JP2568051B2 - Concrete pillar manufacturing method and apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a plurality of prestressed concrete columns at once.

[0002]

2. Description of the Related Art Conventionally, in the manufacture of prestressed concrete columns, a tension wire is connected between joint flanges at both ends, and the tension wire is towed by a jack in the formwork to rotate the formwork in a tensioned state. Since it was manufactured by putting ready-mixed concrete in the frame and introducing tension after hardening, it was necessary to manufacture each concrete column. This has a problem that it is difficult to improve the manufacturing efficiency and is not suitable for mass production.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to manufacture a plurality of prestressed concrete columns by using the above prestressed concrete columns with a long form on a common center line and pulling a tension line with one jack. .

[0004]

In order to achieve the above object, the present invention forms a plurality of rebar cages by connecting both ends of a tension wire to a joint flange with a reinforcing band, and connects the plurality of rebar cages to the tension wire. Connect the above-mentioned joint flanges arranged in a row in a row and facing each other with bolts, accommodate these multiple connection rebar cages in a rotary formwork, and support one end of the above-mentioned joint flange at one end of the formwork. Then, the tension line is pulled to the outer surface of the other joint flange at the other end through a jig to the other of the formwork, and the movement of the intermediate connection joint flange due to the traction is caused by the reinforcement bands on both sides of the connection joint flange. The concrete column manufacturing method characterized in that a plurality of concrete columns are manufactured at one time by centrifugal compaction using the above-mentioned mold, which is carried out in the internal space of the knot that connects the mold contacting the outer surface of The reinforcement band Arranging a plurality of rebar cages connected to the attached joint flange in a row in the direction of the tension line, connecting the joint flanges facing each other with bolts, and accommodating these multi-connector rebar cages in the rotary formwork, One end of the joint flange is supported at one end of the mold, and the tension line is formed on the outer surface of the other end of the joint flange via a jig so as to be pulled to the other of the mold. The concrete column manufacturing apparatus is characterized in that the intermediate connecting joint flange is moved in association with the pulling in the internal space of the node connecting the forms contacting the outer surfaces of the reinforcing bands on both sides of the connecting joint flange.

[0005]

[Function] When accommodating a plurality of rebar cages connected in a straight line in a plurality of rotary formwork connected in a straight line, a joint flange in which heads are engaged and connected to both ends of the tension line forming the rebar cage Is provided, and the reinforcing bands provided on both sides of the connecting joint flanges of the reinforcing bar baskets that are aligned with each other are housed inside the connecting joints of the rotary formwork.

The tension wires of the plurality of rebar cages are connected in a straight line via the connection joint flange. When the other end of the joint flange is pulled through the jig to the other, the one end of the joint flange is caught at one end of the rotary form and the tension line is pulled, and the tension force is generated in the tension line. Occurs.

In this state, the inclusion (set ring) interposed between the rotary mold and the traction device is removed, and the tension force is held at the extreme ends of the mold.

Since the abutting joint flange interposed between the tension lines is projected outward from the reinforcing band, it is moved to the other side by the pulling to the other side, but the movement amount is the same as that of the reinforcing band on both sides of the connecting joint flange. The connecting joint flange does not interfere with the inner surface of the joint by moving in the space s inside the joint that connects the rotary form that contacts the outer surface. Moves to the other side without interfering with the knot and the tension line is evenly tensioned over the entire length.

In this state, the rotary form is placed on the two rotating wheels, the form is rotated at high speed in accordance with the rotation of the rotating wheels, and fresh concrete is poured from one of the forms to give a centrifugal force to the concrete. It is compacted in a mold and cured and cured. Then, the concrete hardened by demolding the formwork, the pulling force (tensioning force) is introduced into the concrete at once by removing the set ring of the jig between the joint flanges at both ends, Multiple concrete columns are formed at once. After that, the connection joint flange can be separated to separately manufacture a plurality of prestressed concrete columns having joint flanges at both ends.

[0010]

EXAMPLE Both ends of a plurality of tension lines 1 arranged in a circle are connected to a joint flange 3 to which a reinforcing band 2 is welded to form a plurality of reinforcing bar cages 1 '. At both ends of the tension wire 1, the head portion 1 "is inserted into and engaged with the enlarged diameter recess 9'formed at the outer end portion of the through hole 9 formed in the joint flange 3, and as shown in FIG. The outer end surface of 3 is formed into a flat surface, and connecting bolt holes 4'are formed along the outer peripheral surface.

The rotary form 5 has a cylindrical shape, the inner diameter of which is made to coincide with the outer diameter of the reinforcing band 2, and the tip of the form 5 is located in the middle of the reinforcing band 2 so as not to come into contact with the joint flange 3 and spaced apart. Keep t (Fig. 2).

The units of the rebar cage 1'are arranged in a straight line so that the joint flanges 3 and 3 are brought into contact with each other and the bolts 4 are inserted into the connecting bolt holes 4'and 4'of both flanges 3 and 3 and tightened to make a straight line. A plurality of rebar cages 1'and 1'are integrally formed in the.

The plurality of rebar cages 1'and 1'support the rotary form 5 between the reinforcing bands 2 and 2, and an abutting joint is provided at both ends of the form 5 (keeping the distance t from the joint flange 3). A node 7 for accommodating the flanges 3, 3 is provided and the facing joint flange 3,
The rotary molds 5, 5 on both sides of 3 are integrally connected by the joint 7.

Then, one endmost joint flange 3 is brought into contact with and hooked (supported) on one endmost flange (one end 5 ') of the rotary formwork 5 (on the right side in FIG. 1), and the other endmost joint flange. 5 ″ (left side in FIG. 1) is connected to the hydraulic jack 10 via the jig 6.
1 is pulled by the jack 10 to the left side in FIG. 1, a gap is created between the left side flange 5 ″ of the mold 5 and the jig 6, and the tension line 1 is pulled and tensioned. The ring 11 (removable spacer) is inserted, the pulling by the jack 10 is stopped, and the jack 10 is removed from the jig 6.

The tension line 1 is pulled inside the rotary mold 5 and the joint 7, and in that state, the mold 5 and the joint 7 are placed on two rotating wheels and are rotated at a high speed in one direction, and at the same time, inside the mold 5. When ready-mixed concrete is poured, the concrete column 12 is hardened and formed on the inner surface of the form 5 over the entire length by the action of centrifugal force, but the reinforcing band 2 and the rotary form 5 are slidably and closely attached. Therefore, the fresh concrete does not enter the node 7.

When the hydraulic jack 10 is used for pulling, the tension line 1 extends in the pulling direction (left in FIG. 1), and the abutting joint flanges 3, 3 move slightly to the left, but the movement is within the space s due to the gap t. It stays and does not interfere with clause 7.

After hardening and curing, the rotary form 5 and the joint 7 are removed from the mold, so that the joint flanges 3 and 3 at both ends are hardened concrete 12.
The tension is held on the tension line 1 by being supported by both end surfaces of the two, and the tension is introduced into the tension line 1 between the both end joint flanges 3 and 3 of the unit concrete column 8 by further separating the contact joint flanges 3 and 3. The pre-stressed concrete column 8 is manufactured by maintaining the maintained state (FIG. 3).

[0018]

Since the present invention is based on the method and apparatus described above, a prestressed concrete column 8 having joint flanges 3 with reinforcing bands 2 at both ends is connected by one traction device and a joint 7 of a rotary formwork 5. It is possible to manufacture a plurality of pieces at a time, which improves the manufacturing efficiency and is suitable for mass production.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a concrete column manufacturing apparatus of the present invention.

FIG. 2 is a partially enlarged side view of FIG. 1;

FIG. 3 is a side view of a plurality of concrete columns.

FIG. 4 is an enlarged vertical sectional view of one end of a concrete column.

[Explanation of symbols]

 1 Tension line 1'Reinforcing bar cage 2 Reinforcing band 3 Joint flange 4 Bolt 5 Rotating formwork 5'One end 6 Jig 7 Section s Internal space 8 Concrete column

Claims (2)

(57) [Claims] 1. A plurality of reinforcing bar cages are formed by connecting both ends of a tension line to a joint flange with a reinforcing band, and the plurality of reinforcing bar cages are arranged in a line in the direction of the tension line and are in contact with each other. , The multi-connecting rebar cages are housed in a rotary formwork, one end of the joint flange is supported at one end of the formwork, and the other end of the joint flange is fixed to the outer surface of the joint flange. The tension line is pulled to the other side of the form via a tool, and the movement of the intermediate connection joint flange due to the pulling is moved in the inner space of the knot that connects the form contacting the outer surfaces of the reinforcing bands on both sides of the connection joint flange. A method for producing a concrete column, characterized in that a plurality of concrete columns are produced at one time by centrifugal compaction using the above mold. 2. A plurality of reinforcing bar cages, which are formed by connecting both ends of a tension wire to a joint flange with a reinforcing band, are arranged in a line in the direction of the tension wire, and the joint flanges that are in contact with each other are connected by bolts. The connecting rebar cage is housed in a rotary formwork, the one end of the joint flange is supported at one end of the formwork, and the tension line is attached to the outer surface of the other endmost joint flange via a jig. Is formed to be pulled to the other side of the formwork,
In addition, the concrete column manufacturing apparatus is characterized in that the intermediate connecting joint flange is moved along with the pulling in an internal space of a node that connects the molds in contact with the outer surfaces of the reinforcing bands on both sides of the connecting joint flange.