forming the lower surface of the concrete slab (C) and the concrete slab (C).
It is equipped with a vertical side surface formwork (2) for forming the side surface of the.

As shown in FIG. 2, the formwork (1) is formed with an opening (1A) for moving the steel frame beam (A) down into the joint, and the width (l ₁ ) And the upper flange of the steel beam (A)
Width of (Aa) (l _2), the width of the lower flange (Ab) (l ₃₎ is _{l 1> l 3> l 2} .

In addition, as shown in FIG. 1 and FIG. 2, the formwork device includes an upper flange (Aa) of the steel beam (A) located at the joint and a formwork (1) located on both sides of the upper flange (Aa). Sub formwork (3) that closes the gap (d) with the peripheral edge of the opening, and two pairs of guides (4) that guide the elevating and lowering of the joint through the opening (1A) of the steel beam (A)
Is equipped with.

The sub formwork (3) includes a weir plate portion (3A) and this weir plate portion (3A).
Consists of a bracket (3B) for attaching the to the formwork (1),
Mounting the bracket (3B) to the formwork (1) Steel frame at the base end
By swinging about the axis (X) parallel to (A), the gap closing position and the retracted position on the form (1) are configured to change, and the gap closing position It is stable at the retracted position.

The means for stabilizing the sub formwork (3) at the gap closing position and the retracted position is such that the center of gravity (g) of the sub formwork (3) is opened more than the swing axis (X) at the gap closing position. On the side of (1A), in the retracted position, it is located farther from the swing axis (X), so that the sub formwork (3) is contacted by the weight of the upper surface of the formwork (1) by its own weight. Stable holding in the retracted position by contact, the formwork (1)
It is a means for holding the stopper (5) attached to the base plate by its own weight in a stable manner at the gap closing position.

The weir plate portion (3A) is a steel beam (A) at the gap closing position.
At the end of the upper flange (Aa) at
Is to block.

In the retreat position, the bracket (3B) is in the ascending and descending path of the lower flange (Ab) so that the lower flange (Ab) of the steel frame beam (A) moving down receives the swinging force to the gap closing position in the retracted position. At the gap closing position, the first operation part (6) is pushed out of the ascending / descending path at the gap closing position, and at the gap closing position, it is pushed by the lower flange (Ab) of the steel beam (A) moving upward to move to the retracted position. A second operation portion (7) is provided so as to project to the ascending / descending path of the lower flange (Ab) so as to receive the swinging force and to retreat outside the ascending / descending path at the retracted position.

As shown in FIGS. 4 and 5, the guide (4) is provided with a support post.
In (4A), insert a guide piece (Ad) connected to the wave (Ac) of the steel beam (A) from above to position the steel beam (A) in the slab width direction for coarse adjustment. Secondary slit for fine adjustment that positions the primary slit (4B) and the guide piece (Ad) that passed through this primary slit (4B) from above to position the steel beam (A) in the slab width direction. Slits (4C) are formed, and the guide (4) guides the steel beam (A) to its set position in the longitudinal direction by sliding one end of the wave (Ac) in the steel beam (A). It has a cam surface (4D).

Each of the primary and secondary slits (4B) and (4C) is formed with the guide members (4a) and (4b) facing each other in a parallel posture at intervals in the slab width direction. . Of course, the secondary slit (4C) is the primary slit (4B)
It is formed narrower than the
The upper end portion for insertion of B) and (4C) is configured to be wider as it goes upward.

Further, among the side formwork (2), those facing each other in the width direction of the slab have a structure in which when concrete slabs with beams (C) are juxtaposed in the width direction of the slab, as shown in FIG. A space (E) for welding the connecting plate (D) to the upper surfaces of both upper flanges (Aa) to connect the adjacent steel beams (A) of the concrete slab (C) to the concrete slab with beams (C). A protruding portion to be formed is formed.

In addition, the steel slab (A) penetrates the concrete slab (C) and is tightened with bolts (F) in a posture along the slab width direction at intervals in the longitudinal direction of the slab (C). A nut member (H) is fixedly connected to the two wire hanging bars (G) for lifting which are arranged above.

The procedure for making a concrete slab (C) with a beam using the formwork apparatus configured as described above is shown below.

Set the formwork (1), the guide (4) and the side formwork (2), and attach the sub formwork (3) to the formwork (1).

 Swing the subform (3) to the retracted position.

A steel frame beam (A) with a stud vegil (B) and a nut member (H) is hung by a crane or the like and moved down along the guide (4) to the joint. At this time, the first operating portion (6) is pressed by the lower flange (Ab) that is moved downward, and the sub formwork (3) automatically changes to the gap closing position as shown in FIGS. 7 to 11. .

Reinforcing work is carried out by suspending the preassembled rebar (J) on the formwork (1), subformwork (3), and steel beam (A) by using a crane and placing it.

After placing concrete and shaping the upper surface, it is cured and hardened. In this case, it is desirable to cover with a sheet.

When the concrete is cured and hardened to withstand hanging, attach a wire hanging bar (G), lift it with a crane, etc., and transfer it to a storage location. The second operating part (7) is pressed by the lower flange (Ab) that rises and moves with this lifting, and the sub formwork (3) swings to the retracted position as shown in FIGS. 12 to 14. To do.

 The subsequent steps are repeated from.

The above formwork equipment is a concrete slab with beams (C).
If it is large, it will be installed at or near a part of the construction site.

[Another embodiment]

 Another embodiment of the present invention will be described below.

As shown in FIGS. 15 and 16, the sub formwork (3) is positioned in the middle of swinging to form a means for stabilizing the sub formwork (3) at the gap closing position and the retracted position. At this time, the tension spring (8) is suspended over the portions of the sub-formwork (3) and the formwork (1) which are located on a straight line passing through the swing axis (X). In other words, the subformwork (3) is pulled to the retracted position by the abutment of the tension spring (8) on the top surface of the formwork (1) and the tension (8) is applied to the stopper (5). It is configured to be stably held at the gap closing position by abutting with force.

When the steel beam (A) is moved up, be sure to use the sub formwork.
The sub formwork (3) is urged to the retracted position by a spring or gravity so that the (3) becomes the retracted position.

In the above embodiment, the concrete slab (C) having two steel beams (A) is shown, but of course,
The present invention can also be applied to a concrete slab (C) having three or more steel beams (A).

[Brief description of drawings]

1 to 14 show an embodiment of a formwork apparatus for producing a concrete slab with a beam according to the present invention. FIGS. 1 and 2 are vertical sectional front views of essential parts, and FIG. 3 is a concrete with a beam. Partially cutaway perspective view of the slab, FIG. 4 is a vertical sectional side view, FIG. 5 is a front view of essential parts, FIG. 6 is a vertical sectional front view of essential parts of the slab, and FIGS. Is. FIG. 15 and FIG. 16 are vertical front views of essential parts showing another embodiment of the present invention. (C) …… Concrete slab, (1) …… Formwork, (Aa) ……
Upper flange, (A) …… Steel beam, (1A) …… Opening, (3) ……
Sub formwork, (Ab) …… Lower flange, (6) …… First operation part,
(7) …… Second operation part, (8) …… Tension spring.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuhiko Sugimoto 4-27, Honmachi, Higashi-ku, Osaka City, Osaka Stock Company Takenaka Corporation Osaka Main Store (72) Inventor Tadashi Yamaguchi 4-27, Honmachi, Higashi-ku, Osaka Takenaka Corporation Osaka Main Store (72) Inventor Noboru Okino 4-27, Honmachi, Higashi-ku, Osaka City, Osaka Stock Company Takenaka Corporation Osaka Main Store (72) Inventor Tetsuro Kaji 3-6 Nihonbashi, Chuo-ku, Tokyo Asahi Kikai Co., Ltd.

Claims (4)

[Claims] 1. A steel frame beam (A) to be joined to the concrete slab (C) with an upper flange (Aa) is moved down into the formwork (1) for forming the lower surface of the concrete slab (C). To form the opening (1A) for closing the gap between the upper flange (Aa) of the steel beam (A) located at the joint and the peripheral edges of the formwork (1) located on both sides of the upper flange (Aa). A formwork device for making a concrete slab with a beam provided with a subformwork (3), wherein the subformwork (3) is swung between a gap closing position and a retracted position on the formwork (1). A first operation in which the sub-frame (3) is movably mounted and is pressed by the lower flange (Ab) of the steel beam (A) that moves down into the joint to receive the swinging force to the gap closing position. The part (6) and the second operating part (7), which is pressed by the lower flange (Ab) of the steel beam (A) rising out of the joint and receives the swinging force to the retracted position, are connected to each other. Formwork device for creating with concrete slabs. 2. A formwork apparatus for making a concrete slab with a beam according to claim 1, wherein the sub-formwork (3) is stable at a gap closing position and a retracted position, respectively. 3. A means for stabilizing the sub-formwork (3) at a gap closing position and a retracted position is such that the center of gravity of the sub-formwork (3) is located at a position close to the swing axis (X) at the gap closing position. A mold for making a concrete slab with a beam according to claim 1, which is a means for arranging on the opening (1A) side, in the retracted position, on a side farther from the opening (1A) than the swing axis (X). Frame device. 4. A means for stabilizing the sub-formwork (3) at the gap closing position and the retracted position, when the sub-formwork (3) is positioned in the swinging middle, the sub-formwork (3) and the mold A tension spring spans between the parts that are located on a straight line passing through the swing axis (X) with the frame (1).
The formwork apparatus for producing a concrete slab with a beam according to claim 1, which is a means for hanging (8).