JPH07107330B2 - Construction method of steel reinforced concrete columns - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for constructing a steel-framed reinforced concrete column.

(Prior art) Conventionally, in this type of construction, after the construction of the pillar steel frame and the reinforcement of the pillar rebar have been completed, a dam plate made of veneer plywood, etc., on the outer shell of the pillar, and a cauldron, timber, mold clamping The pillar formwork was assembled with metal fittings and the concrete was placed.

(Problems to be Solved by the Invention) The column formwork was assembled by a professional formwork carpenter, but in recent years, the number of formwork carpenters has drastically decreased, which is one of the major factors of cost up and construction period delay.

The present invention has been proposed in view of such circumstances, and provides a method for constructing a steel-framed reinforced concrete column in which the mold can be easily assembled even by a non-professional person, the construction cost is reduced, and the construction period is prevented from being delayed. There is a point to do.

(Means for Solving the Problem) In order to achieve the above-mentioned object, a construction method of a steel-framed reinforced concrete column according to the present invention is a method of constructing a column steel frame in a steel-framed reinforced concrete column A band frame is arranged at predetermined intervals in the height direction, and then a flexible tube foam having airtightness is attached to the outer circumference of each band frame so as to be detachably attached, and air is press-fitted into the tube foam. Then, the mold is molded, and then concrete is placed in the tube foam.

Chubufoam used in the construction method of the steel-framed reinforced concrete column, the kamaboko type elastic bag body is arranged vertically and horizontally on the sheet substrate, and the distribution pipe is connected between the adjacent bag bodies, and in the same bag body. A compressed air supply valve may be provided and configured.

Further, in the present invention, when the flexible tube form is attached to the band frame attached to the outer portion of the steel column, the tube pieces are attached to the tube frame between the tongue pieces provided at opposite ends of the tube pieces. Is bonded with fasteners to prevent the cement paste from wrapping around.

(Operation) According to the present invention, as described above, after the erection of the column steel frame and the reinforcement of the column reinforcing bars are completed, the band supporting frames arranged at predetermined intervals in the height direction in the column outer peripheral portion are formed into the form supporting member. As a flexible type, the flexible tube surrounds the strip frame and is detachably attached to the tube frame. The tube frame is expanded by pressurizing compressed air into the tube frame to form a mold, thus forming a columnar shape formed by the tube foam. The pillar concrete is placed in the frame.

Thus, after the cast concrete is hardened, the air in the tube form is evacuated, removed from the strip frame, and demolded.

(Examples) The present invention will be described below with reference to illustrated examples.

After the erection of the pillar steel frame (1) and the reinforcement of the pillar reinforcing bars (2) are completed, the band frames (3) are arranged at predetermined intervals in the height direction in the column outer portion, and the band frame supporting members (4 ) And a belt-frame supporting diagonal member (5), and is attached to a pillar steel frame (1).

Then, the band frame (3) is embraced by the left and right tube tubes (6) and detachably fixed to the band frame (3) by the bolts (7).

The tube form (6) is a polymer sheet substrate (6a) in which a kamaboko-shaped bag (6b) is arranged in a horizontal direction, and the strips are arranged in a vertical direction. A flow pipe (6c) is connected between (6b) and a compressed air supply valve (6d) is arranged in the bag body (6b). Further, tongue pieces (8) are attached to the joint edges of the left and right tube hoods (6), and the tongue pieces (8) are attached to the fastener (9).
To prevent the cement paste from flowing around from the joint portion of the tube foam (6).

The uppermost tube form (6 ') is for adjusting the height of the pillar formwork.

Next, an opening stopper (10) is attached to the column base, compressed air is press-fitted from the compressed air supply valve (6d) in the tube form (6), and each bag (6b) is inserted into each bag (6b) through the flow pipe (6c). Compressed air is enclosed and expanded to form a mold, and the compressed air supply valve (6d) is closed.

Next, concrete is poured into the pillar formwork constituted by the tube form (6).

1 to 2 hours after concrete is placed, the Fusner (9)
After the portion of the cement paste is washed away and the concrete is hardened, air is removed from the tube foam (6), the fastener (9) is opened, and the bolt (7) is removed to disassemble the tube foam.

The dismantled tube cube (6) is diverted to other construction parts.

The beam (11) in the figure is a beam.

(Effect of the invention) According to the present invention, as described above, after completing the erection of the column steel frame and the reinforcement of the column reinforcement, band frames are installed at predetermined intervals over the height direction in the column outer portion, and the airtightness is obtained. A flexible tube tube is attached around the outer circumference of the band frame so that it can be detachably attached to the band box, and then the tube tube is assembled by pressurizing air into the tube tube to form the box frame. It is what is done.

Further, after the cast concrete for the pillar form is hardened, the column form is demolded by removing air from the tube form and removing it from the band form.

As described above, according to the present invention, the pillar formwork can be easily assembled and disassembled even by a non-professional person, and the construction cost can be reduced and the construction period can be shortened.

Further, the flexible tube form is applied to the construction of a steel-framed reinforced concrete column having an arbitrary cross section, can be diverted, and is lightweight and foldable, so that it can be easily transported and handled.

Furthermore, by constructing the tube form from a transparent material, concrete pouring management can be facilitated.

According to a second aspect of the present invention, elastic sheet bodies of the kamaboko type are arranged vertically and horizontally on a sheet substrate, a flow pipe is connected between adjacent bag bodies, and a compressed air supply valve is provided in the bag bodies. By configuring the tube form, the tube form is attached to the band frame, compressed air is press-fitted from the compressed air supply valve, and compressed air is sealed in each bag through the flow pipe. It is inflated to form a pillar form, and the bag body and the flow pipe into which compressed air is press-fitted at this time function as a stiffening material for the tube form.

According to a third aspect of the present invention, the band frame attached to the outer shell of the steel column is hugged by the left and right tube tubes, and the tongues provided at the opposite ends of the tube tubes are joined by fasteners. This prevents the cement paste from wrapping around at the joint portion of the tube form.

[Brief description of drawings]

1 and 2 are a front view and a cross-sectional plan view showing an implementation state of an embodiment of a method for constructing a steel-framed reinforced concrete column according to the present invention, and FIG. 3 is a partial front view of a chew hood, and FIG.
The drawing is a partial cross-sectional plan view thereof, FIG. 5 is a cross-sectional plan view showing an attachment portion to the band frame, and FIG. 6 is a cross-sectional plan view showing a joint portion of a tube form. (1) …… Column steel frame, (2) …… Column steel bar, (3) …… Band frame, (6) …… Chubu form, (6b) …… Bag,
(6c) …… Flow pipe, (6d) …… Compressed air supply valve, (7)
... Bolt, (8) ... tongue, (9) ... Fuassner.

Claims (3)

[Claims] 1. After completion of erection of column steel frames and arrangement of column reinforcing bars in steel reinforced concrete columns, band frames are arranged at predetermined intervals in the height direction on the column outer portion, and then on the outer periphery of each band frame. Characterized in that the flexible tube having airtightness is surrounded and removably attached, air is pressed into the tube to form a mold, and then concrete is placed in the tube. Construction method of steel-framed reinforced concrete columns. 2. In the tube form, a kamaboko-shaped elastic bag body is vertically and horizontally arranged on a sheet substrate, a flow pipe is connected between the adjacent bag bodies, and a compressed air supply valve is provided in the bag body. The method for constructing a steel-framed reinforced concrete column according to claim 1, which is arranged. 3. A band frame attached to the outer portion of the steel column is embraced by the left and right tube tubes, and the tongue pieces provided at opposite ends of the tube tubes are joined by fasteners. The method for constructing a steel-framed reinforced concrete column according to 1.